Hoshizaki American, Inc. RFH3-SSB-J-2 User manual

ISSUED:

73077

MARCH 8, 1999

NUMBER:

MARCH 18, 2003

REVISED:

with

HOSHIZAKI

TempGuard

TM

REACH-IN

MODELS

RH1-SSB(-HD/-GD) FH1-SSB(-HD)

RH2-SSB(-HD/-GD) FH2-SSB(-HD)

RH3-SSB(-HD/-GD) FH3-SSB(-HD)

RIR2-SSB51-02

RFH2-SSB(-HD)

RFH3-SSB(-HD)

2

Only qualified service technicians should attempt to service or maintain this unit. No

service or maintenance should be undertaken until the technician has thoroughly read

this Service Manual.

HOSHIZAKI AMERICA, INC.

618 Highway 74 South

Peachtree City, GA 30269

Attn: HOSHIZAKI Technical Support Department

Phone: 1-800-233-1940 Technical Service

(770) 487-2331

Fax: (770) 487-3360

NOTE: To expedite assistance, all correspondence/communication MUST include the following

information:

• Model Number

• Serial Number

• Complete and detailed explanation of the problem

IMPORTANT

HOSHIZAKI provides this manual primarily to assist qualified service technicians in the

service and maintenance of the unit.

Should the reader have any questions or concerns which have not been satisfactorily

addressed, please call or write to the HOSHIZAKI Technical Support Department for

assistance.

3

Please review this manual. It should be read carefully before the unit is serviced or main-

tenance operations are performed. Only qualified service technicians should service and

maintain the unit. This manual should be made available to the technician prior to service

or maintenance.

CONTENTS

PAGE

I. ELECTRONIC CONTROL OPERATION .................................................................. 4

1. NORMAL ELECTRONIC CONTROL PROCESS

FLOW ......................................

OPERATION FOR REFRIGERATOR.............................................................. 4

2. TIME - TEMPERATURE CONTROL CHART FOR REFRIGERATOR ............... 5

3. NORMAL ELECTRONIC CONTROL PROCESS .................................................

FLOW OPERATION FOR FREEZER .............................................................. 6

4. TIME - TEMPERATURE CONTROL CHART FOR FREEZER........................... 7

5. DISPLAY BOARD .............................................................................................. 8

6. ALARM / ALERT SIGNALS ............................................................................. 10

7. DEFROST FOR REFRIGERATOR .................................................................. 16

8. DEFROST FOR FREEZER .............................................................................. 16

9. START-UP DELAY........................................................................................... 16

10. PERIMETER FRAME HEATER ...................................................................... 17

11. GLASS DOOR HEATER ................................................................................. 17

12.

DIAGNOSTIC MENU ....................................................................................... 17

13. CONTROL BOARD ......................................................................................... 20

II.

SERVICE DIAGNOSIS ........................................................................................... 22

III. REMOVAL AND REPLACEMENT OF COMPONENTS ....................................... 26

1. SERVICE FOR REFRIGERANT LINES ........................................................... 26

2. BRAZING ......................................................................................................... 27

3. REMOVAL AND REPLACEMENT OF COMPRESSOR................................... 28

4. REMOVAL AND REPLACEMENT OF DRIER ................................................. 29

5. REMOVAL AND REPLACEMENT OF EXPANSION VALVE ........................... 30

6. REMOVAL AND REPLACEMENT OF EVAPORATOR .................................... 31

7. REMOVAL AND REPLACEMENT OF DOOR GASKET .................................. 31

8. REMOVAL AND REPLACEMENT OF DOOR CLOSURE SPRING .................. 32

9. REMOVAL AND REPLACEMENT OF CONTROL BOARD .............................. 33

10. DOOR RE-HINGING ......................................................................................... 34

IV. CLEANING INSTRUCTIONS ............................................................................... 35

V. WIRING DIAGRAMS ............................................................................................ 36

4

Note:

1) Cut-on / Cut-off / and Cabinet Temperature are read by the same sensor, called “cabinet

thermistor.

2) Defrost Thermistor reads Evaporator temperature.

