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Compressor doesn’t work.
Check the power supply.
Check whether the voltage is too high or too low.
No
Check the wiring.
Check whether the compressor is in overload protection mode.
Check whether the relay of compressor in PCB works normally (Start the uni t, wait 3 m inutes
for the compressor to turn on, and set the unit in the cool mode and 26F (17C). Then check the
output of relay and replace the PCB if failed.
Check whether the external
protector works normally.
Remove t he overl oad p rotector a nd cool t o
normal temperature. Then che ck whether it is
open circuit. Replace if failed.
Comparing with compressor specification, check the resistance of compressor.
Replace the compressor.
No
Check whether the indoor temperature is lower than 59F (15°C).
No
No
No
No
No
Service Manual
Room Air Conditioner with R-410A
Heat Controller, Inc.
21