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What ever temperature I set the boiler to it reaches it then drops to 40 something before kicking in again and reaching the set temperature. Been trying it all day with different temps, room stat high/low, rads high/low, hot water on/off. But it always does the same thing, the house wont get...

It's monza 24 from B&Q

Hi and merry Christmas, I have had new full system fitted, the rads all heat up to the set temp (60) but then the boiler stops firing untill the temp drops to about 40 before it kicks in again. I have changed the room thermostat incase it was that but it's made no difference. I bought the...