Glow Worm Flexi Boiler SX 18

[jojobetty]

Hello, my question is relating to our boiler that is showing F22 fault when central heating is turned on, the boiler is ok when hot water is on but does make a very loud banging noise at times. It shows the bar at 3 or below when not working and I have taps in airing cupboard where I top it up from but this is happening now every time I put the heating on. Works perfectly once this is done until the next day when turned on again and have to repeat the process.

Hope I have explained this ok but always had a normal everyday boiler so really don't know much about these sealed units which was inherited from previous owner. (they seemed to have the problem being a reset key already in cupboard. Charming people left us massive electrical problems too that have now been dealt with) Checked the radiators etc., for leaks but all dry and no wet patches anywhere visible. Appreciate any help before I have to call in plumbers and more expense!! Thank you.

 

[ollski]

Think there is a pinned post about recharging the expansion vessel up the top of the forum somewhere

 

[45yearsagasman]

F22 is a low pressure fault. Are you saying you have to top it up everyday? It should only be topped to 1bar cold. You may have an expansion vessel fault. Can only guess with scant info.

 

[steve32]

You need to reduce the pressure to 1 - 1.5 bar cold and check the expansion unit see faq.

 

[jojobetty]

Thanks for the replies, much appreciated. Only have to do it when the heating turned on, the hot water is fine and runs perfectly without having to do anything. Will follow advice on expansion tank. We have one in the loft, is this the one? or do you have one in the boiler too? Will look this up on faq, being I have no idea about this at all.

 

[45yearsagasman]

Pics of your airing cupboard and the cylinder etc would help.