Mitsubishi PEH series

- 68 -
Abnormal-
ity display
EO
E3
E8
E9
EF
Meaning of abnormality display and
abnormality troubleshooting
Remote controller communica-
tions receive abnormal (remote
controller).
1) When transmission from refriger-
ant address “0” IC is not received
normally even once in 3 minutes,
an abnormality is recognized.
2) When a slave remote controller
does not receive even one signal
in 2 minutes, an abnormality is
recognized.
Remote controller communication
send abnormal (remote controller)
1) When the remote controller can
not confirm that the transmission
circuit is idle in 6 seconds, an ab-
normality is recognized.
2) When the remote controller can-
not complete 30 continuous trans-
missions, an abnormality is rec-
ognized.
Indoor-outdoor communication
receive abnormal
(Outdoor unit)
When the outdoor controller can
not receive normally even once in
3 minutes, an abnormality is rec-
ognized.
Indoor-outdoor communication
send abnormal
(Outdoor unit)
1) When the outdoor controller
detectes reception of 30 consecu-
tive “0” even through “1” was re-
ceived, an abnormality is recog-
nized.
2) When the outdoor controller can
not confirm that the transmission
circuit is idle in 3 minutes, an er-
ror is recognized.
Check code undefined
Displayed when an undefined check
code is received.
Cause
1 Remote controller send/receive
circuit faulty.
2 Refrigerant address “0” indoor control-
ler board send/receive circuit faulty.
3 Noise entered on remote controller
transmission line.
1 Remote controller send/receive circuit
faulty.
2 Noise entered on remote controller
transmission line.
1 Indoor/outdoor connection wire contact
faulty.
2 Outdoor controller board send/receive
circuit faulty.
3 Indoor controller board send/receive
circuit faulty.
4 Noise entered on indoor/outdoor con-
nection wire.
1 Outdoor controller board send/receive
circuit faulty.
2 Noise entered at power supply.
3 Noise entered on indoor/outdoor con-
nection wire.
1 Noise entered on remote controller
transmission line.
2 Noise entered on indoor/outdoor con-
nection wire.
Judgment method and remedy
Perform remote controller diagnosis.
Take the following action based on the di-
agnosed result:
a) [RC OK] display
Remote controller normal.
Turn power off and on and check.
If “H0” remains on for 4 minutes or
longer, replace indoor controller board.
b) [RC NG] display
Replace remote controller.
c) [RC E3] display
[ERC00-66]
1 Check for disconnected or loose indoor
unit or outdoor unit indoor/outdoor con-
nection wire.
2-4
Turn power off and on and check.
If abnormality displayed again, replace
indoor controller board or outdoor con-
troller board.
123
Turn power off and on and check.
If abnormality displayed again, replace
indoor controller board or outdoor con-
troller board.
12
Turn power off and on and check.
If abnormality displayed again, replace
indoor controller board or outdoor con-
troller board.
Noise, etc. probable
cause.