Nibe VVM 500 Service Manual

May be due toHeat pump action.CauseAlarm text on
the display
Alarm
no.
See fault-tracing schedule page
25.
Controls the return sensor
(EP23-BT3)
Sensor not connected/defect-
ive
Sensor fault
EP23- BT2
38
(supply temperature sensor,
extra climate system 3)
See fault-tracing schedule page
25.
Shuts off cooling, Closes shunt
(QN18) for cooling.
Sensor BT64 not connected,
defective.
Sensor fault
EQ1–BT64
39
Motor protection on one
phase (Norway) machine has
probably blown.
45
Internal electrical addition is
blocked.
Temperature limiter has
tripped
The temperat-
ure limiter has
tripped
52
Check serial numberThe compressor stops, all relay
outputs are set to 0 V
Serial number and program
do not match
Incorrect pro-
gram
56
Compressor blocked.Serial number and program
do not match each other.
Incorrect pro-
gram
57
All relay outputs are set to 0 V.
See fault-tracing schedule on
page 26.
Blocking the relevant com-
pressor. Calculated flow temper-
ature is set to min supply line.
Communication with the in-
put card missing for 60 secs.
Communication
fault with PCA
input EB15
70
See fault-tracing schedule on
page 27.
Compressor (EB101) blocked.Communication with the base
card missing for 15 secs.
Communication
fault with PCA
base-AA2
71
- Check communication cablesAccessory is blocked.Communication with the ac-
cessory card missing for 15
secs.
Existing commu-
nication fault
with ”access-
ory".
73 -
95
- Check the setting of the
dipswitch.
- Check communication cablesAccessory is blocked.Communication with room
unit zone 1-4 missing for 60
secs.
Existing commu-
nication fault
with ”room
unit".
96 -
99
Check fuses, voltages to the
accessory card .
Accessory blocked.Temporary communication
fault HW comfort.
Com. error Acc -
QZ1
206
Check that the communication
cables are correctly connected.
Check the setting of the
dipswitch.
- Check the communication
cables.
Switches off step controlled
additional heat.
Communication with the ac-
cessory card missing for 15
secs.
Communication
fault ACC EB1.
208
- Check settings on the
dipswitch.
See relevant manual.Compressor blocked.See relevant manual.High pressure
alarm.
220
NIBE™ VVM 500Chapter 6 | Troubleshooting16

Nibe VVM 500 Specifications

General

Type	Indoor module
Volume	500 liters
Integrated immersion heater	Yes
Energy efficiency class, DHW preparation	A
Compatible with	NIBE air/water heat pumps
Refrigerant	Not applicable
Cooling Capacity	Matches the heat pump it is connected to.