Alarm Code E3: Ultralow Room Temperature; Alarm Code E4: Room Temperature Sensor Failure - S&A CW-5000 Series Service And Repair Handbook

6）Compressor Rotor not working
Observe weather the compressor is vibrating when thermostat reaches refrigeration status (D2 of
thermostats light on). If there is no vibration of compressor and surface of compressor got heating, it
means the interior of compressor malfunction.
Solution: Replace compressor

Alarm code E3: ultralow room temperature

Reason:
E3 alarm display is normal at first use when the ambient temperature is low (such as winter and
autumn season), just add certain warm water the temperature will restore to working temperature.

Alarm code E4: room temperature sensor failure

Reason:
1、Connected wires loose
2、Sensor failure
Testing method
1) Look for the terminals of room temperature sensor and water temperature sensor (as picture),
swap and connect terminals of the room temperature sensor and water temperature sensor to the
temperature controller.
1.1） If the alarm stops can be judged as the terminals poor contact, and then reconnect the wires back
9