Midea M-Thermal Series Service Manual page 60

4.13 H8 Troubleshooting
Digital display output
Description
 Pressure sensor error.
 M‐Thermal Split stops running.
 Error code is displayed on outdoor unit main PCB and user interface.
Possible causes
 Pressure sensor not connected properly or has malfunctioned.
 Outdoor unit main PCB is damaged.
Procedure
High pressure sensor connection on
outdoor unit main PCB is loose
High pressure sensor has short‐circuited
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 on each type of outdoor unit main PCB is labeled in Figure 4‐2.2 in Part4, 2.3 "Main PCBs for Refrigerant System,
Inverter Module".
201909 59
H8
No
No
1
or failed
No
Midea CAC Confidential
Yes
Ensure the sensor is connected properly
Yes
Replace the sensor
M‐Thermal Split