Intergas
Poor Circulation / Sludged System
Radiators only get warm at the bottom or some radiators stay cold while boiler runs
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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
Sludge build-up in radiators, Blocked system filter, Partially blocked plate heat exchanger, Incorrectly balanced system
How to Fix / Troubleshooting
Safety: Radiators and pipes can be hot. Allow them to cool before handling.
- Bleed radiators: Use a radiator key to release trapped air from cold radiators, then re-pressurise the system.
- Check radiator valves: Ensure both flow and return valves are open on affected radiators.
- Clean system filter: If you have an external magnetic filter on the heating return, follow the manufacturer's instructions to clean it (isolate valves first).
- System balancing: Partially close lockshield valves on radiators that get hot quickly to force more flow to colder radiators.
- Engineer tasks: If problems persist, an engineer should powerflush the system, clean or replace the plate heat exchanger, and rebalance the system.
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Repair Difficulty
Medium
3/5
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