Rheem RHMV2421MNACJA Service Manual page 72

Troubleshooting 15
Inverter error
Detective actuators:
Inverter PCB
Detective details:
Error information is received
from outdoor unit inverter PCB
Forecast of cause :
1. External cause.
2. Power supply to filter PCB to inverter PCB
wiring disconnection, open
3. Filter PCB failure
4. Inverter PCB failure
Check Point 1-1 :
Turn power on again?
Error displayed again?
YES
Check Point 2 : Check the wiring (power supply to filter PCB to inverter PCB)
Connector and wiring connection state check
Cable open check
OK
Check Point 3 : Replace filter PCB (INV) and inverter PCB
Replace filter PCB, main PCB and inverter PCB.
Check Point 1-2 : External cause
Check if temporary voltage drop was not generated.
NO
Check if temporary open was not generated.
Check if ground is connected correctly
or there are no related cables near the power line.
03-22
Indicate or Display:
Indoor unit
Operation lamp: 6 times Flash,
Timer lamp : 3 times Flash
Wired remote
Error code : [E : 63]
Outdoor unit (RP1736/1748HJVXA)
Mode Error A B
2 6 3
: Light OFF : Light ON
C D E F
n : n times blinking