Recent content by LSP2020

Thanks for the heating Have you at any time unplugged the DHW flow sensor? No Or tested it with a multimeter? No Do you think it's the flow sensor that's failing?

Hey Tony - tried what you suggested and the heating fires up. When I turn the temp on the HW back up the heating cuts out??

The boiler is about 4 years old............ It fires to heat water but it doesn't click into CH mode so the rads dot heat?

Yeah? Flow Switch - Cold Water Inlet Elbow with Water Flow Switch??

Help/advice greatly appreciated. The boiler is heating water on demand but not heating rads. I’ve tried resetting every thing even the external Siemens thermostat but this doesn’t help. I’ve been in touch with Viessmann and they say it’s either the thermostat unit or the Flow Switch. I’m happy...