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1
Check the display or control panel
Look at the heater screen or controller. If there is no display, error code, or the panel is unresponsive, the heater may have shut down due to a safety fault.
No display Error code shown Panel unresponsive -
2
Confirm gas and power supply
Ensure the gas isolation valve is fully open and electrical power is supplied. Gas heaters require both gas and electricity to operate.
Gas valve ON Power supply present No tripped switch -
3
Test hot water flow
Turn on the hot water tap fully. If water flows but stays cold, the heater is not igniting or is shutting down during operation.
Water flows No heating Cuts off mid-use -
4
Listen for ignition and fan blower
When the tap is turned on, the fan should start and ignition should occur. Silence, weak airflow, or abnormal noise indicates an internal fault.
No ignition sound Fan not running Unusual noise -
5
Stop using if heater remains non-operational
If the heater still does not work after checks, avoid repeated resets. Continued operation may be unsafe. Arrange a licensed gas inspection.
Heater not working Do not force restart Book inspection
