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Mend Honeywell 3 port valve Wrong Heating System

what can be wrong with my heating system ?

my heating keeps switching itself off, I have fitted a new Grundfoss pump and a new Honeywell 3 port valve but it is still the same, it works for a short period of time then switches off so I turn the electrics off and back on and it kicks in again for a short while, but sometimes it does stay on.

Malky d
April 2009
HoneywellHoneywell 3 port valveHeating, Home Heating SystemsWrong Heating System
also could be blocked heat exchanger does your system need a flush?

STE
April 2009
check temperature sensors and temperature stats

STE
April 2009

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Honeywell 3 Port Valve & Heating Issues