May be due toActionCauseAlarm text on the
display
Alarm no.
Connections, Cables and cards may
eventually need checking.
Accessory
blocked.
Temporary com-
munication fault
to accessory
card with shunt
controlled addi-
tional heat.
Com. error Acc. –EM1177
Check the Communication cables.Block accessory3 communica-
tion errors in
succession have
occurred on the
pool accessory
card
Com. error Acc. –Cl11178
Check settings of the dipswitch
Activates if the heating is blocked
and the outdoor temperature (BT1)
falls below 3 ºC.
Freeze prot180
Heating is permitted and con-
trolled by min. supply.
Periodic increase has failed to reach
stop temp. within 5 hours.
Unsuccessful periodic
increase
181
One or more power steps blocked
due to high current measured on
current sensor.
Load monitor activ-
ated
182
Defrosting in progress.Defrosting183
Temporary communication fault.
See alarm 96.
Comm. room unit,
zone 1
196
Temporary communication fault.
See alarm 97.
Comm. room unit,
zone 2
197
Temporary communication fault.
See alarm 98.
Comm. room unit,
zone 3
198
Temporary communication fault.
See alarm 99.
Comm. room unit,
zone 4
199
See relevant manualBlocks the com-
pressor
EB 101 sends an
error message
to the control
Cold outdoor air EB
101
271
See relevant manualBlocks the com-
pressor
EB 101 sends an
error message
to the control
Hot outdoor air EB 101272
See relevant manualHW-start and
HW-stop for
economy and
normal have
been set to de-
fault
Adjustment of
the hot water -
settings due to
short run times
HW-start and HW-stop
have reset to default
273
47Chapter 6 | TroubleshootingNIBE™ VVM 320
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