If the boiler fires but rooms stay cold, the cause may be trapped air, closed valves, poor balancing, circulation problems or sludge within the system.
Understanding the issue
If the boiler fires but rooms stay cold, the cause may be trapped air, closed valves, poor balancing, circulation problems or sludge within the system.
What to check
Feel radiators carefully. Cold at the top often suggests air; cold areas at the bottom can be associated with restricted circulation or deposits. Check thermostatic valves are not turned off.
When to get advice
Bleeding and balancing can help straightforward cases, but recurring problems, leaks or pump/control faults should be investigated rather than masked.
This is general information, not a substitute for inspecting your property. Do not work on gas equipment or live electrical parts unless appropriately qualified. If there is immediate danger, call 999. If you smell gas or suspect a gas escape, leave the affected area and call the National Gas Emergency Service on 0800 111 999 from a safe location. Do not operate electrical switches or use naked flames.
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