Nibe VVM 500 Service Manual

Alarm 33-38 – sensor fault
Fault-tracing in accessory card.
Is the actual sensor correctly
connected?
YES
YES
YES
Are the sensor features OK,
measured from the connected
sensor cable in the accessory card
(AA5)? (See "Temperature
sensor" section.)
Are the characteristics for the
sensor OK, measured over the
sensor on the accessory card
(AA5)? (See "Data for
Temperature sensor" section.)
Check wiring and switches.
NO
NO
Defective sensor. Replace.
Action.
NO
Is the output voltage from the card
correct? (See "Data for
temperature sensor" section.)
Defective accessory card (AA5).
Replace.
YES
Check wiring and switches.
NO
25Chapter 6 | TroubleshootingNIBE™ VVM 500

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.