Midea M-Thermal Series Service Manual page 72

4.19 P6 Troubleshooting for single‐phase models
Digital display output
Description
 Inverter module protection.
 M‐Thermal Split stops running.
 Error code P6 is displayed on the user interface. Specific error code L0, L1, L2, L4, L5, L7, L8 or L9 is displayed on the
outdoor unit main PCB.
Possible causes
 Inverter module protection.
 DC bus low or high voltage protection.
 MCE error.
 Zero speed protection.
 Phase sequence error.
 Excessive compressor frequency variation.
 Actual compressor frequency differs from target frequency.
Specific error codes for P6 inverter module protection
If a P6 error code is displayed on the user interface, one of the following specific error codes is displayed on the outdoor
unit main PCB: L0, L1, L2, L4, L5, L7, L8, L9. Refer to Table 4‐4.1.
Table 4‐4.1: Specific error codes for error P6
Specific error code
L0
L1
L2
L4
L5
L7
L8
L9
The specific error codes can also be obtained from the LED indicators LED1/LED2 on the inverter module. Refer to Figure
4‐4.2 and Figure 4‐2.4 or 4‐2.6 in Part 4, 2.1 "Outdoor Unit PCBs".
201909 71
Inverter module protection
DC bus low voltage protection
DC bus high voltage protection
MCE error
Zero speed protection
Phase sequence error
Compressor frequency variation greater than 15Hz within one second protection
Actual compressor frequency differs from target frequency by more than 15Hz protection
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Content
M‐Thermal Split