Rheem RHMV2421MNACJA Service Manual page 89

Troubleshooting 28
Coil (expansion valve) error
Detective actuators:
EEV coil
Main PCB
Detective details:
When the power is turned on and
When the data of the automatic correction was
damaged
Forecast of cause:
1. EEV coil loose connection
2. EEV wires cut or pinched
3. Defective EEV coil
4. Main PCB (DC12V) output abnormal
Check 1 : Check the connection of EEV connector
Check if the connector is loose connection or not.
OK
Check 2 : Check the EEV wire
Check if the wire of EEV has damage or not.
(Slash, Braking of wire, Pinching, etc.)
OK
Check 3 : Check the EEV Coil
Check if the circuit of EEV coil winding is good or not.
(Refer to the service parts information 3)
OK
Check 4 : Check the output of EEV on the Main PCB
Check if the DC12V is on between the Pin No.1 of CN111 and GND Pin.
(Disconnect the wire of EEV when you check the output of EEV)
OK
Check 5 : Noise, momentary open, voltage drop
Check if temporary voltage drop was not generated.
Check if momentary open was not generated.
Check if ground is connection correctly or there are no related cables near the power line.
Indicate or Display:
Indoor unit
Operation lamp: 9 times Flash,
Timer lamp
Wired remote
Error code : [E : 9A]
Outdoor unit (RP1736/1748HJVXA)
Mode Error
2
: Light OFF
Replace EEV Coil
NG
Replace EEV Coil
NG
NG
Replace Main PCB
03-39
: 10 times Flash
A B C D E F
9 10
: Light ON n : n times blinking