My 2009 grant boiler heats the water fine but when the ch demands heat neither the ch pump or burner work. The demand light is on but the ch pump light is off. If you press the test switch the pump light comes on. I have checked the pump and non return valve and they are fine. If I remove the pump but keep it connected the pump light will switch on and the pump works. Could it be the flow switch?
-
Looking for a smarter way to manage your heating this winter? We’ve been testing the new Aqara Radiator Thermostat W600 to see how quiet, accurate and easy it is to use around the home. Click here read our review.
grant 36e external oil combi boiler
- Thread starter coolbawn1
- Start date
DIYnot Local
Staff member
If you need to find a tradesperson to get your job done, please try our local search below, or if you are doing it yourself you can find suppliers local to you.
Select the supplier or trade you require, enter your location to begin your search.
Are you a trade or supplier? You can create your listing free at DIYnot Local
