Mitsubishi Electric PEFV-P72NMHSU-E Technical & Service Manual page 54

2. Troubleshooting the inverter output-related problems
Check items
[1] (1) Turn off the breaker.
Check the
Be sure to turn off the
INV board
breaker.
error detec-
(2) Disconnect the connec-
tion circuit.
tor CNINV from the INV
(unloaded)
board.
(3) Turn on the breaker.
(4) Operate the indoor
units.
[2] (1) Turn off the breaker.
Check the
Be sure to turn off the
inverter for
breaker.
damage.
(unloaded)
(2) Disconnect the connec-
tor CNINV from the INV
board.
(3) Turn SW2-1 on the INV
board to ON.
(4) Turn on the breaker.
(5) Operate the indoor
units.
The units will operate for
approximately 30 sec-
onds unloaded and then
stop.
Error code:4255
During the unloaded op-
eration, a constant line
voltage of approximately
20V will be output.
HWE1017B
Symptoms
1) Overcurrent errors
Error code:4255
2) Logic error
Error code:4225
3) ACCT sensor circuit failure
Error code:5305
4) Position detection error
Error code:4255
5) Open-circuited IPM or dis-
connected ACCT sensor
Error code:5305
1) An error is detected in less
than 30 seconds of startup.
(LED2 on the INV board
lights up.)
2) The line voltage imbalance
is 5V or greater.
3) There is no line voltage im-
balance.
An error is detected after 30
seconds of startup (LED2
on the INV board lights up.),
and the units will stop.
- 48 - 48
Actions to take
Replace the INV board.
Replace the INV board.
Replace the INV board.
If the problem described at left happens
when the power is turned on for the first
time, replace the INV board.
Removing the connector CNINV while
the power is turned on can cause the
problem described at left. Be sure to
turn off the power before disconnecting
the connector CNINV.
Normal
Replace the INV board.
Replace the INV board.
Normal
Reconnect the CNINV connector, and
set the SW2 back to its original setting
after checking.
GB