40
8.2.10 Inverter compressor drive error diagnosis and solution (P4)
Error Code
P4
Malfunction decision
conditions
An abnormal inverter compressor drive is detected by a special detection circuit,
including communication signal detection, voltage detection, compressor rotation
speed signal detection
and so on.
Supposed causes
●
Wiring mistake
●
IPM malfunction
●
Outdoor fan ass’y faulty
●
Compressor malfunction
●
Outdoor PCB faulty
Trouble shooting:
Check if the wiring between main
PCB and compressor connected
well?
Correct the connection or
replace the wires and
connectors.
Yes
Check if the IPM is installed correctly.
Correct the installation,
tighten the screws and apply
silicon grease.
Yes
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.
Yes
Yes
Yes
Yes
Yes
No
No
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 ...
