Hoshizaki HUR68A(-D) Rear, Front, Relay Wiring Harness K311, Thermistor Wiring Harness K151

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2. Control Board Layout

Rear

K311 (6 pin)

Relay Wiring Board Part

Harness Number

Board Part

Number

Chip Revision

K251 (5 pin) (not used)

K101 (3 pin)

Transformer

K151 (10 pin)

Thermistor

Wiring

Harness

F101	K361 (9 pin)
3 Amp Fuse	(not used)
(not used)

Front

SW 135 SW 134

Display Raise

Setpoint Setpoint

LED 123

Lit for

Negative

Values

LED 124

Temperature

and Alarm

Display

Relays (not used)

SW 133

Lower

Setpoint

SW 132

Manual

Defrost

SW 131

Energy

Saving/

Service

Button

Note: Fuse at position F101 on board is not currently used. The board can function without this fuse.

Relay Wiring Harness (K311)

(brown) Compressor Relay

(red) Evaporator Fan Relay

(orange) Defrost Heater Relay

Thermistor Wiring Harness (K151)

(gray) Clogged Filter Sensor

(orange) Defrost Thermistor

(black) Cabinet Thermistor

(white) Jumper Wire (limits access to settings and diagnostics menu - not present on all units)

(light blue) High Pressure Switch

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Contents Superior Degree Reliability Energy Star Contents Page Dimensions Specifications Nameplate RatingsUndercounter Model Names HUR40A, HUF40A Units mm 1a. HUR40A-D, HUF40A-D HWR40A, HWF40A 2a. HWR40A-D, HWF40A-DHUR68A, HUF68A 3a. HUR68A-D, HUF68A-DHWR68A, HWF68A 4a. HWR68A-D, HWF68A-DHUR96A Units mm 5a. HUR96A-D HWR96A Units mm 6a. HWR96A-D II. General Information Construction Evaporator CaseRefrigerators Continuous Operating Mode Sequence of Operation and Timing ChartsSequence of Operation Timing Chart OperatingFreezers Continuous Operating Mode Freezers Continuous Refrigerators Energy Saving Operating Mode Defrost End Defrost thermistor reaches defrostEnergy Freezers Energy Saving Operating Mode Board Self Check Minute DelayFreezers Energy Start-Up Delay Control BoardRear Relay Wiring Harness K311Thermistor Wiring Harness K151 FrontSettings and Diagnostics Gaining Access to Settings and DiagnosticsSwitching the Display Between Fahrenheit and Celsius F5 Temperature DisplayAdjusting the Setpoint Temperature Cabinet Temperature Correction calibration factor Settings and Diagnostics Menu Later SectionDefrost Termination Temperature F1 Defrost Interval F0Setpoint Temperature Differential F2 High Temperature Alarm Delay Time F3 Low Temperature Alarm Delay Time F4Temperature Display Scale F5 Alarm History F6Compressor Run Time F7 Operating ModesContinuous Perimeter Frame HeaterEnergy Saving III. Service Diagnosis Alarm Codes Alarm Signals Alarm Code ProblemAlarm Display Priority Error Code Priority DescriptionReset Options Alarm Details and CountermeasuresHigh Temperature Alarm E1 Possible CausesLow Temperature Alarm E2 Defrost Alarm E3 High Pressure Alarm E4Clogged Filter Alarm E7 Defrost Temperature Sensor Malfunction Alarm E8 Clogged Filter Sensor Malfunction Alarm E9 Control Board Error Alarms EA and ED Diagnosis Chart Problem Possible Cause RemedyProblem Possible Cause Remedy Problem Possible Cause Remedy Thermistor Check Refrigerant Recovery IV. Removal and Replacement of ComponentsService for Refrigerant Lines BrazingEvacuation and Recharge Removal and Replacement of Refrigeration Unit Removal and Replacement of CompressorRemoval and Replacement of Evaporator Page Page Defrost Thermistor Removal and Replacement of ThermistorsCabinet Thermistor Clogged Filter Thermistor sensorRemoval and Replacement of Door Gasket Removal and Replacement of Defrost HeaterRemoval and Replacement of Control Board Condenser Fan Motor Removal and Replacement of Fan MotorsDoor Re-Hinging and Drawer Conversion Evaporator Fan MotorCleaning and Maintenance Instructions CleaningShelves MaintenanceAir Filter Drawers115/60/1 A2. HUR40A-D, HWR40A-D auxiliary code Q6 and later HUF40A-D, HWF40A-D C1. HUR68A, HWR68A auxiliary code Q5 and earlier C2. HUR68A-D, HWR68A-D auxiliary code Q6 and later HUF68A-D, HWF68A-D HUR96A-D, HWR96A-D