I have drained the system of a combination boiler to change a valve. The heating fired afterwards but kicked out it has done this a few times. The auto air vent on the pump is open. Any ideas guess it's an airlock. Best way to clear. Not had it before on a sealed system.
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Heating not staying on after system drain
- Thread starter Fallout
- Start date
H
Hot&Cold
Which valve has been exchanged
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