What the manual says
Manufacturer manualBoiler thermostat calling for heat
From this model's manual
Verified against the Ideal/Ideal Classic Nf30 Nf40 Nf50 Nf60 Nf70 Nf80 installation & service manual.
DIY fix possible
Check that the room thermostat is turned up higher than the current room temperatureEnsure any external programmers or timers are set to 'On' or 'Auto'Wait a few minutes to see if the boiler begins its normal start-up sequence
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Related fault codes
All 6 fault codes on the Classic NF30–NF80
Seeing a different code? Every code this model can display, in one place.