Boiler Turns on and off

Joined
28 Sep 2005
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Location
Warwickshire
Country
United Kingdom
any Ideas ? my "apollo" boiler starts fine and provides hot water but it keeps firing up and shuting down once every 30 seconds ? because of this my central heating never really gets up to temperature and is luck warm any help would be great. is this some sort of blockage ?
 
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1) this happens in the morning after about 20 minutes of turning it's self on
2) it is a Gas boiler not Combi just standard condensing
3) has the problem for 18 months (on and off) seems worce when weather gets colder
4) The heating pump seems to work fine as the water circulates effectivly and we get ample hot water.
 
The heating pump seems to work fine as the water circulates effectivly
Are you sure about this? If the water was circulating effectively, the radiators would get hot! Are the pipes connecting to the rads getting hot? If not, you do not have effective circulation.... :confused:
 
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Have you got a by-pass circuit, the by-pass maybe opened to much?
 

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