I have a Vaillant boiler, I think it's a combi boiler. We moved into the house in January and since then we have had heating and hot water on demand, no problems. Suddenly this week the hot water seems to have been running out and the heating hasn't been coming on.I have looked at the boiler and a F22 fault is coming up, which apparently means dry fire .. whatever that means. I have bled all the radiators and there is no air in the system, however the pressure (bar) reading is bottomed out entirely. Does anyone have any ideas before I call a plumber?
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Any Vaillant combi that use the F22 dry fire code has a built in filling loop.
This Site Might Help You. RE: Vaillant Boiler, Code F22, water pressure? I have a Vaillant boiler, I think it's a combi boiler. We moved into the house in January and since then we have had heating and hot water on demand, no problems. Suddenly this week the hot water seems to have been running out and the heating hasn't been coming on. I have looked at the...
you need to repressurise the system to one bar cold with the refill hose connection. There should be euther right under the boiler or in very close proximity 2 small valves attached to a braided hose. Both these valves need to be opened to allow water into the system(some have only one valve). Some vaillant boilers have this as a built in item but as you havnt said which model I cannot say if yours has.EDIT if your gauge is at zero then it needs to be refilled by which it may need 2 pints to bring the pressure back to the required working pressure not that the whole system needs to be filled.
