Midea ESG-Inv M Series - Hb Three Times PP Protection and TW-Out below

ESG-Inv M
50
Midea ESG-Inv M Series Pool Heat Pump Manual
5.18 Hb, PP Troubleshooting
Digital display output
Procedure
Hb: Three times PP protection and TW-
out below 7 ℃
PP: |TW-out-TW-in| abnormal
protection
Temperature sensor is not installed
Yes
Installed the temperature sensor
No
Temperature sensor connection
1
on main
PCB is loose
Yes
Ensure the sensor is connected properly
No
Temperature sensor is affected by
moisture or water
Yes
Dry the sensor
No
Temperature sensor has short-circuited
or failed or big temperature drift
Yes
Replace the sensor
No
The coil or plug of 4-way valve are not
connected properly
Yes
Ensure coil or plug of 4-way valve are
connected properly
No
4-way valve is blocked or damaged
2
Yes
Replace the 4-way valve
No
Replace refrigerant system PCB
Note:
1. Inlet water temperature sensor(TW-in), outlet water temperature sensor(TW-out) connection are port CN10 on the refrigerant system PCB.
2. Restart the unit in cooling mode to change the refrigerant flow direction. If the unit does not operate normally, the 4-way valve is blocked or damaged.
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