NIBE alarm code 3
Alarm code 3 on a NIBE heat pump (including F series) means: Sensor error BT3 (heat pump return): Sensor not connected or defective (condenser IN). Reset the appliance once. If the code comes back, a part is usually faulty, often the siphon. You can check the water pressure and settings yourself; leave work on gas-carrying parts to a certified gas engineer.
After a safety alert (gas, flue gas, combustion), reset no more than once and call in a certified gas engineer. If you smell gas, call your national gas emergency number or 112 immediately.
Cause
Fault code 3 on a NIBE heat pump indicates: Sensor error BT3 (heat pump return): Sensor not connected or defective (condenser IN).
Applies to
NIBE F series, -.
Matching parts
NIBE parts are available from Instalpunt; shipping to EU countries from €17.95 (€24.95 for more distant countries), usually 3–5 working days.
For fault code 3, the part involved is usually in the category: condensor.
To fix this fault you often need a replacement part. View the available NIBE parts:
Further reading on this cause
Other NIBE codes with the same cause
- 107 — Sensor error BT11: Sensor not connected or defective (condenser out)
- 65 — High condensate level: Alarm from external level sensor
Fix it yourself or call an engineer?
Always consult the manual for your appliance and work safely. If in doubt or if the fault comes back, call in a qualified professional. A question about a part? Write to us at info@instalpunt.nl.
Frequently asked questions
What does NIBE heat pump alarm code 3 mean?
Sensor error BT3 (heat pump return): Sensor not connected or defective (condenser IN).
How do I fix alarm code 3 on a NIBE heat pump?
First check the cause described above. Then restart the appliance using the reset button. If the message comes back, a part usually needs replacing or the fault needs to be repaired by a qualified professional.
Which parts do I need for NIBE alarm code 3?
That depends on the exact cause. In the NIBE parts overview at Instalpunt you will find the current price and stock for each part.
Can I fix fault code 3 myself?
You can reset the appliance and check things like the water pressure or settings yourself. Work on gas-carrying parts must be left to a certified gas engineer.
All NIBE heat pump faults and codes at a glance →