Hoshizaki HUR68A(-D), HWR40A(-D) c. Defrost Alarm E3, d. High Pressure Alarm E4, Reset Options

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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