Boiler problem - constant switching on/off

Joined
17 Mar 2004
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United Kingdom
Hi,

Hope someone can be of help with this problem as it's driving me mad.
Have an Appollo boiler that once has been on for a short time, swithces off and back on continuously every 30-secs to 1 min or so.

Have had a plumber in who has changed the solenoid, the circuit board, reduced the gas pressure and lowered the pump speed, but still it does the same thing. There are NO loud banging noises, although does sound as if there is some air in the system.
Now tells me that he can't find a problem with it and that this is a feature of this type of boiler - something to do with the fact that this boiler has a low water content - but I just don't buy it.
Surely this can't be true is it? No boiler I have ever known has done this.
Be grateful to anyone who can help.

Also tried to find the manufacturers no. to give them a call but unable to locate it so grateful to anyone who can help there also.
 
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