Rheem RHMV2421MNACJA Service Manual page 65

Troubleshooting 10
Indoor unit communication circuit (WRC) error
Detective actuators:
Wired remote control (2-wire)
Indoor unit controller PCB circuit
Detective details:
When the indoor unit(s) detects the configuration of RCG abnormal or
the indoor unit detects lack of primary -remote control.
Forecast of cause:
1. Terminal connection abnormal
2. Wired remote control failure
3. Indoor unit controller PCB defective
Check Point 1 : Check the connection of terminal
After turning off the power supply, check & correct the followings
Indoor unit - Check the connection of terminal between
remote control and indoor unit, or between indoor units and
check if there is a disconnection or short of the cable
Check Point 2 , 3: Check Indoor unit controller PCB
Check terminal voltage of controller PCB connector CN300 (Power supply for remote controller)
If DC12V, Remote control failure (Controller PCB is OK) >>> Replace remote controller
If DC0V, Controller PCB failure (Remote is OK) >>> Replace controller PCB
In case of re-installation is done due to removed connector or incorrect wiring,
turn on the power again.
Indicate or Display:
Indoor unit
Operation lamp: 3 timesFlash,
Timer lamp
Wired remote control
Error code
Outdoor unit (RP1736/1748HJVXA)
Mode Error
2
: Light OFF
03-15
: 10times Flash
: [E : 3A]
A B C D E
5 15
: Light ON n : n times blinking
F