Radiator not heating
If only the top is cold, bleeding may help; repeated pressure loss needs professional diagnosis.
What to do first
- Check whether the issue is isolated or affects the whole home.
- Take photos and note any recent changes, work or weather.
- Stop DIY if the task involves regulated work, hidden services, height or a safety risk.
What could be behind it
- Control/setting issue
- Air, pressure or circulation problem
- Component or appliance fault
These are common possibilities, not a diagnosis of your specific home.
When to stop doing it yourself
Stop if you are unsure of the cause, cannot isolate the system safely, need to open fixed electrical/gas equipment, work at height, disturb hidden building fabric, or the problem is getting worse.
QUOTE CHECK
Typical quote components
- Call-out
- Labour
- Valve/parts
PARTS / TOOLS
Possible items involved
- Radiator key
How to describe it to a professional
One radiator stays cold when the heating is on.
NEXT STEP
Move from symptom to action.
Compare the right service, understand the quote and keep the completed work in My Home.