Certikin MB105 Training

Brand: Certikin

Model: MB105

Type: Training

This manual is also suitable for

BOILERS LIMITED

Training notes for the following Certikin pool heaters:

Genie S

Genie C

Genie Dual

MB055 - MB405

COH110 - COH280

December 2011

Page 2

CONTENTS

Genie C Wiring 3

Genie C Schematic 4

Genie S Wiring 5

Genie S Schematic 6

Genie Dual Wiring 7

Genie Dual Schematic 8

Genie C & S Setup & Service Modes 9

Genie Dual Setup & Service Modes 11

Genie C & S Engineering Modes 13

Genie C, S & Dual Fault Guide 15

Genie C, S & Dual Parts Identiﬁ cation 18

Genie C, S & Dual Microcom Software 20

MB 055, 105 & 155 Wiring 22

MB 185, 265 & 405 Wiring 24

MB 055, 105 & 155 Troubleshooting 26

MB 185, 265 & 405 Troubleshooting 28

MB All Models Control Panel Lights 30

COH 100 - 275 Mk1 Wiring 31

COH 100 - 275 Mk1 Parts Identiﬁ cation 32

COH 110 - 280 Mk2 Wiring 34

COH 110 - 280 Mk2 Electrical Parts Ideniﬁ cation 35

COH 110 - 280 Flueing options 37

Oil Nozzle Sizing 38

Networking 39

Useful Multimeter Values 41

Page 3

GENIE C - WIRING

123456

9101112

131415

1617181920

ON /OFF

SWITCH

W ITH THE RMA L FU S E

TR A NS FO RME R

24 V

3 A mps

POOL SENSOR

Pool Th ermosta t

CONDENS ATE PS

FLOW SENSOR

EXCHANGER SE NSOR

2B2C

230 V

60 C

X1.1

X1.3

X1.5

X1.8

X1.10

FA N

X12.1

X12.8

X12.16

X12.3

X12.12

Hi Limit

X12.4

X12.14

X12.5 W

X12.11

910 ohm s

X12.13

240v 3 Wire

X12.2

X12.10

X1.7

X1.9

X1.2

Flue

230V / 50Hz

LIN K: R emove if seperate

switched liv e provided

WATE R P RESSURE SWITCH

R/B

Gy /Bk

G/ Y

Gy /Bk

HE AT DEMAN D

LO C K O U T A LA R M

FA N 23 0v

FA N TA C H O

RE SE T +ve

HI LIMIT

FA N P W M

MO D U LA TION +ve

RE SE T -ve

FA N +v e

FA N -v e

MO D U LA TION -ve

Gy /Bk

Bk B lack

B Bl ue

Gy Grey

Gy /Bk Grey/B lack

Br Brown

P Pink

V Violet

Y Yellow

R/ B R ed/B l ue

Or Orange

W White

G/ Y Green/Yellow

R Red

Control Stat

CVBC

Page 4

GENIE C - SCHEMATIC

Tf = Overheat stat,

Flue 100C

Th = Overheat stat,

Heat exchanger 150C

Tc = Limit temp control stat

Flow 80C

Tﬂ = Temperature Sensor

Flow

Tp = Temperature Sensor

Pool

Pw = Pressure Switch

Pool ﬂ ow

Tﬂ

Page 5

GENIE S - WIRING

123456

9101112

14151617181920

ON/OFF

SWITCH

W I TH TH E R M A L F U S E

TRANSFORMER

3 A mps

POOL SENSOR

P o ol The rmo st at

CONDENSATE PS

FLOW SENSOR

EXCHANGER SENSOR

2B2C

8 0C Co nt rol Sta t

X1.1

X1.3

X1.5

X1.8

X1.10

FA N

GyB k

X12.1

X12.8

X12.16

X12.3

X 1 2. 12

Hi Limit

X12.4

X 1 2. 14

X12.5 Or

X 1 2. 11

910 ohms

X 1 2. 13

X12.2

X 1 2. 10

X1.7

X1.9

X1.2

Flue

230V/50Hz

LINK: Remove if seperate

sw itched li ve provided

WATER PRESSURE SWITCH

R/B

Gy/B k

G/Y

HEAT DEM AND

LOCKOUT ALARM

FAN 230v

FAN TACHO

RESET +v e

HI L IM I T

