37
Digital tester
Normal resistance value
Digital tester
Normal resistance value
(+)Red
(-)Black
∞
(Several M
Ω)
(+)Red
(-)Black
∞
(Several M
Ω)
P
N
U
N
U
V
V
W
W
(+)Red
8.2.7 IPM malfunction or IGBT over-strong current protection diagnosis and solution(P0)
Error Code
P0
Malfunction decision
conditions
When the voltage signal that IPM send to compressor drive chip
is abnormal, the display LED will show “P0” and AC will turn off.
Supposed causes
●
Wiring mistake
●
IPM malfunction
●
Outdoor fan ass’y faulty
●
Compressor malfunction
●
Outdoor PCB faulty
Trouble shooting:
Check the wiring between main PCB
and compressor. Are the wires and
connectors broken?
Yes
Correct the connection or
replace the wires and
connectors.
No
IPM continuity check. Check if the
IPM terminal resistance values are
uniform.
Replace the IPM board or replace the
main PCB if the IPM board and main
PCB are integrated together.
Yes
Check if the outdoor fan runs
properly or the outdoor unit
ventilation is good.
Please refer to the solution of “Fan Speed Has Been
Out Of Control” malfunction.
Yes
Check if the compressor resistance
values are uniform .
Replace the compressor.
Yes
Replace the outdoor main PCB if the
main PCB and IPM are separate.
I
PM continuity check
Turn off the power, let the large capacity electrolytic capacitors discharge completely, and dismount the IPM. Use a
digital tester to measure the resistance between P and UVWN; UVW and N.
No
No
No
Summary of Contents for DA1221-H2-I
Page 1: ...DuctlessAire ES Series Service Manual 2016 ABSSA B4 1601 ...
Page 8: ...6 For DA1221 H2 I For DA1821 H2 I DA2421 H2 I ...
Page 10: ...8 For DA1221 H2 O ...
Page 11: ...9 For DA1821 H2 O ...
Page 12: ...10 For DA2421 H2 O ...
