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Boiler is firing every 5 minutes or so

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tonytimms

I have a Worcester combi oil fired boiler about 10 years old that has been working ok but recently I have noticed that it fires very frequently, as often as once every 5 minutes, all day. It did not do this before. The thermostat on both the hot water and the central heating seem to work ok but even when I turn it down it still seems to fire just as frequently. My local engineer says it is the cold weather but I can't believe that as it's quite mild at the moment. Hope someone has an idea what causes this.

Regards
 
Is it fitted with a frost stat? if so it could be set wrong or faulty
 
You dont have a hot tap dripping/ running in the property. I Know it sounds obvious but is a possabillity
 
I have checked the hot water tap, it only has one on the kitchen sink and one in the bathroom, the shower is electric. I have also looked under the sink etc and can't see any leaks. The boiler is losing a bit of pressure but not much, probably about 0.5 bar every week.
Regards
 
I can't think of anything else at the moment, somebody else will though
 
Turn off the cold supply into the boiler there is an on/off valve on the cold in at the top of the boiler. This will just prove if there is a possibility of a leak somewhere that you cant see, if it stops you have a leak somewhere if not will go to the next stage.
 
probably about 0.5 bar every week....

We , I mean you ,have a problem Houston.
 
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Thank you for the obvious bad news but what I am looking for is a solution.

Regards
 
hi, can you fiind/see any leaks on ch system/boiler ? is any water dripping from pressure relief pipe ? what pressure is on gauge when system hot ?
which model is boiler ?
 
Worcester man...doth though take the mickey???
 
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