I. ELECTRONIC CONTROL OPERATION

1. NORMAL ELECTRONIC CONTROL PROCESS FLOW OPERATION FOR REFRIGERATOR

POWER ON

Board Self Check

Display Read R##

(## is chip revision)

1) Frame heaters on

2) Evaporator fan on

2.5 minute delay

1. Compressor start-up

2. Condenser Fan start-up

Cycle Off (Cut-out

Temperature reached)

[Minimum 2.5 minutes]

1) Compressor off

2) Condenser Fan off

(Normal Cycling)

Cycle On (Cut-on

Temperature reached)

[Minimum 2.5 minutes]

1. Compressor on

2. Condenser Fan on

(Normal Cycling)

If evaporator temperature

reaches 13°F, unit initiates

defrost.

Compressor off

(Note: Condenser Fan and

Evaporator Fan are on.)

Evaporator temperature

reaches 40°F, defrost

terminated

Compressor on

Condenser Fan on

Continues as

Normal Cycling

Continues as

normal cycling

5

2. TIME - TEMPERATURE CONTROL CHART FOR REFRIGERATOR

6

3. NORMAL ELECTRONIC CONTROL PROCESS FLOW OPERATION FOR FREEZER

Note:

1) Cut-on / Cut-off / Cabinet Temperature are read by the same sensor, called “cabinet

thermistor.

2) Defrost Thermistor reads Evaporator temperature.

POWER ON

Board Self Check

Display Read R##

(## is chip revision)

Frame heaters on

2.5 minute delay

1. Compressor start-up

2. Condenser Fan start-up

3. Evaporator Fan start-up

Cycle Off (Cut-out

Temperature reached)

[Minimum 2.5 minutes]

1. Compressor off

2. Condenser Fan off

3. Evaporator Fan off

Cycle On (Cut-on

Temperature reached)

[Minimum 2.5 minutes]

1. Compressor start-up

2. Condenser Fan start-up

3. Evaporator Fan start-up

Defrost Start

Preprogrammed time interval

1. Compressor off

2. Evaporator Fan off

3. Condenser Fan off

4. Defrost Heater on

5. “dEF” displayed

Defrost end

defrost thermistor

reached 100°F

Defrost Heater off

Five minutes after

Defrost Heater off

1. Compressor on

2. Condenser Fan on

Evaporator temperature

reaches below 25°F

1. Evaporator Fan on

Cabinet temperature reads

a value below 15°F above

the setpoint.

“dEF” no longer displayed,

cabinet temp. displayed.

Continue as

Normal Cycling

7

4. TIME - TEMPERATURE CONTROL CHART FOR FREEZER

8

5. DISPLAY BOARD

The Display Board is located on the right hand side of the painted Control Panel between the top of

the Door and the Front Panel. From this area information regarding the functioning of the unit can be

obtained. From the Display Board various electronic controls and functions can also be adjusted.

Removing the Front Panel by lifting the panel up approximately one-half inch, then pulling it forward,

permits access to the Error Code Label, the Control Box and the Control Panel.

9

When unit is turned on, first display is “R##”, where “##” indicates chip revision level.

1) TEMPERATURE DISPLAY

• The cabinet temperature is displayed (factory set is °F, but can be changed to read °C).

• The cabinet temperature is updated every 20 seconds.

• During refrigerator defrost, the cabinet temperature is displayed.

• During freezer defrost, the cabinet temperature is not displayed, “dEF” is displayed in its

place.

2) GUARDED ACCESS MENU

Three settings can be viewed and changed from this menu:

1. The Temperature Setpoint. This setpoint is the value for the average cabinet

temperature.

2. Defrost Frequency.

Refrigerator: Automatic defrost. “df X” has no effect.

Freezer: Ex. “dF 4” = 4 defrost cycles per day.

3. Units of Display. F = Fahrenheit, C = Celsius

To enter this menu, press and hold the up/down arrows together for 3 seconds. The

Temperature Setpoint will be displayed first. To change a value, push the up/down arrows until

the desired value is displayed. Then push “ENTER” to set the value and view the next setting.

