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TMC TMC is offline
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Default Why's my boiler gone over-pressure?


"A.Lee" wrote in message
...
Alpha Combi boiler. Working fine, or so I thought.
A bit chilly this evening, so put the heating on for the first time in 3
weeks or so.
Pressure was a little low, so fill up to the recommended 1 bar. Tap is
shut off.
Heating comes on fine. 20 minutes later, I'm outside and hear water
running - the pressure relief/overflow from the boiler is spewing out a
bit more than a trickle, but less than a hosepipe, of hot water.
Back inside, turn off heating. Notice pressure guage now at 4 bar, hence
the pressure relief.
First thought, air in system, though bleeding all the rads doesnt
produce much air - typical of what I'd expect after not being done for 6
months.
Pressure now down to 2 bar when it is cool.



So, why has this happened?
The pressure relief has never opened, to my knowledge, in the 8 years
we've had the boiler.
All rads were warm, though not hot.
Thanks
Alan.
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Did you remove the filler pipe after topping up the pressure?

If not tap may not have been properly closed

Tony