BoilerFaultCodesYour boiler has lost power or is not receiving a signal to start heating, causing the mechanical status indicator to stop moving.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: - no tension - no heat demand
What causes this fault?
This issue occurs when the boiler is either lacking electrical power or is not receiving the signal from your thermostat to turn on. The most common reason is a blown fuse, a tripped circuit breaker, or a failure in the external controls like your timer or programmer. Effectively, the boiler is sitting idle because it doesn't know it needs to provide heat.
This fault is frequently seen at the start of autumn when homeowners turn their heating systems back on after a long summer break, often revealing that batteries in thermostats have died or external controls have seized.
DIY fix possible
Check if the boiler's main power switch is turned onEnsure your room thermostat or programmer is set to a temperature higher than the current room temperatureCheck your property's fuse box for any tripped circuit breakers
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 end of green zone; (no rotation of color disc) — no call-out fees, no surprises.
Affiliate links — we may earn a commission at no extra cost to you.
Could it be time for a new boiler?
If repair costs are adding up, a new energy-efficient boiler could be the smarter long-term choice.
Affiliate links — we may earn a commission at no extra cost to you.