If no change in the value is desired, press “ENTER”, and the next setting will be displayed.

At the end of the sequence, press “ENTER” and the unit will return to normal display mode.

Note: End sequence and press “Enter” for changes to take effect. If sequence is

not ended by pressing “ENTER,” display will return to normal temperature

display and no changes will take effect.

10

ALARM

3 beeps

every ten

seconds

4 beeps

every 10

seconds

[FREEZER

ONLY]

5 beeps

every 10

seconds

RESET OPTIONS

Press “RESET.” If temp. has

returned to setpoint range, alarm

will stop and “E1” will clear.

If temp. is not back in range, “RE-

SET” will silence the alarm for 5

minutes. “E1” will continue to flash.

Press “RESET.” If temp. has

returned to setpoint range, alarm

will stop and “E2” will clear.

If temp. is not back in range, “RE-

SET” will silence the alarm for 5

minutes. “E2” will continue to flash.

Press “RESET.” Alarm will stop

and “E3” will clear.

If 4 consecutive defrosts take

more than 1 hour, a qualified

service technician must be

called.

For the Service Tech to reset this

alarm, press “RESET” on the

Control Board itself.

PROBLEM

[FREEZERS WITH BOARD

REVISION LEVEL 10 OR

BELOW AND ALL

REFRIGERATORS]

Cabinet temp. has

exceeded set temp. by

10°F for more than 2

hours.

[FREEZERS WITH BOARD

REVISION LEVEL 11 AND

ABOVE]

Cabinet temp. has

exceeded set temp. by

25°F for more than 4

hours.

(FOR BOARD REVISION

LEVEL SEE “[1] NORMAL

ELECTRONIC CONTROL

PROCESS FLOW

OPERATION”)

Cabinet temp. has

remained below setpoint

by 8°F for more than 1

hour.

Defrost has taken

longer than 1 hour.

Control Board has

terminated defrost.

ERROR

MESSAGE

“E1” every 2

seconds,

alternating

with cabinet

temp. readout

“E2” every 2

seconds,

alternating

with cabinet

temp. readout

“E3” every 2

seconds,

alternating

with “dEF” or

cabinet temp.

6. ALARM / ALERT SIGNALS (*EXCLUDING GLASS DOOR MODELS)

11

RESET OPTIONS

Press “RESET.” If pressure switch

resets automatically, alarm will

stop and “E4” will clear when

pressure switch closes.

If switch trips 5 times in 1 hour

compressor will be stopped, and

not re-start. A service technician

must be called.

For the Service Tech to reset this

alarm, press “RESET” on the

Control Board itself.

Alarm automatically resets when

acceptable voltage is detected.

Press “RESET” to silence alarm for

5 minutes.

Alarm automatically resets when

acceptable voltage is detected.

Press “RESET” to silence alarm for

5 minutes.

Clean filter. Allow time for sensor

to react, then press “RESET.”

During alarm, press “RESET” to

silence alarm for 2 hours.

If this alarm occurs frequently,

discharge temperature is consis-

tently too high.

Replace sensor. Alarm will reset.

During alarm press “RESET” to

silence buzzer for 5 minutes.

Replace sensor. Alarm will reset.

During alarm press “RESET” to

silence buzzer for 5 minutes.

*Close door. During alarm, press

“RESET” to silence buzzer for 3

minutes.

PROBLEM

Compressor dis-

charge pressure is

outside normal oper-

ating range. Pressure

switch has been

triggered 3 or more

times in 1 hour.

Line voltage is too

high.

Line voltage is too

low.

Condenser filter

needs cleaning.

Cabinet temp. sensor

has failed.

Defrost temp. sensor

has failed.

*Display: Door open

Display and sound:

Door open longer than

3 minutes.

ALARM

6 beeps

every 10

seconds

8 beeps

every 10

seconds

9 beeps

every 10

seconds

1 beep

every 10

seconds

Continuous

buzzer

Continuous

buzzer

*2 beeps

every ten

seconds

ERROR MESSAGE

“E4” every 2 sec-

onds, alternating with

cabinet temp.

