Carrier 38MBQ Series - Voltage Protection Diagnosis; Troubleshooting P1 Error

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DIAGNOSIS AND SOLUTION (CONT)
Table 24—Over Voltage or Too Low Voltage Protection Diagnosis and Solution (P1)
Error Code P1
Malfunction Decision Conditions An abnormal current rise is detected by checking the specified current detection circuit.
Supposed Causes
S Power supply problems
S System leakage or blockage
S PCB faulty
Troubleshooting
Check the power supply. Is it
in working order?
Check the connections and
w i r e s . Are they in working
order?
Turn off the unit
No
Yes
No
Ensure proper connections or
replace the wires
Yes
Replace the reactor
Yes
No Replace the IPM board
Turn power on and while the unit is in
standby, check if the voltage between P
and N is at DC 310V, 340V or 380V?
Then start up the unit and measure the
voltage between P and N. Is it in now
between 220V~400V?
Check the reactor. Is it in
working order?
Yes
No
Replace outdoor main PCB