Kaisai 06RY1, Service Manual

Page: 71 / 114

M thermal Mono
70 200208
Midea
M
ther
ma
l Mo
no
Se
rvice M
an
ual
4.13 H7 Troubleshooting
Digital display output 4.13.1
Description 4.13.2

Abnormal main circuit voltage.

Mono stops running.

Error code is displayed on refrigerant system main control board for refrigerant system and user
interface.
Possible causes 4.13.3

Power supply voltage not within ±10% of rated voltage or a phase is missing.

Outdoor unit powered on immediately after being powered off.

Loosened wiring within electric control box.

High voltage circuit error.

Main PCB damaged.
Midea CAC Confidential
M thermal Mono
202008 71
Procedure 4.13.4
H7
Power supply voltage is not within ±10%
of rated voltage or a (on 3-phase models)
phase is missing
Yes
Provide normal power supply
No
Wires between refrigerant system main
PCB, AC filter board (on 3-phase models)
and electric control box power supply
terminals are loose
Yes
Ensure the wires are connected properly
No
Outdoor unit powered on immediately
after being powered off
Yes
Power-off the unit and wait for at least 3
minutes before powering-on
No
High voltage circuit error has occurred,
such as the compressor has
malfunctioned, the fan motor has
short-circuited, or the inverter module
has short-circuited
Yes
Replace or repair the relevant parts
No
Replace refrigerant system main PCB
Midea CAC Confidential
Mono