Hoshizaki HUR68A(-D), HWR40A(-D), HUR96A(-D), HUR40A(-D) Defrost Alarm E3, High Pressure Alarm E4

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c. Defrost Alarm (E3)

If the defrost thermistor does not turn off in one hour after defrost begins, "E3" is displayed. When "E3" is displayed, the next step in the defrost termination process (drain - fan delay ‑ defrost display delay) begins.

Reset Options

To reset the alarm, turn the unit off and then back on.

Possible Causes

•Trouble with the defrost heater.

•The temperature fuse is blown.

•Trouble with the defrost thermistor (orange).

d. High Pressure Alarm (E4)

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 5 or more times in one hour, "E4" will be displayed.

Reset Options

To reset the alarm, turn the unit off and then back on.

Possible Causes

•The condenser air filter is dirty.

•There is blockage or contamination inside the capillary tube or elsewhere in the refrigeration circuit.

•The condenser fan motor is locked or otherwise not functioning.

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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 2a. HWR40A-D, HWF40A-D HWR40A, HWF40A3a. HUR68A-D, HUF68A-D HUR68A, HUF68A4a. HWR68A-D, HWF68A-D HWR68A, HWF68AHUR96A Units mm 5a. HUR96A-D HWR96A Units mm 6a. HWR96A-D Evaporator Case II. General Information ConstructionRefrigerators Continuous Operating Mode Sequence of Operation and Timing ChartsSequence of Operation Operating Timing ChartFreezers Continuous Operating Mode Freezers Continuous Defrost End Defrost thermistor reaches defrost Refrigerators Energy Saving Operating ModeEnergy Board Self Check Minute Delay Freezers Energy Saving Operating ModeFreezers Energy Control Board Start-Up DelayThermistor Wiring Harness K151 Relay Wiring Harness K311Rear FrontGaining Access to Settings and Diagnostics Settings and DiagnosticsSwitching the Display Between Fahrenheit and Celsius F5 Temperature DisplayAdjusting the Setpoint Temperature Cabinet Temperature Correction calibration factor Later Section Settings and Diagnostics MenuDefrost Interval F0 Defrost Termination Temperature F1Setpoint Temperature Differential F2 Low Temperature Alarm Delay Time F4 High Temperature Alarm Delay Time F3Alarm History F6 Temperature Display Scale F5Operating Modes Compressor Run Time F7Continuous Perimeter Frame HeaterEnergy Saving Alarm Signals Alarm Code Problem III. Service Diagnosis Alarm CodesError Code Priority Description Alarm Display PriorityHigh Temperature Alarm E1 Alarm Details and CountermeasuresReset Options Possible CausesLow Temperature Alarm E2 High Pressure Alarm E4 Defrost Alarm E3Clogged Filter Alarm E7 Defrost Temperature Sensor Malfunction Alarm E8 Clogged Filter Sensor Malfunction Alarm E9 Control Board Error Alarms EA and ED Problem Possible Cause Remedy Diagnosis ChartProblem Possible Cause Remedy Problem Possible Cause Remedy Thermistor Check Service for Refrigerant Lines IV. Removal and Replacement of ComponentsRefrigerant Recovery BrazingEvacuation and Recharge Removal and Replacement of Compressor Removal and Replacement of Refrigeration UnitRemoval and Replacement of Evaporator Page Page Cabinet Thermistor Removal and Replacement of ThermistorsDefrost Thermistor Clogged Filter Thermistor sensorRemoval and Replacement of Defrost Heater Removal and Replacement of Door GasketRemoval and Replacement of Control Board Door Re-Hinging and Drawer Conversion Removal and Replacement of Fan MotorsCondenser Fan Motor Evaporator Fan MotorCleaning Cleaning and Maintenance InstructionsAir Filter MaintenanceShelves 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