FAN PWM

MODULATION +ve

RESET -v e

FAN +ve

FAN -ve

R/B

Gy/B k

Bk Black

B Blue

Gy Grey

Gy/B k Grey/Black

Br Brown

P Pink

V Violet

Y Yellow

R/B Red/Blue

Or Orange

W White

G/Y Green/Y ellow

R Red

G Green

MODULATION -ve

G/Y

PUMP

PUMP RELAY

GyB k

Hi Limit

Water

PUMP PRIMER

24 V

BBr

Br BrB

BBr

IG N IT I O N

CONTROL

Page 6

GENIE S - SCHEMATIC

Tﬂ

Tf = Overheat stat,

Flue 100C

Th = Overheat stat,

Heat exchanger 150C

To = Overheat stat

Flow 100C

Tc = Limit temp control stat

Flow 80C

Tﬂ = Temperature Sensor

Flow

Tp = Temperature Sensor

Pool

Pw = Pressure Switch

Pool ﬂ ow

Page 7

GENIE DUAL- WIRING

PL DM D

HT G D M D

HT R P M P

3P VL V

BU RNE R

LKOUT

RE SET

MODULATION

CO M B ' SE NSO R

++--

SE NSOR RTN

B' SEN SOR

PL SE NSOR

PR ESS URE

CO ND' HI

Bk Bl a c k

Bl ue

Br o wn

Gr e y

Orang e

Pi nk

Re d

Vi olet

White

KE Y

Y Ye llow

Flow s ens or

Po ol s ens or

Co mb usti on s ens or

Co nde nsa te

Level Switch

Po ol d em and

He ating d ema nd

Pe rma nen t Li ve

Fac t or y F it t ed L ink

Rem ove when s e per at e

swit c hed liv e s u pp lied

He ater pu mp

3 Po rt Va l v e

Co ntro l St at

X1 .1

X1 .3

X1 .5

X1 .8

X1 .1 0

FAN

Gy Bk

X1 2.1

X1 2.8

X1 2.1 6

X1 2.3

X1 2.1 2

Hi L i m i t

X1 2.4

X1 2.1 4

X1 2.5 Or

X1 2.1 1

910 ohms

X1 2.1 3

X1 2.2

X1 2.1 0

X1 .7

X1 .9

X1 .2

Flue

HEAT DEMAND

LO CKOUT ALARM

FAN 230v

FAN TACHO

RESET +ve

HI LIMIT

FAN PWM

MO DULATI ON +ve

RESET - ve

FAN +ve

FAN - ve

MO DULATI ON -ve

Hi L i m i t

Wat e r

IG NITION

CONTROL

10 060 9

Pr e s s ure Swi t c h

G/ Y BGy

Gy / B k

R/ B

Or V

VOr

G Green

315 m A

Page 8

GENIE DUAL - SCHEMATIC

Tf = Overheat stat,

Flue 100C

Th = Overheat stat,

Heat exchanger 150C

To = Overheat stat

Flow 100C

Tc = Limit temp control stat

Flow 80C

Tﬂ = Temperature Sensor

Flow

Tp = Temperature Sensor

Pool

Pw = Pressure Switch

Pool ﬂ ow

Tﬂ

Page 9

Lock/Reset

Button

On / Off

Switch

Temperature

Display

Pool Temperature

Control Knob

Fig. 9.0

Pressure

Gauge

GENIE C & S - SETUP & SERVICE MODES

WARNING: BEFORE COMMENCING OR COMPLETING ANY ELECTRICAL WORK ON THE APPLIANCE, IT IS

RECOMMENDED THAT THE BASIC SAFETY CHECKS FOR EARTH CONTINUITY, SHORT CIRCUIT, POLAR-

ITY AND RESISTANCE TO EARTH ARE MADE. ALL WORK CARRIED OUT SHOULD FOLLOW GUIDELINES

LAID DOWN BY THE I.E.E.

Operation

The Heater requires Mains on both the Live (L) and Switched Live (SL) connection to be able to run. It is delivered

with a link between them which can be removed if a separate Heater switched live is going to be used.

To run, the Heater must have a Mains supply, Gas, Pool Pump pressure sufﬁ cient to activate the Pressure Switch,

all safety switches closed and a pool temperature below the set point.

