Gas hob on or off doesn't seem to make aa differene and boiler works if I put into SF mode and then continues to work for quite a time when it...
Gas is fine, I have a hob and fire.
Flue is horizontal
I ihave a Vailant Turbomax with a F28 error code.
If I push the 2 buttons to put it into FSH mode it works and sometimes if I just push...
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