Carrier 40MPHA Service Manual page 34

DIAGNOSIS AND SOLUTION (CONT)
F0 (Overload current protection diagnosis and solution)
Description: An abnormal current rise is detected by checking the specified current detection circuit.
Recommended parts to prepare:
S
Power supply problems
S
System blockage
S
Faulty PCB
S
Wiring mistake
S
Compressor malfunction
Troubleshooting and Repair:
Check the power supply
Is it in working order ?
Check system for blockages .
Do any exist?
Check the compressor resistance values
Are they within acceptable
parameters?
Check the connections and wires
Are they properly connected ?
Check the reactor
Is it in working order ?
Replace the outdoor unit
NO
YES
NO
YES
YES
YES
YES
Stop the unit .
Clear the blockage
NO Replace the compressor .
Ensure proper connections or
NO
replace the wires .
NO Replace outdoor PCB
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