If all the above are correct then the Gas Ignition Control starts the Ignition sequence:

1. The Fan and internal Pump runs as a pre-purge of the Heat Exchanger

2. After a few seconds a spark is created at the electrode and the burner is lit.

3. The burner ﬂ ame is sensed and the spark is removed.

4. The Fan speed is then changed to the required speed according to the modulation curve.

5. If it fails to light the burner the spark will stop and the Fan and internal Pump will run on as a post-purge of

the Heat Exchanger.

6. The ignition sequence will be repeated up to ﬁ ve times, then the control will lockout and will require

a reset to start again.

Safety Controls & Lockouts

The Pool Thermostat Control indicates the actual and set temperature of the pool and also displays all the lock-

outs. The next pages detail the fault conditions, the indicators, the display and the actions required.

User Setup Mode

Turn off on the Panel Switch. Turn on with the Panel Switch whilst pressing the Lock/Reset Button.

The Control is now in User Setup Mode.

The control can now be altered by rotating the Pool Temperature Control Knob to a certain position and then

pressing the Lock/Reset button, then switching off. (See Fig. 9.0)

Example:

To change from Fahrenheit to Centigrade:

Turn Panel Switch OFF then back ON whilst pressing the Lock/Reset button.

Turn the Pool Temperature Control Knob until the display shows ‘F’.

Press the Lock/Reset button once and the display will show ‘C’.

Switch the Panel Switch OFF then back ON again.

The Control will now display in Centigrade.

Page 10

GENIE C & S - SETUP & SERVICE MODES

Service Mode

This is a special mode used to set the operation of the Control and to investigate fault conditions, it is entered from User

Setup Mode.

Rotate Pool Thermostat knob fully clockwise to show the software version number.

Press the Lock/Reset Button for 3 seconds. The control is now in Service Mode.

It is now possible to change some of the Control’s parameters. To show them, rotate the Pool Thermostat

Potentiometer. To zero or change them, press the Reset/Lock button

To exit, turn the Panel Switch off then back on again.

Test Temperature Display Mode 1 (td1).

Temperatures are displayed to 0.1 degree resolution, not the normal 1 degree.

The display will now show each sensor temperature and cycle around them for each press of the Lock/Reset button.

1. Pool temperature as normally displayed. The green LED will be alight.

2. Pool temperature is dispayed to 0.1 degrees. The green LED will be alight.

3. Heat exchanger ﬂ ow temperature. The yellow LED will ﬂ ash rapidly.

4. Heat exchanger combustion temperature. The red LED will ﬂ ash rapidly.

5. Aproximate pool water ﬂ ow in l/m for Genie 50 multiply by 0.738 for Genie 35. the red and yellow LEDs

alternate.

Rotating the potentiometer will change the set temperature. Pressing and holding the button whilst one of the tem-

peratures is displayed will ‘lock/unlock’ it on the display for continuous observation.

Service Mode Setting Factory Setting Reset press Display Indicator

1 Pressure Log Number of Operations Resets to zero Yellow LED ON

2 Overheat Log Number of Operations Resets to zero Red LED ON

3 Combustion Gas Log Number of Operations Resets to zero Count, Red LED ﬂ ashing

4 Gas Lockout Log Number of Operations Resets to zero Count, Red & Yellow LED ON

5 Condensate Blocked Log Number of Operations Resets to zero Count, Front Red PCB LED ON

6 Unused Rear Red PCB LED ON

7 Hours run 0 Press resets to zero 156 =1560 hrs both PCB LEDs on

8 Pool Temperature Offset 0.5 C (0.9 F) Steps of 0.5C (0.9F) -3.0C to 3.0C (-5.4 F to 5.4F)

9 Display td0 td1 td0 / td1

Genie S only

Genie C only

User Setup Mode Setting Factory Setting Alternative Display Indicator

1 Display units ° F = Fahrenheit ° C = Centigrade ° F or ° C

2 Maximum temperature 32 °C (90 °F) 41 °C ( 106 °F) PL or SPA

3 Software Version e.g 018

Page 11

GENIE DUAL - SETUP & SERVICE MODES

Page 12

GENIE DUAL - SETUP & SERVICE MODES

Page 13

GENIE C (up to V10) - FACTORY MODE

Genie Pool Thermostat, Engineering Mode

Background

As detailed in the Installation Instructions, it is possible, with the aid of a special setup plug, to enter into

an Engineering mode on this control.

Engineering Mode

Turn the Heater OFF with the Panel Switch

Remove the Front Top Panel and the Electrical Chassis Cover, remove the knob and Pcb retainer.