“E6” every 2 seconds,

alternating with

cabinet temp.

“E7” every 2 sec-

onds, alternating with

cabinet temp.

“CF” every 2 sec-

onds, alternating with

cabinet temp.;

“CLEAN FILTER”

LED lights.

“E8” every 2 seconds

“E9” every 2 sec-

onds, alternating with

the cabinet temp.

*“door” every 2

seconds, alternating

with the cabinet temp.

12

RESET OPTIONS

*When communication is restored,

alarm will reset.

*During alarm, press “RESET” to

silence buzzer for 18 hours.

PROBLEM

*Freezer and Refrig-

erator boards not

communicating

properly to control

compressor delay

(RFH only).

ALARM

*10 beeps

every 10

seconds

ERROR MESSAGE

*“E10” every 2 sec-

onds, alternating with

cabinet temp.

*EXCLUDING GLASS DOOR MODELS

13

a) HIGH TEMPERATURE ALARM FUNCTION

FOR FREEZERS WITH BOARD REVISION LEVEL 10 OR BELOW* AND FOR ALL REFRIGERATORS,

when c

abinet temp. has exceeded set temp. by 10°F or more for more than 2 hours;

OR FOR FREEZERS WITH BOARD REVISION LEVEL 11 AND ABOVE**, when cabinet temp. has

exceeded set temp. by 25°F or more for more than 4 hours,

an alarm buzzer sounds 3 beeps every 10 seconds, and an error message “E1” flashes

every 2 seconds, alternating with the cabinet temperature readout.

Reset Options:

If temperature has returned to setpoint range, pressing “RESET” on the Display Board will stop

the buzzer and clear the “E1” message.

If temperature is not back in range, pressing “RESET” on the display board will silence the

buzzer for 5 minutes. The “E1” message will continue to flash.

Note: Setting DIAGNOSTIC MENU item 3 to ON resets all alarms regardles of whether or not

setpoints are reached. This is a complete clearing of all alarms. See DIAGNOSTIC

MENU for details.

*FOR BOARD REVISION LEVEL SEE “[1] NORMAL ELECTRONIC CONTROL PROCESS FLOW

OPERATION”.

**UNLESS OTHERWISE NOTED.

b) LOW TEMPERATURE ALARM FUNCTION

When the cabinet temperature has been below the setpoint by 8°F for more than 1 hour, the

buzzer will sound 4 beeps every 10 seconds, and “E2” will flash every 2 seconds, alternating

with the cabinet temperature readout.

Reset Options:

If temperature has returned to setpoint range, pressing “RESET” on the Display Board will stop

the buzzer and clear the “E2” message.

If temperature is not back in range, pressing “RESET” on the Display Board will silence the

buzzer for 5 minutes. The “E2” message will continue to flash.

Note: Setting DIAGNOSTIC MENU item 3 to ON resets all alarms regardles of whether or not

setpoints are reached. This is a complete clearing of all alarms. See DIAGNOSTIC

MENU for details.

c) DEFROST ERROR ALERT FUNCTION [FREEZER ONLY]

If, for any reason, the defrost takes longer than 1 hour, the alarm buzzer will sound 5 beeps

every 10 seconds, and “E3” will flash every 2 seconds, alternating with either “dEF” or the

cabinet temperature. If this alarm activates, the Control Board will automatically terminate the

defrost.

Reset options:

Pressing “RESET” on the Display Board will reset the buzzer and clear the “E3” from the

display.

14

IMPORTANT

If 4 consecutive defrosts take more than 1 hour, pressing “RESET” on the Display Board will

only silence the buzzer until the next defrost that lasts more than 1 hour.

For the Service Tech to reset this alarm, press “RESET” on the Control Board itself.

d) HIGH PRESSURE ALERT FUNCTION

In order to protect the compressor if the discharge pressure reaches a preset value (outside the

normal operating range), a switch will temporarily stop the compressor. At another preset

pressure, the compressor will attempt to restart. If the switch is triggered 3 times in 1 hour, the

buzzer will sound 6 beeps every 10 seconds, and “E4” will flash every 2 seconds, alternating

with the cabinet temperature. The same sequence will occur if the switch trips the fourth time in

1 hour.

