May be due toHeat pump action.CauseAlarm text on
the display
Alarm
no.
See relevant manual.Compressor blocked.Sensor fault MHI exchange,
(E37)
This alarm is
generated by
the heat pump
277
See relevant manual.Compressor blocked.Sensor fault MHI ambient air,
(E38)
This alarm is
generated by
the heat pump
278
See relevant manual.Compressor blocked.Sensor fault MHI discharge,
(E39)
This alarm is
generated by
the heat pump
279
See relevant manual.Compressor blocked.Sensor fault MHI suction,
(E53)
This alarm is
generated by
the heat pump
280
See relevant manual.Compressor blocked.Sensor fault MHI LP, (E54)This alarm is
generated by
the heat pump
281
Check communication cablesAccessory is blocked.Temporary Comm. Fault Act-
ive 4-pipe cooling ULVP
Com. error Acc.
–EQ1
283
Check settings of the dipswitch
See cause.Hot water is blocked.If the outdoor unit connected
to VVM320 is something oth-
er than F2030-7, F2030-9,
F2040-8, F2040-12.
Non-compatible
air-water heat
pump.
296
Check communication cables.Master blocks relevant com-
pressor. The compressors are
stopped on the slave.
Communication with the slave
missing for 15 secs.
Perm. comm. to
a slave unit -
EB102
301
See relevant manual.Compressor blocked.Sensor fault detected on the
slave Off Com-interface MHI-
EMMY
Sensor fault on
EB101
403
See relevant manual.Compressor blocked.Sensor fault detected on the
slave Off Com-interface MHI-
EMMY
Sensor fault on
EB101
404
See relevant manual.Compressor blocked.Sensor fault detected on the
slave Off Com-interface MHI-
EMMY
Sensor fault on
EB101-BT12
412
See relevant manual.Compressor blocked.Sensor fault detected on the
slave Off Com-interface MHI-
EMMY
Sensor fault on
EB101-BT15
415
45Chapter 6 | TroubleshootingNIBE™ VVM 320
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