Nibe
No Heat Transfer from External Heat Source
Water heater connected to a Nibe heat pump does not receive heat; coil connections remain cold while heat pump runs.
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Closed valves on coil circuit, air lock in coil, circulation pump on heat pump side not running, blocked strainer on primary circuit
How to Fix / Troubleshooting
Safety first: Turn off power to pumps before opening strainers or vents. Hot water may escape.
- Step 1 – Check valves:
- Ensure all isolation valves on the coil flow and return are fully open.
- Step 2 – Feel pipes:
- Carefully feel the flow and return pipes; if both are cold while the heat pump is running, circulation is likely blocked.
- Step 3 – Bleed air:
- Bleed air from high points and the coil circuit.
- Step 4 – Clean strainers:
- Locate and clean any strainers on the primary circuit feeding the Nibe cylinder.
If the coil remains cold, the primary pump or heat pump controls should be checked by a qualified technician.
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Repair Difficulty
Medium
3/5
Required Part
Primary Circuit Strainer
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