Vokera 29HE air pressure switch issues

[Nico]

Hi Guys was wondering if someone could help me out with a Vokera compact 29HE. Had been called out it last year and boiler was only firing up with cover off so replaced fan venturis. Called back today and venturis are clean. Heat exchanger is spotless with no debris between fins causing flow restriction and no obstruction in flue. Has anyone else had similar issues with these boilers and any advice on what else I should be looking out for? Could it be the DPS although it is making with the cover off?

Cheers

 

[Aquarius]

I’m not sure if this can be discussed in the public forum? Anyway is it a Horizontal or vertical flue? Have you sampled/checked the air intake? What’s the ratio like?

 

[Nico]

I’m not sure if this can be discussed in the public forum? Anyway is it a Horizontal or vertical flue? Have you sampled/checked the air intake? What’s the ratio like?
I thought I had put this in the gas engineers forum? I hadn't checked the ratio yet as it's being held off by the APS unless I take the cover off. I didnt have a new seal to check the inside of the condenser yet so I am going back tomorrow to inspect that aswell.

It's a horizontal flue just straight out the back. I didnt check the ratio

I’m not sure if this can be discussed in the public forum? Anyway is it a Horizontal or vertical flue? Have you sampled/checked the air intake? What’s the ratio like?

I hadn't done because it was being held off by APS unless I took the cover off so thought the issue was before the combustion side of things. I didnt have a seal for the condenser so I am going back tomorrow to inspect inside of that. It's a horizontal flue just straight out the back.