ATAG
Air in System / Poor Circulation
Furnace starts then shuts down after a few seconds, radiators only warm at the top
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Possible Causes
Trapped air in radiators and high points, Air in pump, Recently drained and refilled system without proper venting
How to Fix / Troubleshooting
Safety first: Allow the system to cool before bleeding.
- Bleed all radiators and any manual air vents on high pipework.
- Vent the circulation pump via its bleed screw if accessible.
- Top up system pressure after bleeding to the correct level.
- Run the system and repeat bleeding if necessary until circulation is stable.
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Repair Difficulty
Easy
2/5
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