Buderus Logamax GB062-24 KDH V2 User manual

Only for authorized service

technician !

Service Manual

Gas Wallhung Boiler

Logamax Plus GB062

GB062 - 14....

GB062 - 24....

2017/01_PRM-M21_U. Demir

Content

Logamax Plus GB062

2

Content

1 Safety precautions and symbols . . . . . . . . . . . . . . . 3

1 Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

1.1 Safety precautions . . . . . . . . . . . . . . . . . . . . . 3

2 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

2.1 Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

2.2 Before commissioning . . . . . . . . . . . . . . . . . . 4

2.3 Switching the appliance on/off . . . . . . . . . . . . 4

2.4 Setting the maximum flow temperature . . . . . 5

2.5 Setting the DHW temperature . . . . . . . . . . . . 5

2.6 Setting summer mode . . . . . . . . . . . . . . . . . . 5

2.7 Short operating overview . . . . . . . . . . . . . . . . 6

2.8 Product Type Description . . . . . . . . . . . . . . . . 6

3 Service menu settings . . . . . . . . . . . . . . . . . . . . . . . . 7

3.1 Operating the service menu . . . . . . . . . . . . . . 7

3.2 Service functions overview . . . . . . . . . . . . . . . 8

3.2.1 Menu 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

3.2.2 Menu 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

3.2.3 Menu 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

4 Fault finding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

4.1 Explanations of faults table . . . . . . . . . . . . . 15

4.2 Fault group definition . . . . . . . . . . . . . . . . . . 15

4.3 Faults and possible remedy steps . . . . . . . . 17

4.4 Faults that are not shown on the display . . . 40

5 Electrical values, gas conversion and boiler layout

41

5.1 Sensor (NTC) Values . . . . . . . . . . . . . . . . . . 41

5.1.1 Domestic hot water temperature Sensor . . . 41

5.1.2 Central Heating Flow Temperature Sensor,

Storage Tank Temperature Sensor . . . . . . . 41

5.1.3 Outdoor Temperature Sensor (7.747.026.229)

41

5.2 Gas conversion steps . . . . . . . . . . . . . . . . . . 42

5.3 Condens 2500W / CerapurCompact . . . . . . 43

5.3.1 GB062-24K.... . . . . . . . . . . . . . . . . . . . . . . . 43

5.3.2 Electrical values . . . . . . . . . . . . . . . . . . . . . . 44

6 Inspection and maintanance . . . . . . . . . . . . . . . . . 46

6.1 Safety instructions for inspection and

maintenance . . . . . . . . . . . . . . . . . . . . . . . . 46

6.2 Check the heat exchanger . . . . . . . . . . . . . . 47

6.3 Check the electrodes and clean the heat

exchanger . . . . . . . . . . . . . . . . . . . . . . . . . . 47

6.4 Cleaning condensate trap . . . . . . . . . . . . . . 49

6.5 Check diaphragm (flue gas non-return device) in

the mixer unit . . . . . . . . . . . . . . . . . . . . . . . . 49

6.6 Checking the strainer in the cold water pipe 50

6.7 GB062..K.. (Combi) appliances: Check the plate

heat exchanger . . . . . . . . . . . . . . . . . . . . . . 50

6.8 Checking the expansion vessel . . . . . . . . . 50

6.9 Setting the heating system operating pressure

50

6.10 Removing automatic air vent valve . . . . . . . 51

6.11 Checking the gas valve . . . . . . . . . . . . . . . 51

6.12 Removing the gas valve . . . . . . . . . . . . . . . 51

6.13 Remove the heating pump . . . . . . . . . . . . . 52

6.14 Removing the motor of the 3-way valve . . . 52

6.15 Remove the heat exchanger . . . . . . . . . . . 52

7 Good to know . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

7.1 Integrated Weather Dependet Function (WDC) -

Heat curve . . . . . . . . . . . . . . . . . . . . . . . . . . 53

7.2 Boiler Frost protection . . . . . . . . . . . . . . . . 53

7.3 Air purging in central heating mode . . . . . . 53

7.4 Air Pressure Switch (APS) . . . . . . . . . . . . . 53

8 Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54

8.1 Mixing unit . . . . . . . . . . . . . . . . . . . . . . . . . 54

8.2 Resonator & Burner . . . . . . . . . . . . . . . . . . 54

8.3 Venturi . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55

8.4 Circulation Pump (ErP pump) . . . . . . . . . . . 56

1

Safety precautions and symbols

Logamax PLus GB062

3

1 Safety precautions and symbols

1 Symbols

Signal words indicate the seriousness of the hazard in terms

of the consequences of not following the safety instructions.

