10-07-12, 09:00 AM
I'm not a heating engineer, but wouldn't expect the level check valve to cut off flow to the pump. It's purpose is simply to isolate the transparent column when not in use.
This sounds more like an airlock at the pump or a faulty pump.
Is the level of oil above that of the pump? If not it may need some sort of priming procedure.
This sounds more like an airlock at the pump or a faulty pump.
Is the level of oil above that of the pump? If not it may need some sort of priming procedure.