Ultracom 30 cxi gas valve set up

[ss123]

I have been to change a ultracom 30cxi gas valve today and have had trouble setting it up,i fired it up after fitting and co was off the scale, phoned glow-worm and was told to wind the throttle in all the way and the back out 11 times and then adjust maybe up to 15 times, to get the co2 up, I went to 11 times co still off the scale, I checked the old valve and the throttle was wound out 8 times co copied this and with an inlet pressure of 18mb the co was 139ppm co2 8.5 ratio 0.0016 on Hi, just about in spec but would of expected better having just cleaned the hex and fitted a new door seal, the trouble is on low or when modulating down on ch the co2 was only 7.5 and it starts a blowing and farting noise, i tried to adjust the offset(which they state is course so only small adjustments are required) no matter how much i turn it makes no difference to the reading, this is the same with the cover on or off , is the new gas valve faulty or has any one experienced this, any suggestions would be appreciated.:mad2:

Thanks in advance

 

[Gasmk1]

do you not have to set the low rate as well

 

[ss123]

Please move my post to private gas safe registered forum, thanks

 

[ss123]

That was the problem on low it would not adjust using the offset as per the Mi.

 

[Aquazone]

Is this the one with a circular Gianonni heat exchanger or the ally block with the burner on the top?

 

[Elgordo]

Check that the combustion door/cover isn't warped ordeal damaged
-run Fga probe around rim when its running- worth a try

 

[Elgordo]

Check that the combustion door/cover isn't warped ordeal damaged
-run Fga probe around rim when its running- worth a try

 

[Gasmk1]

Check that the combustion door/cover isn't warped ordeal damaged
-run Fga probe around rim when its running- worth a try

yes check seals are all ok does this have the small silcon one also

 

[Gasmk1]

sorry still doubling

 

[Fowlersrs]

Ultracom 2 boilers don't have an adjustable low range. It's weird I know but basically if it's hunting when it modulates back you need to look at increasing the gas on max.