• Caution indicates that minor damage to property could

result.

• Warning indicates that minor personal injury or serious

damage to property could result.

• Danger indicates that serious personal injury could

result. In particularly serious cases, lives could be at

risk.

Notes contain important information in cases where there is

no risk of personal injury or damage to property.

1.1 Safety precautions

If you smell gas

B Turn off gas service cook.

B Open windows.

B Do not operate any electrical switches.

B Extinguish any naked flames.

B Leave the building and telephone the gas company and

authorized dealer from an outside phone.

If you smell fumes from the appliance

B Switch off the appliance.

B Open windows and doors.

B Inform your heating engineer.

Fitting and Modifications

B Fitting of the appliance or many modifications to be appli-

ance may only be carried out by a compotent perEND.

B Flue systens must not be modified in any way.

B If the appliance has a type B.. flue system : Ventilation

openings in doors, windows and walls must not be sealed

or restricted. If draught-proof windows are installed, meas-

ures must be taken to ensure there is an adequate supply

of air to the appliance for combustion.

Inspection / Maintenance

B We recommend take out a to have the system regulary

serviced in order to ensure that it functions reliably and

safely.

B Only use original spare parts.

Combustible materials

B Do not store or use any combustible materials (paper, thin-

ners, paints etc.) in the vicinty of the appliance.

Combustion Air / Ambient Air

B Keep combustion air/ambient air free of corrosive sub-

stances (e. g. halogenated hydrocarbons which contain

chlorine or fluorine compounds). In this way corrosion can

be prevented.

Instructions to the customer

B Explain to the customer how the appliance works and how

to operate it.

B Advise the customer that he / she must not make any mod-

ifications to the appliance or carry out any repairs on it.

Safety instructions in this document are identi-

fied by a warning-triangle symbol and are print-

ed on a grey background.

Notes are identified by the symbol shown on

the left. They are bordered by horizontal lines

above and below the text.

2

Operation

Logamax Plus GB062

4

2Operation

Fig. 1 Hydraulic connections

1 Siphon (condensation) Drain hose

2 Heating flow valve (accessory)

3 Domecti hot water qoutlet

4 Gas valve (closed) (accessory)

5 Drain hose

6 Cold water valve (accessory)

7 Heating return valve (accessory)

8 Filling valve

2.1 Display

Fig. 2 Display

1 Burner operation

2 Fault display/standby mode display

3 Heating mode active

4 DHW heating active

5 Summer mode active

6 Service Mode

7 Temperature display (in °C)

2.2 Before commissioning

B Adjust pre-charge pressure of expansion vessel to static

head of the heating system.

B Open the automatic air vent valve (leave open).

B Open all system radiator valves.

B Open the cold water valve.

B Open the cold water valve and one hot water tap until

water flows out.

B Open the heating flow valve and heating return valve.

B Fill the heating system to 1 - 2 bar and close the fill valve.

B Bleed radiators.

B Top up heating system to pressure of 1 - 2 bar.

B Check that the gas type specified on the type plate

matches that of the gas supply.

2.3 Switching the appliance on/off

Switching on

B Start the appliance at the standby key.

The display shows the heating water flow temperature.

Switching off/ standby mode

B Shut down the appliance at the standby key.

Only the warning symbol continues to be displayed.

B If the appliance is to be switched off for a longer period of

time: observe correct frost protection procedures.

Fig. 3

0 010 005 789-001

32

1

4 5 6 7

NOTICE: Commissioning without water will

destroy the appliance.

B Only operate the appliance once it has been

filled with water.

2

Operation

Logamax PLus GB062

5

2.4 Setting the maximum flow temperature

The maximum flow temperature can be set between 40 °C

and 82 °C. The current flow temperature is shown on the

display.

B Keep pressing – until the symbol appears on the

display.

B Press OK.

The set maximum flow temperature is displayed.

B Press + or – to set the required maximum flow

temperature.

B Press OK to save the setting.

The display shows the current flow temperature.

You can find typical maximum flow temperatures in tab.

1.

When the burner is active in heating mode, the symbol

and the burner symbol appear on the display.

