Technical description
LED 1: Off, LED 2: On, LED 3: Flash, LED 4: On (Go to CH Fault section of the fault finding instructions)
DIY fix possible
Check that your room thermostat or heating programmer is turned up and calling for heatEnsure all radiator valves (TRVs) are open and not stuck in the closed positionReset the boiler by turning the selector switch to the 'R' position for at least 5 seconds
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