Mitsubishi Electric PUHY-HP144TSHMU-A Service Handbook page 154

[ IX Troubleshooting ]
1. Error Code
5110
Heatsink temperature (THHS) fault (Detail code 01)
2. Error definition and error detection method
When a short or an open of THHS is detected just before or during the inverter operation.
3. Cause, check method and remedy
Cause
(1) THHS sensor failure
(2) Contact failure
(3) INV board failure
Refer to section - 6 - "Inverter" under part [4] "Trouble shooting principal parts" for error codes related to the
inverter.(page 196)
1. Error Code
5201
High-pressure sensor fault (63HS1)
2. Error definition and error detection method
If the high pressure sensor detects 0.098MPa [14psi] or less during the operation, the outdoor unit stops once, turns to anti-
restart mode for 3 minutes, and restarts after 3 minutes when the detected high pressure sensor is 0.098MPa [14psi] or more.
If the high pressure sensor detects 0.098MPa [14psi] or less just before the restart, the outdoor unit makes an error stop, and
the error code "5201" will appear.
During 3-minute antirestart mode, preliminary errors will be displayed on the LED display.
A error is not detected for 3 minutes after the compressor start, during defrost operation, or 3 minutes after defrost operation.
3. Cause, check method and remedy
(1) High pressure sensor failure
(2) Pressure drop due to refrigerant leak
(3) Torn wire coating
(4) A pin on the male connector is missing or contact failure
(5) Disconnected wire
(6) High pressure sensor input circuit failure on the control board
HWE0716A
Check the THHS sensor reading on the LED monitor. Replace the
sensor if it reads below - 30°C[-22°F] or avobe 150°C[302°F].
Check the connector connection (CNTH) on the INV board.
If the problem recurs when the unit is put into operation, replace
the INV board.
Cause
- 145 -
Check method and remedy
Check method and remedy
Refer to the page on the troubleshooting of
the high pressure sensor.
(9 [4] -1- (page 188))
GB