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Old 11-12-2017, 07:54 PM   #1
wanner69
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Worcester boiler problem

Is there anybody that can advise me on my boiler problem. Basically its losing pressure after the central heating has been on for a few hours on timer, the next morning when I check the gauge its at zero. Im having to top it up with water to get 1 bar of pressure back in. Everything is fine again until I check again the next morning and zero pressure again. When running, the boiler pressures up to around 2.5bar. Now I have no leaks anywhere. I've checked for water coming from the expansion tank via the valve and only air comes out which is correct. The pressure release valve was changed last year and all is fine with that. Can anyone offer any advise or solutions. Thanks
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Old 11-12-2017, 08:03 PM   #2
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Is it a condensing model ?
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Old 11-12-2017, 08:05 PM   #3
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Check the exhaust pipe from pressure relief valve to see if disappearing from there, relief valve might be lifting when it's up to temp.
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Old 11-12-2017, 08:12 PM   #4
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If you have let air out of the expansion vessel have you topped it back up ?


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Old 11-12-2017, 08:24 PM   #5
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Quote:
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If you have let air out of the expansion vessel have you topped it back up ?


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Yes back to 0.8 bar
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Old 11-12-2017, 08:26 PM   #6
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Quote:
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Check the exhaust pipe from pressure relief valve to see if disappearing from there, relief valve might be lifting when it's up to temp.
The prv will only lift when and if it over pressurises doesnt it? Is this the pipe from the prv that goes through the wall to the outside of the house? That does drip occasionally.
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Old 11-12-2017, 08:34 PM   #7
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Is it a condensing model ?
Combi boiler buddy
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Old 11-12-2017, 08:54 PM   #8
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My first thought was the relief valve, but your first post implied that you have checked that. The pressure in the expansion vessel should be checked when the system is empty.
If there is not enough pressure in the expansion side of the expansion vessel then it will over pressurise and possibly lift the prv. If there is dirt under the prv seat this can prevent it from shutting completely. With the system off do you get any water coming out of the condense drain ( why I asked if its condensing )
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Old 11-12-2017, 09:00 PM   #9
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Quote:
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My first thought was the relief valve, but your first post implied that you have checked that. The pressure in the expansion vessel should be checked when the system is empty.
If there is not enough pressure in the expansion side of the expansion vessel then it will over pressurise and possibly lift the prv. If there is dirt under the prv seat this can prevent it from shutting completely. With the system off do you get any water coming out of the condense drain ( why I asked if its condensing )
Thanks for the reply. I'm going to check the expansion tank tomorrow morning again. I occasionally get a drip from the pipe that goes through the wall to the outside. It's like a drain or overflow pipe, think it's from the prv possibly?
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Old 11-12-2017, 09:23 PM   #10
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There could be 2 pipes to outside, the prv and the condense, although it is acceptable to run the condense to an internal drain. I prefer internal as there is no risk of it freezing but sometimes its not practical.
The prv should be in copper and the condense in 21.5mm plastic internally changing to 40mm plastic just before it goes outside if it does. Some installers route the prv to the condense drain which is a bit naughty.
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