Reset Options:

During the third and fourth trip alarm, the buzzer can be silenced by pressing” RESET” on the

Display Board.

The buzzer and display will automatically reset when the pressure switch closes after the 3rd

and 4th reset.

After the 5th pressure trip, the buzzer can be silenced for 1 hour by pressing “RESET” on the

Display Board.

IMPORTANT

If the switch trips 5 times in 1 hour, the compressor will be stopped, and a service technician

must be called.

For the Service Tech to reset this alarm, press “RESET” on the Control Board itself.

e) HIGH VOLTAGE ALERT FUNCTION

When the unit detects the line voltage is above a preset value for 10 seconds, to protect the

compressor, the compressor will shut down. The buzzer will sound 8 beeps every 10 seconds.

“E6” will flash every 2 seconds, alternating with the cabinet temperature.

Reset Options:

This alarm automatically resets when an acceptable voltage is detected.

The buzzer can be silenced for 5 minutes while in alarm by pressing “RESET” on the Display

Board.

f) LOW VOLTAGE ALERT FUNCTION

When the unit detects the line voltage is below a preset value for 10 seconds, to protect the

compressor, the compressor will shut down. The buzzer will sound 9 beeps every 10 seconds.

“E7” will flash every 2 seconds, alternating with cabinet temperature.

15

Reset Options:

This alarm automatically resets when an acceptable voltage is detected.

The buzzer can be silenced for 5 minutes while in alarm by pressing “RESET” on the Display

Board.

g) CLEAN FILTER ALERT FUNCTION

The unit is equipped with a filter for protecting the condenser from dirt, oils, grease, etc. The filter

promotes clean condenser surfaces and efficient operation and should be checked monthly and

cleaned when necessary. The unit is also equipped with a sensor to determine if this filter is

excessively dirty. If the unit detects that the condenser filter is excessively dirty, it will flash “CF”

every 2 seconds, alternating with the cabinet temperature. The “CLEAN FILTER” LED will light

up and the alarm buzzer will sound 1 beep every 10 seconds.

After cleaning the filter, allow time for the sensor to react, then press “RESET” on the Display

Board to reset the alarm.

During the alarm, pressing “RESET” on the Display Board will silence the alarm buzzer for

2 hours.

IMPORTANT

If this alarm occurs frequently, the compressor discharge temperature is consistently too high.

Note: If in alarm, and press reset during off cycle, may reset alarm even if filter is not yet clean.

However, alarm will reactivate when compressor discharge temperature indicates clogged

filter.

h) SENSOR ERROR

This unit uses two sensors to monitor internal temperatures:

Sensor #1: Cabinet Temperature Sensor. If this sensor fails, a continuous buzzer sounds

and “E8” will flash every 2 seconds, alternating with the sensor’s interpretation of cabinet

temperature.

Sensor #2: Defrost Temperature Sensor. If this sensor fails, a continuous buzzer sounds

and “E9” will flash every 2 seconds, alternating with the cabinet temperature.

These alarms automatically reset when a functioning sensor is installed.

During the alarm, pressing “RESET” on the display board will silence the buzzer for 5 minutes.

i) DOOR AJAR (EXCLUDING GLASS DOOR MODELS)

Immediately upon door opening, unit displays “door” alternating with cabinet temperature

every 2 seconds. After 3 minutes with the door open, displays “door” alternating with cabinet

temperature every 2 seconds, and 2 beeps every 10 seconds. During Alarm, pressing

“RESET” on the display board will silence the alarm for 3 minutes. To reset alarm, close door.

16

j) COMMUNICATIONS ERROR (DUAL TEMPERATURE UNITS ONLY)

Dual temperature unit fails to communicate with other board. Refrigerator board and freezer

board are not communicating properly to delay the compressor interval at startup of one unit

to another.

Display: “E10” is displayed and alternates every two seconds with cabinet temperature.

