Alarm list
A-alarm
In event of an A alarm the red lamp on the front lights and an alarm icon is displayed. First go through the suggested
actions shown in the display.
May be due toHeat pump action.CauseAlarm text on
the display
Alarm
no.
See fault-tracing schedule page
23.
Calculated flow temperature is
set to min supply line (menu
1.9.3).
Sensor not connected/defect-
ive
(outdoor sensor)
Sensor fault BT11
See fault-tracing schedule page
24.
Uses BT3 if available.
If BT3 is not available, BT63 is
used.
Sensor not connected/defect-
ive
(heating medium supply)
Sensor fault BT22
See fault-tracing schedule page
24.
No actionSensor not connected/defect-
ive
Sensor fault BT33
(heating medium return)
See fault-tracing schedule page
24.
Uses BT54Sensor not connected/defect-
ive
Sensor fault BT66
(hot water, controlling)
See fault-tracing schedule page
23.
Automatic reset.Sensor not connected/defect-
ive
Sensor fault
BT25
25
(heating medium flow, extern-
al)
See fault-tracing schedule page
24.
Blocks internal electrical addi-
tion.
Sensor not connected/defect-
ive
Sensor fault
BT63
31
See fault-tracing schedule page
25.
Switches off solar function.Sensor not connected/defect-
ive
Sensor fault
EP30 - BT53
33
(solar panel)
See fault-tracing schedule page
25.
Switches off solar function.Sensor not connected/defect-
ive
Sensor fault
EP30 - BT54
34
(solar coil)
See fault-tracing schedule page
25.
Shunt closes. Burner stops.Sensor not connected/defect-
ive
Sensor fault
EM1 - BT52
35
(boiler)
See fault-tracing schedule page
25.
Controls the return sensor
(EP21-BT3)
Sensor not connected/defect-
ive
Sensor fault
EP21 - BT2
36
(supply temperature sensor,
extra climate system 1)
See fault-tracing schedule page
25.
Controls the return sensor
(EP22-BT3)
Sensor not connected/defect-
ive
Sensor fault
EP22 - BT2
37
(supply temperature sensor,
extra climate system 2)
15Chapter 6 | TroubleshootingNIBE™ VVM 500
6 Troubleshooting
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