2.5 Setting the DHW temperature

The DHW temperature can be set between 35 °C and

approx. 60 °C.

B Keep pressing – until the symbol appears on the

display.

B Press OK.

The set DHW temperature is displayed.

B Press + or – to set the required DHW temperature.

B Press OK to save the setting.

The display shows the current flow temperature.

B When the burner is active in DHW mode, the symbol

and the burner symbol appear.

2.6 Setting summer mode

The heating circuit pump and consequently central heating

are switched off. The DHW and power supply for the heating

control unit and timer are retained.

To set summer mode:

B Keep pressing – until the symbol appears on the

display.

B Press OK.

The set maximum flow temperature is displayed.

B Keep pressing – until ... appears on the display.

B Press OK to save the setting.

is permanently displayed.

Additional instructions are contained in the operating instruc-

tions for the heating programmer.

The appliance has an anti-seizing function

which prevents the heating circuit pump and the

3-way valve seizing up following long periods of

inactivity.

The anti-seizing function remains active during

standby mode.

When selecting .., heating mode is disabled

( appears on the display, summer mode).

Flow temperature Sample application

.. ( symbol appears) Summer mode

Approx. 75 °C Radiator heating system

82 °C Convector heating system

Tab. 1 Maximum flow temperature

NOTICE: Heating system at risk through frost. In

summer mode, only the appliance is protected

against frost.

B Observe frost protection measures where

there is a risk of frost.

2

Operation

Logamax Plus GB062

6

2.7 Short operating overview

Fig. 4 Short operating overview

2.8 Product Type Description

GB Wall mounted condensiing gas boiler

062 Segmen

24 Nominal CH output in kW (14, 20, 24, ...kW)

K Combi version

D Booster for DHW (e.g. 28 kW)

H Gas type (H = Natural Gas, L = LPG)

V2 Version2 : Energie Saving Pump

“IT” Country (e.g. Italy)

GB 062 - 24 K D H V2 IT

Tab. 2 Product type description

3

Service menu settings

Logamax PLus GB062

7

3 Service menu settings

3.1 Operating the service menu

The service menu enables the convenient adjustment and

checking of many appliance functions.

The service menu splits into three submenus:

• Menu 1, for setting level one service functions ( page 9)

• Menu 2, for setting level two service functions (page 12)

• Menu 3, for setting the appliance type and output

(page

14)

Selecting a service function

Calling up the service functions is different from one menu to

the next. For a description, see the beginning of each menu

overview.

B Calling up a menu:

– Menu 1 (‡page

8)

– Menu 2 (‡ page

12)

– Menu 3 (‡ page

14)

B Press + or – to scroll through the menu's service

functions.

Making a setting

B Press OK to switch to the service function.

The value flashes on the display.

B Press + or – to set the required value.

Saving a setting

B Hold down OK until the selected service function appears

on the display.

Exiting the service function without saving settings

B Press standby.

The boiler returns to standard mode.

Restoring values to standard setting

To restore all values from service levels 1 and 2 to their

default settings:

B Select service function 2.8.E in the second service menu

and save value 01. The appliance starts with the default

setting.

If you do not press a key for 15 minutes, the

service menu will be closed automatically.

3

Service menu settings

Logamax Plus GB062

8

3.2 Service functions overview

3.2.1 Menu 1

To call up a service function in this menu:

B Hold down “Back”, + and – at the same time until L.1 is

shown on the display.

B Press OK to make settings in menu 1.

B Press + or – to scroll through the menu's service

functions.

Service function Possible settings/display

1.A Maximum output for cental heat-

ing

Some gas supply utilities charge a basic rate based on output.

The output can be limited to the specific heat demand between the mini-

mum rated output and maximum rated output.

Default setting is the maximum rated output.

B Set the output in percent (%).

B Measure the gas flow rate and compare it with the information from

the setting tables. If they do not match, change the setting.

1.b Maximum output

(DHW)

The output can be limited to the specific heat demand between the mini-

mum rated output and maximum rated output.

Default setting is the maximum rated output for DHW.

B Set the DHW output in percent.

B Measure the gas flow rate and compare it with the information from

the setting tables. If they do not match, change the setting.

1.E Pump mode Pump mode (pump run while burner off)

0 = as mode 2, but automatic selection

of mode 4

if outdoor sensor detected

1 = off after pump overrun

2 = depends on room thermostat

3 = depends on outdoor control

2.b Maximum flow temperature The maximum flow temperature can be set to between 30 °C and 82 °C.

