Hoshizaki RF28A, Руководство по обслуживанию

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c) Defrost Alarm (E3)
If the defrost thermistor does not terminate defrost 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.
• Trouble with the defrost thermistor (orange) or safety defrost thermostat; the defrost
thermal fuse is blown.
Note: The safety defrost thermostat and defrost thermal fuse are backup safeties for the
defrost thermistor.
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.