I have a Vaillant Ecomax boiler and it's showing F25 - which I think is the low pressure error message.
However, I don't know how to top it up - I know there is a valve under the boiler, but when I had a look, I didn't know what to do. Can anyone help?
Thanks
OW
However, I don't know how to top it up - I know there is a valve under the boiler, but when I had a look, I didn't know what to do. Can anyone help?
Thanks
OW