Default setting : 82.

2.C Venting function The venting function can be activated after maintenance.

The following settings are possible:

• 00: Venting function off

• 01: Venting function is switched on and after completion automatically

reset to 00

• 02: Permanent on.

Default setting : 00.

Tab. 3 Menu 1

3

Service menu settings

Logamax PLus GB062

9

2.d Thermal disinfection of the DHW

cylinder (System boiler)

• 0: Switched off

• 1: Switched on

This service function activates the heating of the DHW cylinder to 75 °C.

B Implement thermal disinfection as described.

Thermal disinfection will not be displayed.

Thermal disinfection terminates after the water has been held at

75 °C for 35 minutes.

2.F Operation Mode volatile With this service function, you can temporarily change the appliance

operating mode.

The following settings are possible:

• 0: Standard operation; the appliance runs according to controller

specifications.

• 1: The appliance runs for 15 minutes at the set minimum output. After

15 minutes, the appliance switches to standard mode.

• 2: The appliance runs for 15 minutes at maximum output. After

15 minutes, the appliance switches to standard mode.

Default setting : 0.

2.J Central heating / Storage tank

alternating mode (system boiler)

Anternating mode for 10 minutes betweens both mode.

Setting range: 0 - 1

Default setting : 0 minutes.

3.A Automatic ant-cycle mode 0 : 0ff, 1 : on (installation with weather depanded controls)

Default setting : 0

3.b Time interval for starting and

stopping (anti-cycle) the burner

(in CH mode)

The time interval determines the minimum delay between the burner

stop and restart (only active, if 3.A = 0).

Setting range: 1 to 10 minutes.

Default setting : 3 minutes.

3.C Temperature differential for

stopping and restarting the

burner (Hysterisis) (via CHNTC)

The temperature differential determines the level by which the flow tem-

perature must drop below the set flow temperature before the drop is

interpreted as a heat demand. Settings in 1 K steps are possible.

The temperature differential can be selected between 0 and 10 K.

Default setting : 5 K.

3.d Min output in CH/ tank mode (%) Setting range : 20 - 80

3.E The period activeting keep hot

function (comfort mode) (Combi

version)

Setting range: 20 - 60 minutes.

Default setting : 20 minutes.

3.F Domestic hot water standby

time after tapping during CH

mode (Combi version)

Heating mode is disabled for this period of time following DHW heating.

Setting range: 0 - 30 minutes.

Default setting : 1 minutes.

Service function Possible settings/display

Tab. 3 Menu 1

3

Service menu settings

Logamax Plus GB062

10

4.b max pre heat temperature for

comfort function (combi)

max DHW pre heat temperature for comfort function.

The following settings are possible:

• 40 … 65 ºC

Default setting : 62 º

4.E Boiler type It will be detected automaticly of DHW or tank NTC and shown in display.

Possible values:

• 0 : only heating

• 1 : Combi

• 2 : Tank with NTC (system boiler)

4.F Siphon filling mode Possible settings:

• 0 : Off

• 1 : On with min output (factory setting)

• 2 : On with changed min CH output

5.A Reset service reminder If you see this symbol, you can reset to “0” after inspection.

5.b Fan overrun time Time intervall for the maintanence (month)

0 = Off

1 .. 72 = Time (Month)

5.F Inspection intervall If you see this symbol, you can reset to “0” after inspection.

6.A Calling up the last fault saved The function enables you to retrieve the last fault stored.

The service function is reset at 00.

6.C Setpoint value of the tempera-

ture from EMS-BUS

6.d Current turbine flow rate (combi) The current turbine flow rate is displayed.

Possible displays are:

• 0.0. - 20.0. l/min

7.A Backlight of LCD The following settings are possible:

• 00: Off

• 01: on

Default setting : 00.

7.C Minimum DHW flow rate DHW heating is activated if amounts above this value are drawn off.

The following settings are possible (x 0,1):

• 25 … 50 litres per minute

Default setting : 25 l/min.

Service function Possible settings/display

Tab. 3 Menu 1

3

Service menu settings

Logamax PLus GB062

11

7.E Building dry function The building drying function of boiler doesn’t corresponds to the dry func-

tion of the weather depended controls.

