F03 Fault Code Boiler: Return Sensor

This forum contains videos for troubleshooting issues with the HTP Mod Con VWH hot water supply boilers.

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F03 Fault Code Boiler: Return Sensor

Postby HTP » Wed May 30, 2012 12:19 pm

This display indicates that the return temperature sensor of the boiler has failed. This code indicates a serious safety issue and the boiler will not restart until the sensor is replaced by a technician and he pushes the RESET button on the display. This situation is indicated by the red light on the display and the word LOCKOUT flashing on the display. During this lockout fault, the pump will be on as indicated on the second line of the display.

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