Rheem RHMV2421MNACJA Service Manual page 90

Troubleshooting 29
Discharge temperature error
Detective actuators:
Discharge temperature thermistor
Detective details:
"Protection stop by
"discharge temperature ≥ 239°F (115°C)
(1736/1748 models 230°F (110°C))
during compressor operation"
generated 2 times within 24 hours.
Forecast of cause:
1. 3-way valve not opened
2. EEV defective, strainer clogged
3. Outdoor unit operation failure, foreign matter on condenser coil
4. Discharge temperature thermistor failure
5. Insufficient refrigerant
Cooling operation
If the 3-way valve(gas side) was closed, open the
3-way valve(gas side) and check operation.
OK
Check Point 2 : Check the EEV, strainer
EEV open?
Strainer clogging check
(before and after EEV, ACM, oil return)
(Parts information 3)
OK
Check Point 3 : Check the outdoor unit fan, condenser coil
Check for foreign object at condenser coil
Check if fan can be rotated by hand.
(Parts information 4)
Motor check
OK
Check Point 4 : Check the discharge thermistor
Discharger thermistor characteristics check
(Check by disconnecting thermistor from PCB)
refer to the "Troubleshooting 18".
OK
Check Point 5 : Check the refrigerant amount
Leak check
Indicate or Display:
Indoor unit
Operation lamp: 10 times Flash,
Timer lamp
Wired remote control
Error code : [E : A1]
Outdoor unit (RP1736/1748HJVXA)
Mode Error
2
: Light OFF
Heating operation
Check Point 1 : Check if 3-way valve(liquid side) is open.
If the 3-way valve(liquid side) was closed, open the
3-way valve(liquid side) and check operation.
OK
Check Point 2 : Check the EEV, strainer
EEV open?
Strainer clogging check
(before and after EEV, ACM, oil return)
(Parts information 3)
OK
03-40
: 1 time Flash
A B C D E
10
1
: Light ON n : n times blinking
F