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I have a Keston C25 supplying a cylinder & underfloor heating. Both cylinder and UFH are wired together to SL on the boiler. My cylinder thermo will call boiler and it comes and stays on until temp reached when thermo cuts live via Drayton ZA5 However my UFH will supply live to the SL...

I thought my Heating was causing my boiler to fly for short spurts of 5 secs but today after disconnecting the live feed from my Underfloor heating to the boiler, I discovered that the boiler was still firing in short spurts with only the HW wiring connected. But the HW control was set to...