De Dietrich
System Imbalance / Air Lock
The furnace runs but some radiators remain completely cold.
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Possible Causes
Air trapped in specific radiators, Closed lockshield valves, Incorrect balancing of De Dietrich heating circuit, Blocked branch pipe.
How to Fix / Troubleshooting
Safety: Radiators may be hot; use a cloth when bleeding.
Steps:
- Bleed cold radiators: Use a radiator key to release air until water flows.
- Check valves: Ensure both TRV and lockshield valves are open on cold radiators.
- Balance system: Slightly close valves on radiators that heat quickly to force more flow to cold ones.
Professional help: If a radiator remains cold, a technician should check for blockages or pipework issues.
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Repair Difficulty
Easy
2/5
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