Mitsubishi MUZ-A18YV Service Manual page 40

• When the operation frequency does not go up from lowest frequency.
H H Check of HPS
MUZ-A26YV
Start
1. Disconnect the connector CN681 in the electronic control P.C. board.
2. Check the resistance of HPS after 1 minutes have passed since the outdoor unit power supply was turned off.
Check the resistance between
each terminal.
0"
Reconnect CN681.
Turn on power supply to the indoor and outdoor unit.
3 minutes later, starts EMERGENCY OPERATION.
Is HPS protection displayed
immediately after compressor
starts?
Yes
Normal
Infinity
Replace HPS.
No
Replace the electronic control P.C. board.
40