Buzzer: Buzzer sounds 10 beeps every 10 seconds.

Reset: Resets automatically if communication is restored.

Silence: Press “RESET” on display to silence buzzer for 18 hours.

7. DEFROST FOR REFRIGERATOR

This unit uses an off cycle defrost. A sensor in the evaporator coil determines the need for a

defrost. When the sensor reaches the initiation setpoint, the unit enters defrost. When the unit

reaches the termination setpoint, the unit ends defrost. The off cycle defrost requires no

programming; it automatically initiates and terminates.

Note: In the program menu (#1=T set, #2=dF set, #3=° F or °C set), dF=x has

no effect. This is displayed because the same board is used for freezer units,

which require a time-initiated defrost.

8. DEFROST FOR FREEZER

This unit is preset at the factory to defrost 4 times per day for general conditions. However, if it

is determined that this interval does not suit the actual conditions the unit is exposed to, the

interval can be altered. To make a change of this sort, enter the GUARDED ACCESS MENU

[See “2)”], press “ENTER” one time. Now “dF #” is displayed (where “#” is the number of

defrosts the unit will activate in a 24 hour period) . Use the up/down arrows to change the

number of defrosts to the desired value. The minimum number of defrosts is 1 in a 24 hour

period, the maximum number of defrosts is 8 in a 24 hour period. Please note that the defrost

is a heated defrost, and therefore will have a tendency to raise cabinet temperature. Cabinet

temperature is not displayed during defrost; “dEF” is displayed in its place.

Note: The change in the defrost setting will take effect after the next defrost based

on the previous setting. If it is desired that this change in interval timing take

effect immediately, turn the unit off and back on. The next defrost will take

effect “x” hours after power is resupplied. For example, if set df 4, x=6, the

next defrost will take place 6 hours from the time that power is applied.

9. START-UP DELAY

The start circuit of the compressor is timed such that at power-up and during any compressor

off time, there will be at least a 2 1/2 minute delay before the compressor will start.

Note: The compressor must run 2 1/2 minutes minimum during every run cycle.

17

10. PERIMETER FRAME HEATER

This unit is equipped with a perimeter frame heater. This prevents the formation of condensate

on the front frame of the unit under high humidity conditions. If operating the unit under

conditions where condensate will not form, these heaters may be turned off using the switch

on the control box.

11. GLASS DOOR HEATER

Glass Door units are equipped with a door heater. This prevents the formation of condensate on

the glass under high humidity conditions. If operating unit under conditions where condensate

will not form, these heaters may be turned off using the switch on the control panel.

12. DIAGNOSTIC MENU

Access to Diagnostic Menu is gained by pressing and holding the up/down arrows and

ENTER button together for three seconds. Scroll through menu options using the ENTER

button. Change options using up/down arrows. Reset alarm conditions using RESET

button. To exit, press ENTER button until normal display returns. To exit diagnostic menu

at any point in the menu, press and hold ENTER button for three seconds. Diagnostic menu

will remain on display for 10 minutes after the last keystroke, then automatically revert to

normal operation mode (cabinet temperature display). All information given in degrees will

automatically convert to the appropriate programmed scale (Fahrenheit vs. Celsius).

DISPLAY DEFINITION

1OFF Displays Cabinet Temperature.

1 ON Displays Evaporator Temperature. Display will automatically revert to

cabinet sensor after five minutes.

[FREEZER ONLY]

2OFF Manual defrost initiation option not activated.

2 ON Manual defrost initiation option activated. Control will begin defrost cycle

once user returns to operating mode by cycling through menus. Manual

defrost does not eliminate or change times on any scheduled defrost

cycles.

3OFF Unconditional alarm reset option not activated.

3 ON Unconditional alarm reset option activated. Changing from 3OFF to 3 ON

resets all alarm display codes, all at the same time. This is a complete

clearing of alarms.

4 16 Number in right two digits represents Compressor run time in last 24 hours

to the nearest hour. Example: 16 hours total run time in the last 24 hours.

Value is every 24 hours.