Pull off the PCB connector for the Sensors and replace with the Special Connector. (See Fig. 2.0)

Turn the Heater back ON.

Select the Parameter required by pressing the button, alter by rotating the potentiometer, then power off.

Replace the Sensor Connector and power back on

Parameters

NB. The following explanation uses Centigrade, if the control is setup for Fahrenheit the values will be

the equivelant.

1. bt1 or bt3. This sets the controls boilertype. bt1 is non-condensing, bt3 is condensing.

2. td0 and td1. This sets the display type, td0 is the default. td1 allows the temperatures of

the other sensors to be displayed to one decimal place.

Each press of the lock button moves the display to the next one.

a. Pool Temperature as normally displayed.. The Green LED will be alight.

b. Pool Temperature is dispayed to 0.1 degrees. The Green LED will be alight.

c. Heat Exchanger Flow Temperature. The Yellow LED will flash rapidly.

d. Heat Exchanger Combustion Temperature. The Red LED will flash rapidly.

Rotating the potentiometer will change the set temperature. Pressing and holding the

button whilst one of the temperatures is displayed will ‘lock/unlock’ it on the display for

continuous observation.

3. The proportional band. 0.0 to 7.9 degrees, the default is 1.0. This is the number of degrees

below setpoint modulation can start.

4. The DeltaT modulation point. 0 to 50 degrees, the default is 12. This also determines the

modulation charactersistic of the Heater. It is the temperature difference across the heat exchanger

where modulation will start.

Example: Default settings, 1 and 12. Required Pool temperature 30C.

At 28.9 pool temperature, no modulation in any circumstances

At 29.0 pool temperature and 10 degrees across the heat exchanger, no modulation.

At 29.0 poool temperature and 15 degrees across the heat exchanger, modulation.

If the propotional band is set to 0.0, there will be no modulation irrespective of the DeltaT setting.

If the DeltaT setting is 50, the Heater will always be in modulation.

It is recommended that the modulation points are not altered without consultation with the manufacturer.

Fig. 2.0

Page 14

GENIE C & S (from V10) - FACTORY MODE

Genie Pool Thermostat, Engineering Mode

Background

As detailed in the Installation Instructions, it is possible, with the aid of a special setup plug, to enter into

an Engineering mode on this control.

Engineering Mode

Turn the Heater OFF with the Panel Switch

Remove the Front Top Panel and the Electrical Chassis Cover, remove the knob and Pcb retainer.

Pull off the PCB connector for the Sensors and replace with the Special Connector. (See Fig. 2.0)

Turn the Heater back ON.

Select the Parameter required by pressing the button, alter by rotating the potentiometer, then power off.

Replace the Sensor Connector and power back on

Parameters

NB. The following explanation uses Centigrade, if the control is setup for Fahrenheit the values will be

the equivelant.

1. bt1 or bt3. This sets the controls boilertype. bt1 is non-condensing, bt3 is condensing.

2. td0 and td1. This sets the display type, td0 is the default. td1 allows the temperatures of

the other sensors to be displayed to one decimal place.

Each press of the lock button moves the display to the next one.

a. Pool Temperature as normally displayed.. The Green LED will be alight.

b. Pool Temperature is dispayed to 0.1 degrees. The Green LED will be alight.

c. Heat Exchanger Flow Temperature. The Yellow LED will flash rapidly.

d. Heat Exchanger Combustion Temperature. The Red LED will flash rapidly.

Rotating the potentiometer will change the set temperature. Pressing and holding the

button whilst one of the temperatures is displayed will ‘lock/unlock’ it on the display for

continuous observation.

3. The proportional band. 0.0 to 7.9 degrees, the default is 1.0. This is the number of degrees

below setpoint modulation can start.

4. The DeltaT modulation point. 0 to 50 degrees, the default is 12. This also determines the

modulation charactersistic of the Heater. It is the temperature difference across the heat exchanger

where modulation will start.

Example: Default settings, 1 and 12. Required Pool temperature 30C.

At 28.9 pool temperature, no modulation in any circumstances

At 29 0 l t t d 10 d th h t h d l ti

Fig. 2.0

Page 15

DISPLAY

LOCK / RESET

GREEN

YELLOW

RED

LED1

RED

LED2

Running, raising pool temperature to 28°C

Up to temperature, 28°C

Insufﬁ cient water pressure. Filter?, Blockage?

