Intergas
No Central Heating Output
Boiler runs but radiators do not heat up, hot water may still work on combi models
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Faulty room thermostat or wiring, Stuck diverter valve (on combi), Motorised zone valve failure, Pump not circulating to heating circuit
How to Fix / Troubleshooting
Safety: Electrical checks on controls should be done by a competent person. Do not open wiring centres if unsure.
- Check programmer and thermostat: Ensure heating is set to 'ON' and the room thermostat is turned up.
- Feel pipes: Carefully feel the flow and return pipes near the boiler. If they are hot but radiators are cold, a zone valve or diverter may be stuck.
- Check motorised valves: If accessible, feel the pipes either side of any external motorised valves. A cold pipe after the valve when heating is on suggests a stuck valve.
- Engineer tasks: The engineer will test the room thermostat circuit, check the diverter valve on Intergas combis, test external zone valves, and verify pump operation.
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Repair Difficulty
Medium
3/5
Required Part
Diverter Valve Assembly
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