Main multi ff

[Motucks]

Hi all, i have a main multi ff water heater. When running all is well for about 5 mins, then no hot water and red light flashes. I think it is a combustion air problem. I have check the flue and it is clear, the 86mm restrict or plate is fitted as required and there is plenty off room around the heater. If I take the case off it will run all day. Once case is back on same fault occurs. Does anybody have any ideas.
By the way I am gas safe registered, but I am a gas installer no a service engineer.
Thanks Motucks.

 

[Dotty]

Please read the forum rules regarding the repair of gas appliances.

If you are a gsr please build your post count up to 10 + then send an image of the front and back of your gsr card to [email protected].

We will admit you to the private forum where we will be more than happy to help.