Rheem RHMV2421MNACJA Service Manual page 80

Troubleshooting 23-1
High pressure switch error
(RP1724/1730HJVXA)
Detective actuators:
High pressure switch
Detective details:
When power is turned on,
"high pressure switch : open" is detected.
Forecast of cause:
1. High pressure switch connector
disconnection, open
2. High pressure switch characteristics failure
3. Main PCB failure
Check Point 1 : Check the high pressure switch connection state
Connector and wiring connection state check
Cable open check
OK
Check Point 2 : Check the high pressure switch characteristics
Switch characteristics check
* For the characteristics of high pressure switch, refer to below.
OK
Check Point 3 : Replace main PCB
Change main PCB, and execute check operation again.
Type of contact
C
H
Pressure
Characteristics of pressure switch
Contact : Short Open
Contact : Open Short
Pressure switch
4.2 0.1MPa
3.2 0.15MPa
03-30
Indicate or Display:
Indoor unit
Operation lamp: 8 times Flash,
Timer lamp
Wired remote control
Error code : [E : 86]
Outdoor unit : No indication
CN90
: 6 times Flash