Chapter Ⅳ Maintenance（2. Troubleshooting）
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2.1.3 High discharge temperature protection
High discharge temperature protection
Yes
High discharge temperature protection
Check if the electronic expansion valve
can operate normally
No
Measure if the sensor resistance is correct
Yes
The main board fails. Replace the main board
No
Replace the discharge temperature
sensor
Replace the expansion valve coil or the valve
No
Check if the temperature decrease or
pressure decrease before and after the filter or
another component is too large
The system pipeline leaks. Repair the leakage hole,
and add refrigerant according to the original quantity
No
The system is blocked up. Replace the related
component
Yes
Yes
Yes
2.1.4 Water level switch error of the unit
Water level switch error
Yes
The switch signal cable falls off
No
Disconnect power; reconnect the
cable and then turn power on
Check which float ball of liquid
level fails
2-digit water level
switch fails
4-digit water level
switch fails
Replace the 2-digit water
level switch
Check whether other two float balls are
available. If yes, replace the float ball. If not,
replace the 4-digit water level switch
Yes
2.1.5 Water flow switch protection
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