Turbomax 828e Cycling hotwater and heating

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1 Apr 2020
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Hi All

Got a problem with a turbomax boiler. Water cycles hot and cold and heating is cycling also.
HW - goes cold for a couple of seconds.
CH - From cold start will fire-up reach temperature on boiler and stay off for next 4min and then start gain. The temperature on the digital gauge drops quickly.

Done so far:
NCT changed
Small heat exchange changed
Power flush complete.

Could it be i have two problems? Thanks for your help.
 
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