‘OH2’ Flue gas over temperature. Allow to

cool then investigate in Engineering Mode.

Reset with Button

‘GAS’ Gas Control Lockout. Unable to light burner, reset with Button.

OR Flue or Water Stat tripped, reset on stat OR Fan resistor open

cicuit, investigate cause. OR Valve Coils faulty. See “Gas” section

FRONT PANEL ON PCB EXPLANATION

OFF, no mains supply or failed power supply

Flashing

‘HI’ Condensate level high. Blocked? Clear

obstruction and allow control to auto reset .

‘SEr’ alternating with pool temperature. Serv-

ice required, working hours has reached

setpoint.

GENIE C, S & DUAL - FAULT FINDING

Page 16

GENIE C, S & DUAL - FAULT FINDING

DISPLAY

LOCK / RESET

GREEN

YELLOW

RED

LED1

RED

LED2

FRONT PANEL ON PCB EXPLANATION

‘P’ alternating with ‘oc’ = Pool sensor open circuit OR No net-

work detected if a Master in a multiple heater installation

‘P’ alternating with ‘cc’ = Pool sensor short circuit

‘F’ alternating with ‘oc’ = Heat Exchanger

Flow sensor open circuit

‘H’ alternating with ‘oc’ = Heat Exchanger

Combustion sensor open circuit

‘H’ alternating with ‘cc’ = Heat Exchanger

Combustion sensor short circuit

‘F’ alternating with ‘cc’ = Heat Exchanger

Flow sensor short circuit

‘Err’ alternating with ‘4’ = Pool potentiometer open circuit

‘Err’ alternating with ‘5’ = Pool potentiometer short circuit

For all of the above. Turn off, correct problem and turn back

on again and the display and operation will be normal.

‘Err’ alternating with ‘6’ = Heating potentiometer short circuit

‘Err’ alternating with ‘7’ = Heating potentiometer short circuit

Page 17

Fault will not clear

Replace CVBC on

gas valve. Check for

bent pins. Fault will

self clear

Fault clears brieﬂ y (for 1 sec) Fault clears Brieﬂ y (for 20 sec)

YES

Is wiring and con-

nections between

CVBC and fan OK?

YES

NO Is gas being re-

leased by the gas

valve?

YES

NO Check

wiring /

Replace gas

valve

Suspect CVBC

to be at fault

Replace Gas

valve. Fault will self

clear

Is CVBC seated

on gas valve

correctly?

Is continuity of gas

valve coils OK?

V1 = 2.8kΩ

V2 =1.6kΩ

Are there any

faults in the wir-

ing or connec-

tors?

Rectify fault. Fault

will self clear

Suspect CVBC

to be at fault Replace CVBC

NB - A fault involving the Gas valve circuit will

occur even if there is no heating demand. Reset

appliance when there is no heat demand to iden-

tify a fault of this nature. Once corrected, there is

no need to use the reset button, as the fault will

self clear.

Have either

the Flue gas or

Water ﬂ ow tem-

peratures been

exceeded?

With main power

off push the red

reset buttons on

the Flue and Flow

limit devices.

YES

NOT CLEARED

Investigate cause

of overheating.

Are overheat

limit devices

working cor-

rectly?

Check limit

devices are not

open circuit.

Replace faulty limit

devices.

NOT CLEARED

Are connec-

tors and wiring

between the

CVBC and limit

devices OK?

Replace faulty wiring

as necessary

Ensure wiring at

the connections

to the CVBC are

in good condition.

Suspect CVBC

to be at fault

Replace CVBC

Fan runs throughout Fan does not run

Does appliance reach

ignition stage (can you

hear the spark)?

Does gas ignition take

place (seen through sight

glass) but only for 10

secs?

Is appliance earth-

ing, the condition and

connection of electrode

and lead OK?

Replace faulty parts

Replace CVBC

Replace fan

NB - A fault involving the high limit circuit will occur even if

there is no heating demand. Reset appliance when there is no

heat demand to identify a fault of this nature. Once corrected,

the reset button will need to be pushed, as this fault will not self

clear.

NB - A fault involving the fan circuit or ignition circuit can

only occur if there is a heat demand. Once corrected, the

reset button will need to be pushed, as this fault will not self

clear.

NB - A fault in the ionisation circuit will be identifyable when

the ignition cycle is repeated 5 times.

