Carrier 38MBR series Service Manual page 23

DIAGNOSIS AND SOLUTION (CONT)
Error Code
Malfunction decision conditions
Supposed causes
Table 14—Overload Current Protection Diagnosis and Solution (F0)
F0
An abnormal current rise is detected by checking the specified current detection circuit.
S
Power supply problems
S
System blockage
S
PCB faulty
S
Wiring mistake
S
Compressor malfunction
Check the power supply
Yes
Check for system blockage
Yes
Check the compressor
resistance values
Yes
Check the connections and wires
Yes
Check the reactor
Yes
Replace the outdoor unit
No
Stop the unit
No
Clear the blockage
No
Replace the compressor
Correct the connections or
No
replace the wires
.
No
No
Replace the outdoor main PCB
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