M thermal Mono
56 202008
Midea M thermal Mono
4.14 H8 Troubleshooting
Digital display output 4.14.1
Description 4.14.2
Pressure sensor error.
M thermal Mono stops running.
Error code is displayed on outdoor unit main PCB and user interface.
Possible causes 4.14.3
Pressure sensor not connected properly or has malfunctioned.
Outdoor unit main PCB is damaged.
Procedure 4.14.4
H8
No
High pressure sensor connection on
outdoor unit main PCB is loose
Yes
Ensure the sensor is connected properly
No
High pressure sensor has short-circuited
or failed
1
Yes
Replace the sensor
No
Replace outdoor unit main PCB
Notes:
1. Measure the resistance among the three terminals of the pressure sensor. If the resistance is of the order of mega Ohms or infinite, the pressure sensor
has failed. The pressure sensor connection is port CN6 on the outdoor unit refrigerant system main PCB (labeled 3 in Figure 4-2.2).
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