Communication Abnormal Between Pcb And Ipm; Dc Voltage Or Ac Voltage High - Haier 2U18MS2VHB Service Manual

Ductless multi-split heat pump, outdoor/indoor, wall mount - highwall, 2'x2' compact cassette, 3'x3' large cassette, slim duct, mid-static ducted, medium static ducted, console
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[4] Communication abnormal between PCB and IPM

Control board can not
communicate with the
compressor driver module for
over 4 minutes
Possible causes:
• The communication wire is bad
• The PCB is bad
• The power module is bad

[6] DC voltage or AC voltage high

Driver module AC power supply voltage over 280VAC,
or driver module DC-BUS voltage over 390VDC.
Possible causes:
• The power supply is abnormal
• Incorrect wiring
• Power module is bad
Flow Charts
Topic Title
Is the compressor drive module
input power normal (Test the
AC power supply voltage of the
module's power input ACL-ACN:
normal value should between 196-
253VAC)?
Yes
Check the AC voltage between
the two terminals of power filter
board board P7& the terminal 3
of relay RL1 (208-230VAC)
Abnormal
Check if the output of main
control board CN6,CN34 are
both DC 12V
No
The filter board is broken,
replace the filter board
Is power supply voltage
Is electric box wiring
Is power module voltage
between terminal P&N more
than 390V or less than 160V
during operation?
Check rectifier, rector,
electrolytic capacitor on
inverter main circuit
TROUBLESHOOTING & REFERENCES
No
Is the AC power supply wire
Normal
between compressor drive
module and filter
board firmly connected?
No
No
normal?
Yes
No
correct?
Yes
No
Yes
Adjust communication wire
No
Fix wiring
Main control board
is bad, replace.
Correct power supply
Correct the wiring
Replace power
module
J-21

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