Page 18

GENIE C, S & DUAL - SPARES

SPMBC009

100C Flow Overheat Stat

SPMBG055

80C Flow Control Stat

SPMBC011

Flow Sensor

Genie S

SPMBG057

Pool Thermostat PCB

SPMBG008

Condensate Pressure Switch

SPMBG054

Relay

SPCOH2/003

Pressure Gauge

Page 19

GENIE C, S & DUAL - SPARES

Item Mfg’ Part Number Supplier Part No

Primary Heat Exchanger (Genie35) M2136 SPMBG001

Primary Heat Exchanger (Genie 50) M2139 SPMBG002

Secondary Heat Exchanger (Bowman) M2745 SPMBG053

Propane Oriﬁ ce (Genie 35) M2150 SPMBG014

Propane Oriﬁ ce (Genie 50) M2151 SPMBG015

Combustion Fan M2138 SPMBG003

Gas Valve M2140 SPMBG004

Ignition Control (Honeywell) M2141 SPMBG005

Pool Thermostat PCB M2746 SPMBG057

Heat Exchanger Door Seal M2995 -

Relay M2688 SPMBG054

Pressure Gauge M4240 SPCOH2/003

Water Pressure Switch 651284 SPCOH2/014

HT Lead M2142 SPMBG006

Condensate Syphon M2143 SPMBG007

Condensate Pressure Switch M2144 SPMBG008

Spark & Sense Electrode M2146 SPMBG010

Flue High Limit Thermostat M2875 SPMBG060

Flow Control Thermostat M2667 SPMBG055

Flow High Limit Thermostat M0868 SPMBC009

Flow Sensor (Genie C) M2149 SPMBG013

Flow Sensor (Genie S) M3338 SPMBC011

Pool Temperature Sensor M2798 SPCOH2/002

Genie Pump M2683 SPMBG056

Expansion Vessel M3369 SPCOH103

Page 20

Genie CVBC Honeywell Controller error codes

Several checks are included to protect the boiler and its environment. Some checks are made even when

there is no demand for heat and will lead to “gas” lockout, which can only be cleared when the fault is recti-

ﬁ ed. This includes the High Limit thermostats (in the ﬂ ue and on the primary ﬂ ow pipe) and the electrical

connection to the gas valve coils.

Other “gas” lockouts will occur during the heating operation of the unit and in the case of some lockout and

blocking conditions the fan may still operate depending on the parameter option fan On/Off during error.

Complete list of errors is given as following:

External Lock out conditions: Internal lock out conditions:

01 Flame lockout after several ignition trials 10 EEPROM (I2C) com error

02 False Flame Lockout. 20 IO Error

03 High Limit error 21 ADC test HUP

05 Fan Tacho Signal error 22 ADC test LUP

08 Flame circuit error

Blocking condition codes:

09 Valve driver circuit error

34 Low mains voltage

35 Mains Frequency error

36 Mains difference error

xx Other faults

External Lock out condition codes

FAULT 1 = Lock out signal after no ﬂ ame and/or all ignition attempts have completed. This error condition is

stopping the boiler and to get to the normal operation again, a manual reset is required.

FAULT 2 = False Flame error - when a ﬂ ame current is detected in when there should be no ﬂ ame present

(i.e. when the gas valve is closed).

FAULT 3 = High limit error – if one or both of the two High Limit sensors detects a temperature of more then

105C or if Hi limit sensors or wiring is open circuit an error 3 will be generated.

FAULT 5 = Fan Tacho Error – The measured fan speed is not within 900 RPM of the

requested fan speed after 20 seconds. Connections or fan is open circuit.

FAULT 8 = Flame circuit error - during normal operation of the ignition controller, the ﬂ ame circuit is regu-

larly checked. This check compares actual to predicted behaviour patterns and will result in error 8 if the

actual readings fall outside the predicted.

Internal Lock out condition codes

FAULT 10 = EEprom communication error. Non correct behaviour of the I2C protocol caused this error to

happen. EEPROM is not accessible. Fault with communications port on the controller itself. Replace Hon-

eywell controller if this fault persists.

FAULT 20 = IO error. Internal check of valve command and the signal feedback. The high limit circuit signal

is also checked. If the feedback signals are not aligned with commands for more than 3.5s, then a lockout

occurs.

GENIE C, S & DUAL - MICROCOM SOFWARE

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