In case of activation of this function, DHW and chmniy sweep function is

no tpossible. During this period you can the symbol (dr) in display.

The following settings are possible:

• 00: Off

• 01: On

Default setting : 00.

P.0 Activiation of integrated WDC

(Weather Depended Controls)

function and set point of sum-

mer switch set-temperatur

• 0: WDC function is Off

• 1...30: Temperaturlimit for summer and WDC activiation

Default setting : 0.

P.1 Setpoint B of the heat curve for

WDC

20 ... 50 : Flowtemperature (set point)

P.2 Setpoint A of the heat curve for

WDC

50.. 88 ... 90: Flowtemperature (set point)

P.6 LCD Backlight (Permanent) • 0: Off

• 1: On

Default setting : 0.

P.7 Domestic hot water comfort • 0: Eco mode

• 1: Comfort mode

Default setting : 0.

Service function Possible settings/display

Tab. 3 Menu 1

3

Service menu settings

Logamax Plus GB062

12

3.2.2 Menu 2

To call up a service function in this menu:

B Hold down “Back”, + and – at the same time until L.1 is

shown on the display.

B Press – until L.2 is shown on the display.

B Press OK to make settings in menu 2.

B Press + or – to scroll through the menu's service

functions.

Service function Possible settings/comments/displays

8.A Software version The current software version is displayed.

8.b Display soft code number

8.C Display internal status code internal parameter

8.d Display internal fault code internal parameter

8.E Returning the appliance to its

standard settings

This service function enables you to reset the appliance to its standard set-

tings.

Setting 00.

8.F Ignition test (permanent) • 0 = Off

• 1 = On

9.A Permanent operating mode This function permanently sets an operating mode.

The following settings are possible:

• 0: Standard operation; the appliance runs according to controller specifi-

cations.

• 1: The appliance runs at minimum output.

• 2: The appliance runs at maximum output.

Default setting : 0.

9.b Actual fan speed Actual fan speed in Hz

9.E Signal turbine delay

(Combi version)

Through spontaneous pressure change in the water supply, the flow meter

(turbine) can signal that water is being drawn off.

This means the burner starts briefly although no water is drawn off.

The turbine signal delay can be set from 1 to 8. One step corresponds to

0.25 seconds.

Default setting : 4 (0,25 seconds).

9.F Heating circuit pump overrun time The pump overrun time is started by the control system at the end of the

heat demand.

The following settings are possible:

• 1 to 10: overrun time in minutes (steps of 1 minute)

Default setting : 3 minutes.

A.A Temperature at flow temperature

sensor

This service function allows you to display the temperature at the flow tem-

perature sensor.

Tab. 4 Menu 2

3

Service menu settings

Logamax PLus GB062

13

A.b DHW temperature (Combi version) This service function allows you to display the DHW temperature.

A.C Temperature at cylinder tempera-

ture sensor (system version)

This service function allows you to display the temperature in the DHW cyl-

inder.

b.F DHW heating delay (solar mode) Heating will be suppressed until the DHW temperature sensor detects that

the water preheated by solar energy has reached the required outlet tem-

perature. Set the heating delay in accordance with system conditions.

The start delay can be set between 0 - 50 seconds.

Default setting is 0 (disabled).

F.2 Ionisation current • with running boiler (burner) :

– > 20 = OK

– < 20 = faulty

F.3 Permanent operation mode (chim-

niy sweeper)

Possible displays are:

• 0: normal operation mode

• 1: operation in max output for 15 minutes

Service function Possible settings/comments/displays

Tab. 4 Menu 2

3

Service menu settings

Logamax Plus GB062

14

3.2.3 Menu 3

To call up a service function in this menu:

B Hold down “Back”, + and – at the same time until L.1 is

shown on the display.

B Press – until L.3 is shown on the display.

B Press OK to make settings in menu 3.

B Press + or – to scroll through the menu's service

functions.

Code List for the Service function E.1 :

Service function Possible settings/comments/displays

E.1 Appliance type, output, DHW heat-

ing (soft code)

This service function allows you to adjust the control unit to the appliance

output and the type of DHW heating (see table below regarding the code list

for this service function). This is only necessary when the control unit is

replaced.

F.1 Gas Type With this service functlon is changed the gas type.

B To change the actual gas type, press + and - button together until the

scroll up/down symbol is shon in display.

