Temperature sensor fault Engineer visit required
Outside sensor Engineer visit required
PCB lock out May follow power supply problem; try reset
Gas supply fault Check gas is turned on, if prepayment meter check there is credit. If all ok and E133 persists – contact Engineer to visit & investigate
Overheat lock out This may follow a power cut, try reset
Overheat Ensure radiators are bled of air
Low water pressure Add water to the system via filling loop
Overheat Ensure radiators are bled of air
Poor combustion Check flue terminal is not obstructed
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