Mitsubishi Electric PURY-P120TJMU-A, Service Handbook, Page: 322 / 411

[
IX
Troubleshooting ]
- 313 - HWE0913A GB
Items to be checked Phenomena Remedy
[3]
Check whether
the inverter is
damaged.
(No load) <P72 model> 1) Inverter-related problems are de-
tected. Connect the short-circuit con-
nector to CN6, and go to sec-
tion [1].
(1) Disconnect the inverter
output wire from the ter-
minals of the INV board
(SC-U, SC-V, SC-W). 2) Inverter voltage is not output. Replace the INV board.
(2) Disconnect the short-cir-
cuit connector from CN6
on the INV board. 3) There is an voltage imbalance be-
tween the wires.
Greater than 5% imbalance or 5V Replace the INV board.
(3) Put the outdoor unit into
operation.
Check the inverter output
voltage after the inverter
output frequency has sta-
bilized. 4) There is no voltage imbalance be-
tween the wires. Normal
*Reconnect the short-circuit
connector to CN6 after
checking the voltage.
<P96, P120 models> 1) Inverter-related problems are de-
tected. Turn off SW1-1 and go to [1]
(1) Disconnect the inverter
output wire from the out-
put terminals (U, V, W) of
the IPM. 2) Inverter voltage is not output. Check the connection be-
tween the IPM and the
CNIPM on the INV board.
Replace the IPM.
If the problem persists, re-
place the INV board.
(2) Turn on SW1-1 on the
INV board. 3) There is an voltage imbalance be-
tween the wires.
Greater than 5% imbalance or 5V Replace the IPM.
If the problem persists, re-
place the INV board.
(3) Put the outdoor unit into
operation. 4) There is no voltage imbalance be-
tween the wires. Normal
*Turn off SW1-1
[TJMU-A]