Kaisai 06RY1, Service Manual

Page: 65 / 114

M thermal Mono
64 200208
Midea
M
ther
ma
l Mo
no
Se
rvice M
an
ual
4.8 F1 Troubleshooting
Digital display output 4.8.1
Description 4.8.2

Low DC bus voltage.

M thermal Mono stops running.

Error code is displayed on hydronic system main control board for refrigerant system and user interface.
Possible causes 4.8.3

The DC bus voltage is too low.
Procedure 4.8.4
F1
Power supply is abnormal.
Yes
Provide normal power
No
LED light is OK
Yes
Voltage of PN is 380V.
Yes
Check the main board.
No
IGBT voltage is not correct.
Yes
The inverter board is
damaged, change it.
No
The invert board is ok. Check
the rectifier bridge.
Midea CAC Confidential
M thermal Mono
202008 65
4.9 HF Troubleshooting
Digital display output 4.9.1
Description 4.9.2

Refrigerant system EEPROM error.

Mono stops running.

Error code is displayed on refrigerant system main control board for refrigerant system and user
interface.
Possible causes 4.9.3

Refrigerant system main PCB EEPROM is not connected properly.

Refrigerant system main PCB damaged.
Procedure 4.9.4
HF
Refrigerant system EEPROM
1
is not
connected properly
Yes
Ensure the EEPROM is connected
properly
No
Replace refrigerant system main PCB
Notes:
1. Refrigerant system main PCB EEPROM is designated IC23 on the refrigerant system main PCBs (labeled 29 in Figure 4-2.2 in Part 4, 2.3 “Main PCBs for
Refrigerant System, Inverter Modules and Filter Boards”), designed IC13 on the refrigerant system main PCBs (labeled 19 in Figure 4-2.4 in Part 4, 2.2
“Main PCBs for Refrigerant System, Inverter Modules and Filter Boards”), designed IC23 on the refrigerant system main PCBs (labeled 26 in Figure 4-2.6 in
Part 4, 2.2 “Main PCBs for Refrigerant System, Inverter Modules and Filter Boards”).
Midea CAC Confidential
Mono