Vokera water heater shows code 06, burner shuts down on high temperature, frequent cycling, possible kettling noises
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.
Possible Causes
How to Fix / Troubleshooting
Safety first: Turn off power and allow the appliance to cool. Do not remove any sealed combustion covers.
User checks:
- Check system pressure: For sealed systems, ensure pressure is around 1.0–1.5 bar when cold. Top up via the filling loop if low, following the manual.
- Bleed radiators (if connected to a heating circuit) to remove trapped air that can restrict flow.
Engineer actions:
- Inspect and clean the primary heat exchanger for limescale and sludge; perform chemical descaling if necessary.
- Check operation of the circulation pump (speed, noise, current draw) and replace if weak or seized.
- Clean or replace any system filters or strainers on the return line.
- Verify correct bypass valve operation if fitted.
Persistent high temperature faults can damage the heat exchanger; have the system serviced by a qualified engineer.
Repair Difficulty
Required Part
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