• 0 : Naturalgas

• 1 : Liquidgas (LPG)

Tab. 5 Menu 3

Country Definition of Appliance

Soft

Code

TR (Turkey) GB062-22 KD ... 21

IT (Italy) GB062-24 (K) ..... 22

GB062-24 KD ...

23

GB062-14 ...

24

AT (Austria) GB062-24 (K) ... 22

PL (Poland) GB062-24 (K) ... 27

GB062-14 ...

29

RO (Romania) GB062-24 .... 27

GB062-24 KD ....

28

GR (Greece) GB062-24 .... 27

GB062-24 KD ...

28

SK (Slovakai) GB062-24 (K) .... 27

GB062-14 ....

29

CZ (Czech

Repuclic)

GB062-24 (K) .... 27

GB062-14 ....

29

BE (Belgium) GB062-24 KDE .... 28

GB062-24 KD ...

26

GB062-14 ....

30

GB062-24 ....

25

Tab. 6 Code table for the service function E.1

This parameter is only available/active for the

spare part change. By origin PCB (electronic

card) this function is only visible.

This parameter should be adjusted by each

PCB-Change regarding the TTNr. (Codelist is in

PCB included).

4

Fault finding

Logamax PLus GB062

15

4 Fault finding

4.1 Explanations of faults table

Each title of the table shows the error code in the display and

at the same time the cause of the error in general. To repair

any possible fault in the device, follow the troubleshooting

steps in order until the fault is detected.

4.2 Fault group definition

Shown failures are divided in diffrent category :

• RUN: Fault does not block the burner.

• WAIT: Fault blocks the burner until faults removes.

• BLOCK : Fault blocks the burner until mains supply off

(volatile lockout).

• LOCK: Faults blocks the burner (nonvolatile lockout).

• RESET : Fault causes a board reset.

• HIST : Fault code is only stored in EEPROM fault history.

Failure Code

Cause

Code

Failure

Category

Failure description Page

CL

324

RUN Hot water temperature sensor is faulty.

17

5L

323

RUN BUS-Communication fault. 19

CP

326

RUN WBC...D appliances (system boiler): Cylinder/tank temperature sensor. 20

3Y

334

WAIT The differential pressure switch is open before ignition (during self

check) (only high modulation version).

20

3C

217

WAIT Fan not running. 20

2E

207

WAIT Heating system charge pressure is too low. 23

8Y

232

WAIT External switching contact triggered. 24

4Y

223

WAIT Flow temperature sensor (CH-NTC) faulty. 26

4C

224

LOCK - Heat exchanger temperature limiter or flue gas temperature limiter has

tripped.

- The differential pressure switch does open when the fan runs (after

ignition) (only high modulation version).

30

6A

227

LOCK Flame not detected. 30

EC

256

LOCK Internal fault. 35

6C

228

LOCK Flame detected even when the burner is switched off. 36

6C

308

LOCK After switching gas off : Flame is detected. 37

EP

327

LOCK The “OK” button was actually pressed for at least 5 seconds (= reset). 38

WAIT Gradient Monitoring. 43

P

78

WAIT Appliance code not defined. 44

Tab. 7 Failure codes shown in display

4

Fault finding

Logamax Plus GB062

16

Faults that are not shown on the display

Fault description Page

Combustion noise too loud; rumbling noises 42

Water circulation noises 44

Heat-up lasts too long. 45

Flue gas readings incorrect; CO content too high. 47

Ignition too strong, or poor. 47

Condensate in air box. 47

DHW outlet temperature not reached. 47

DHW volume (flowrate) not reached. 47

No function, the display remains dark. 47

Tab. 8

4

Fault finding

Logamax PLus GB062

17

4.3 Faults and possible remedy steps

CL

Hot water temperature sensor (DHW-NTC) is faulty.

Step Remedy

1. Check the hot water temperature sensor for

breaks or short CLcircuits.

B Switch off the boiler.

B Remove the Socket of NTC.

B Measure the electrical resistance of DHW-

NTC (in Ω) (see NTC tables).

Is the resistance value correct ?

yes: --> 2.

no: B Change the Sensor.

B Switch on the boiler.

CL on display ?

-->2.

2. B Switch off the boiler.

B Cut the main voltage supply.

B Check the soft code via Service function

E.1.

Is the code correct ?

yes B Switch on the boiler.

CL on display ?

-->3.

no: B Correct the right boiler type co5Lde.

CL on display ?

-->3.

