Mitsubishi Heavy Industries FDCW100VNX-A, Technical Manual

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Service
‘19 • HM-T-340
Alarm list
Indoor unit alarm
Alarm
No. Alarm text on the
display
Description May be due to
220 High pressure alarm The high pressure switch (63H1) deployed
5 times within 60 minutes.
2HP model: BP4 has been above 4,15MPa 5
times within 60 minutes.
- Insuffi cient air circulation or blocked
heat exchanger
- Open circuit or short circuit on input
for high pressure switch (63H1)
- Defective high pressure switch
- Expansion valve not correctly connected
- Service valve closed
- Defective control board in FDCW
- Low or no fl ow during heating operation
- Defective circulation pump
- Defective fuse, F(4A)
228 Failed defrosting 10 aborted defrost due to alarm: 418,419 or 343 - Too low water fl ow
- Too low return temperatur
294 Incompatible heat pump Heat pump and indoor module do not
work properly together due to technical
parameters.
- Outdoor module and indoor module
are not compatible.
403 Sensor fault from PCA
154
Sensor fault, Sensor incoming water in
HSB and HMA-S (BT3).
- Open circuit or short circuit on sensor input
- Sensor does not work
(see section"Disturbances in comfort")
- Defective control board AA23 in indoor unit.
404 Sensor fault from PCA
154
Sensor fault, Sensor high pressure heating/
low pressure cooling in HSB and HMA-S (BP4).
- Open circuit or short circuit on sensor input
- Sensor does not work
(see section "Disturbances in comfort")
Defective control board AA23 in indoor unit.
412 Sensor fault from PCA
154
Sensor fault, Sensor outgoing water in HSB and
HMA-S (BT12).
- Open circuit or short circuit on sensor input
- Sensor does not work
(see section "Disturbances in comfort")
- Defective control board AA23 in indoor unit.
415 Sensor fault from PCA
154
Sensor fault, Sensor fluid pipe in HSB and
HMA-S (BT15).
- Open circuit or short circuit on sensor input
- Sensor does not work
(see section "Disturbances in comfort")
- Defective control board AA23 in indoor unit.