Carrier 40MPHA - Page 29

29
DIAGNOSIS AND SOLUTION (CONT)
P1 (Over voltage or too low voltage protection diagnosis and solution)
Description: Abnormal increases or decreases in voltage are detected by checking the specified voltage detection circuit.
Recommended parts to prepare:
S Power supply issues
S System leakage or blockage
S Faulty PCB
Troubleshooting and Repair:
Check the power supply
Is it in working order ? Turn o the unit.
NO
Check the connections and wires
YES
Are they in working order ?
Ensure proper connections or
replace the wires
NO
Power on and measure the
voltage between P and N
YES
Wh ile the unit is i n standby,
is the voltage between P and N around
DC 310 V, 340 V or 380 V? On unit start up
is the unit in the
220
V~
400 V
range?
Replace the IPM boardNO
Check the reactor
YES
Is it in working order ?
Replace outdoor PCBNO
Replace the reactor
YES