3. Check the cables for damages.

B Switch off the boiler.

B In case of DHW-NTC is changed :

- Remove the NTC socket.

- Measure the NTC resistance.

- Connect the socket again.

B Remove the big socket (20 Pole) on PCB.

B Measure the NTC resistance (Ω) on big

socket (PCB side).

Are measured resistance values on NTC

and socket side different ?

yes: B Change the cable haarness.

B Switch on the boiler.

CL on display ?

-->4.

no: --> 4.

4. Electronic board (PCB) is defect. B Switch off the boiler.

B Cut the main voltage supply.

B Change the electronic board (PCB).

B Switch on the main voltage supply.

B Switch on the boiler.

B END

4

Fault finding

Logamax Plus GB062

18

5L

BUS-Communication fault

Step Remedy

1. B Switch off the boiler.CP

B Cut the main voltage supply.

B Check the connection terminals at

controls and boiler.

Are the connection terminals dirty or

corroded ?

yes: B Clean the connection terminals.

B Connect the cable again.

B Switch on the boiler.

5L on display ? --> 2.

no: B Remove the control (thermostat) and check the

error again. If there is no error, check the control

(thermostat). Change if necessary, change it.

B Switch on the boiler.

--> 2.

2. B Check the connections between the

control (thermostat) and the boiler.

Is resistance very high ?

yes: B Switch on the boiler.

B Cut the main voltage supply.

B Change the connection cable between boiler and

control (thermostat).

B Switch on the boiler.

5L on display ? --> 2.

no: --> 3.

3. Electronic board (PCB) is defect. B Switch off the boiler.

B Cut the main voltage supply.

B Change the electronic board (PCB).

B Switch on the main voltage supply.

B Switch on the boiler.

B END

4

Fault finding

Logamax PLus GB062

19

CP

System boiler: Cylinder / tank temperature sensor.

Step Remedy

1. Check the tank temperature sensor for

breaks or short circuits.

B Switch off the boiler.

B Remove the NTC of terminal.

B Measure the electrical resistance of Tank-

NTC (in Ω) (see NTC tables).

Is the resistance value correct ?

yes: --> 2.

no: B Change the Sensor (NTC).

B Switch on the boiler.

CP on display ?

-->2.

2. B Switch off the boiler.

B Cut the main voltage supply.

B Check the soft code and boiler type via

Service function E.1 and 4.E.

Is it correct ?

yes B Switch on the boiler.

CP on display ?

-->3.

no: B Correct the right boiler type code.

CP on display ?

-->3.

3. Check the NTC cables.

B Is there any damages or short circuit or

break ?

yes: B Change the cable/NTC.

B Switch on the boiler.

CP on display ?

-->4.

no: --> 4.

4. Electronic board (PCB) is defect. B Switch off the boiler.

B Cut the main voltage supply.

B Change the electronic board (PCB).

B Switch on the main voltage supply.

B Switch on the boiler.

B END

4

Fault finding

Logamax Plus GB062

20

3Y

The differential pressure switch is open before ignition (during self check) (only high modulation version).

Steps Remedy

1. Check the contacts of diff. pressure

switch.

B Switch off the boiler.

B Check the connection of diff. pressure

switch.

B Measure the circuit with a instrument.

The circuit /contact should be closed.

Is the contact /circuit open ?

yes: B Change the diff. pressure switch.

B Switch on the boiler.

3Y ? -->2.

no: B Connect the diff. pressure switch again.

B Switch on the boiler.

-->2.

2. Check the silicon hose.

Is there any blockage or stuck on silikon

hose ?

yes: B Switch off the boiler.

B Change the silicon hose or correct the stuck.

B Switch on the boiler.

3Y ? -->3.

no: -->3.

3. Check the low voltage cable for damages

or open circuit.

B Switch off the boiler.

B Remove the connection of PCB and

measure the circuit of the diff.

pressure switch.

B Measure the circuit with a instrument.

The circuit /contact should be closed.

Is the contact /circuit open ?

yes: B Change the low valtage cable.

B Switch on the boiler.

3Y ? --> 4.

no: --> 4.

4. Electronic board (PCB) is defect. B Switch off the boiler.

B Cut the main voltage supply.

B Change the electronic board (PCB).

B Switch on the main voltage supply.

B Switch on the boiler.

B END

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Buderus Logamax GB062-24 KDH V2 User manual

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