BoilerFaultCodesYour boiler is working correctly, but it is currently waiting for a signal from your room thermostat or programmer to tell it to turn on the heating.
This is a minor fault. Keep an eye on it and mention it at your next annual boiler service. Reset the boiler and see if it clears.
Technical description: No Heating demand from external controls 230V
What causes this fault?
This status occurs because the boiler is powered on and ready to work, but it hasn't received a 'request' for heat from your wall thermostat or timer. It is physically blocked from firing up because your external controls are telling it that the house is already at the desired temperature or that the heating is scheduled to be off.
This code is frequently seen during the transition into autumn when homeowners first try to turn their heating on, only to find the thermostat batteries have died over the summer.
DIY fix possible
Check that your room thermostat is turned up higher than the current room temperature.Ensure your heating programmer or central heating clock is set to an 'On' period.Check if any wireless thermostats have run out of batteries and replace them if necessary.
Find a Gas Safe engineer
Search the official register for a qualified engineer in your area.
Gas Safe Register →Protect yourself from future repair bills
A boiler cover plan would cover faults like S.30 — no call-out fees, no surprises.
Affiliate links — we may earn a commission at no extra cost to you.
Glow-worm Ultrapower sxi is discontinued — time for a new one?
Parts for discontinued models can be hard to find and expensive. A new A-rated boiler could save you money on both repairs and energy bills.
Affiliate links — we may earn a commission at no extra cost to you.