Water heater ignites but shuts down after a few seconds, hot water stops quickly
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: If the burner repeatedly lights and goes out, do not keep resetting the appliance. Risk of incomplete combustion.
User checks:
- Confirm other gas appliances work normally; if not, contact your gas supplier.
- Ensure the flue terminal is not blocked.
Engineer actions:
- Check gas inlet and burner pressure and adjust or report supply issues.
- Clean the main burner and check for corrosion or blockage.
- Inspect and clean/replace the flame sensing electrode.
- Verify correct operation of the fan and air pressure switch.
Because combustion quality is involved, this fault must be handled by a qualified gas engineer.
Repair Difficulty
Required Part
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