R407C CCU Technical Manual MCAC-UTSM-2012-05
72
2. Trouble shooting
About the Fault of temperature sensor, high pressure protection, low pressure protection. Please refer
to the following:
Fault of temp. sensor
Judge 1: Whether the sensor is break
off.
Connects it well.
Yes
Judge 2: Whether the sensor is
malfunction.
Validate: Short-connect the outdoor
ambient temperature sensor, check
whether it can run normally
Replace it.
Yes
No
No
Judge 3: PCB is malfunction
Replace PCB
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