Vokera water heater shows code 08, no ignition, gas valve not operating correctly
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
Critical safety warning: Do not attempt to open, adjust, or test the gas valve yourself. All gas work must be carried out by a Gas Safe registered engineer.
User checks:
- Confirm that other gas appliances in the property are working normally. If none work, contact your gas supplier.
- Ensure the gas isolation valve beneath the heater is fully open.
- Attempt a single reset. If the code returns, stop using the heater.
Engineer tasks only:
- Measure inlet and burner gas pressures and compare with Vokera specifications.
- Test the gas valve coil resistance and operation; replace the gas valve assembly if defective.
- Check the PCB output to the gas valve for correct voltage and modulation signal.
- Verify correct combustion settings using a flue gas analyser after any gas valve replacement.
Due to explosion and carbon monoxide risks, this repair is strictly for qualified professionals.
Repair Difficulty
Required Part
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