Plumbing Questions? Ask a Plumbing Expert.
hi i am dan i can help you with this but first i need a little more information, was this happening before you changed the sensor? also what was the purpose for replacing the sensor? and does the hot water have its own tank with its own circulator?
Ok and is it reading the pressure. If so what is the pressure in the boiler
Are you confident that all the piping is purged and bleed of air and make sure all the valves in the piping are open
Do you get any fault codes on the boiler? If the boiler starts up then youf thermostat is working and the problem is probably elsewhere. Just to be sure you can jumper the 2 wires from the thermostat together to eliminate that as a problem. Also do the pipes out of the boiler and after the system circulator get warm?
Are you still having problems - if I can help?