17
Vokera
Circulation Pump Fault / No Flow
Vokera water heater displays code 17, appliance indicates circulation or pump fault, may overheat quickly
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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
Seized pump, Airlocked pump, Blocked pump or system, Faulty pump wiring
How to Fix / Troubleshooting
Safety first: Isolate power and allow the system to cool before touching the pump or pipework.
User checks:
- Listen for the pump running noise when the heater calls for heat. A silent or very noisy pump suggests a fault.
- Check system pressure is adequate (around 1.0–1.5 bar cold).
Engineer actions:
- Remove the pump head and check if the impeller is seized; free it or replace the pump if necessary.
- Bleed air from the pump vent screw and high points in the system.
- Inspect for sludge or debris in the pump and nearby pipework; flush the system if required.
- Test the pump electrical supply and replace the pump if not operating correctly.
Pump replacement involves draining and refilling parts of the system and should be done by a heating engineer.
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Repair Difficulty
Hard
4/5
Required Part
Circulation Pump
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