M
mchandler
Hi there, we've had a 20/25 second hand boiler installed, replacing a very old 20/25. The heating cuts out and diverter goes to hot water and stays there, pump stops. I've noticed this can happen after the washing machine fills - the cold inlet tees off very near the boiler mains inlet. I could hear the flow switch flapping as the washing machine fills in pulses. I can get the heating back by simply turning a hot tap on for a few seconds - diverter goes to heating, pump back on and away we go. The heating stops a few times during the course of the day. I've ruled out the room stat (shorted to constant demand). I called Worcester suspecting a flow switch problem. They agreed it needed ruling out so it's just been replaced. But still the heating cuts out. One thing they suggested was the system might need an extra expansion vessels to absorb some pressure in the cold mains incase it's affecting the flow switch. We do have good water pressure here - not sure exactly but it is strong. Any suggestions very welcome... thanks a lot