Demand High
Your boiler is not currently receiving a signal from your timer or thermostat telling it to switch on.
Technical description: If not lit this indicates either timer or programmer is not calling for hot water / switch is not set to constant
Typical repair cost: £0-120 (including labour)
DIY fix possible
Check that your room thermostat is turned up higher than the current room temperature.Ensure your programmer or timer is set to 'ON' or 'AUTO'.Check if the batteries in your wireless thermostat need replacing.
Protect yourself from future repair bills
A boiler cover plan would cover faults like Demand — no call-out fees, no surprises.
*Affiliate links — we may earn a commission at no extra cost to you. Prices shown are starting prices.
Parts commonly replaced
- Room thermostat
- External programmer
- Receiver box
*Affiliate links — we may earn a commission at no extra cost to you.