18

5 50 Number in right two digits represents percent Compressor on time for the

last 5 run cycles. A run cycle begins when the Compressor switches from

off to on and ends the next time it switches from off to on. Example: 50%

run time over the last 5 run cycles.

Value is calculated as follows: Percent on time=On time last 5 cycles/total

time last 5 cycles.

Note: “On time last 5 cycles” does not include an on time that was

terminated by a defrost cycle or the first on time after a defrost,

and “Total time last 5 cycles” does not include an on or off time

that was terminated by a defrost cycle, the time spent in defrost

or the first on time after a defrost.

Value is saved every 5 cycles.

6 45 Number in right three digits represents Compressor run time for the last

run cycle. Example: 45 minutes of Compressor run time in last run cycle.

7 45 [FREEZER ONLY]

Number in right two digits represents length of time for the last defrost

cycle in minutes. Example: 45 minutes in last defrost cycle.

8 67 Number in right two digits represents highest temperature recorded during

the last high temperature alarm. Example: Temperature reached 67

degrees during last high temperature alarm. Display will “8--” if there has

not been a high temperature alarm.

Value is saved every 8.5 minutes when in alarm.

9-10 Number in right three digits represents lowest temperature recorded during

the last low temperature alarm. Example: Temperature reached

-10 degrees during the last low temperature alarm. Display will show “9--” if

there has not been a low temperature alarm.

Value is saved every 8.5 minutes when in alarm.

The diagram below is an example of a run cycle:

19

Evercheck Display Board

IF DISPLAY REASON

READS

dEF UNIT IN DEFROST OR RECOVERY PERIOD. NO TEMPERATURE DISPLAY.

CF AIR FILTER ELEMENT NEEDS CLEANING.

door DOOR OPEN. (EXCLUDING GLASS DOOR MODELS)

E1 FOR FREEZERS WITH BOARD REVISION LEVEL 10 OR BELOW AND FOR ALL

REFRIGERATORS, when cabinet temp. has exceeded set temp. by 10°F or more

for more than 2 hours;

OR FOR FREEZERS WITH BOARD REVISION LEVEL 11 AND ABOVE, when cabinet

temp. has exceeded set temp. by 25°F or more for more than 2 hours,

E2 CABINET TEMPERATURE 8°F BELOW SETPOINT FOR 1 HOUR OR

MORE.

E3 [FREEZER ONLY] DEFROST DID NOT TERMINATE WITHIN 1 HOUR.

E4 HIGH PRESSURE ALARM. UNIT OPERATING ON HIGH PRESSURE

SWITCH. CALL FOR SERVICE.

E6 HIGH VOLTAGE ALARM. LINE VOLTAGE IN HIGHER THAN RATED VOLTAGE.

E7 LOW VOLTAGE ALARM. LINE VOLTAGE LOWER THAN RATED VOLTAGE.

E8 CABINET TEMPERATURE SENSOR FAILURE.

E9 DEFROST TEMPERATURE SENSOR FAILURE.

E10 COMMUNICATION ERROR.

20

13. CONTROL BOARD

1) A HOSHIZAKI exclusive solid-state control is employed in all Hoshizaki refrigerators and freezers.

2) A Printed Circuit Board (“Control Board”) includes a stable and high quality control system.

3) All models are pretested and factory-adjusted.

CAUTION

1. Fragile, handle very carefully.

2. A controller board contains integrated circuits, which are susceptible to failure due to

static discharge. It is especially important to touch the metal part of the unit when

handling or replacing the board.

3. Do not touch the electronic devices on the board or the back of the board to prevent

damage to the board.

4. Do not fix the electronic devices or parts on the board in the field.

Always replace the whole board assembly when it goes bad.

5. Do not short out power supply to test for voltage.

6. Keep the Thermistors, Clean Filter leads, Door Switch leads, Pressure Switch leads

and Ribbon Cable at least 1 1/2” away from high voltage leads (AC 100 volts or

more) to protect against electrical noise.

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Hoshizaki American, Inc. RFH3-SSB-J-2 User manual

Hoshizaki American, Inc. RFH3-SSB-J-2 User manual

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