Heating Comes On When It Shouldn't
Radiators heating in the middle of the night or during a hot afternoon..
Radiators heating in the middle of the night or during a hot afternoon.
What is actually going on
Radiators heating in the middle of the night or during a hot afternoon.
The realistic causes, in order
A programmer schedule left on an old profile, or a clock that never adjusted for the season A zone valve stuck open, letting heat through whenever the boiler runs for hot water A hot water cylinder circuit that gravity-circulates into the heating because a valve is passing
What we test on site
Zone valve operation and manual lever position Programmer schedule and any holiday or override modes left active Whether the heating circuit warms during a hot-water-only demand
What you can safely look at with heating that comes on unrequested
- Check the programmer's schedule and any override buttons
- Feel whether it happens only when hot water is heating
- A zone valve manually latched open during a past repair is common and easy to miss — worth checking before assuming a control fault.
Who does the work
- Gas Safe registered engineers — registration 554328
- Worcester Bosch accredited installer
- John The Plumb Ltd, company registration 10026483
Get heating that comes on unrequested diagnosed properly
Valve replacement or schedule correction, often with a review of whether the zoning still matches how you use the house.
Questions we get asked
Is heating that comes on unrequested a controls fault or a boiler fault?
A programmer schedule left on an old profile, or a clock that never adjusted for the season
What normally puts heating that comes on unrequested right?
Valve replacement or schedule correction, often with a review of whether the zoning still matches how you use the house.
Is it safe to keep using the system with heating that comes on unrequested?
A zone valve manually latched open during a past repair is common and easy to miss — worth checking before assuming a control fault.