Vokera high CO

[Millsy 82]

I've got a Vokera linea which has high CO worked it out to be a seal has gone in the flue. But when speaking to vokera they said (and quite abruptly) you have to put it on CO mode to stop it modulating. I already knew that but how can I leave a boiler which is pumping out high CO on hot water mode but when you put it on CO mode it runs alot lower. Surely the appliance is still dangerous as in normal operation it is pumping out high CO.

This is the second time Ive had vokera say this to me the last time I managed to get both normal operation and CO mode working safely and hoping this seal will dramatically reduce the amount of CO (700ppm and rising fast).

 

[nysk2008]

As per unsafe situations mate I would AR as flued appliance - failure to achieve a satisfactory combustion reading on a portable FGA, and ID coz of the flue seal, cap until you can sort the flue seal. Sod what vokera say its your ticket and lively hood - just out of curiousity what was the ratio? Maybe I am being over the top but anything regarding flueing im always v.cautious

 

[Millsy 82]

I don't know the CO started to rise pretty quickly so I took my analyser out left it for a minute or 2 just I case it was burning off a load of muck after a full strip down clean even though I had it running for 5 minutes before hand. Tested again and it started to rocket so instead of knackering my analyser I just put it down as high Fga readings. Capped and ordered this seal.

 

[nysk2008]

I don't know the CO started to rise pretty quickly so I took my analyser out left it for a minute or 2 just I case it was burning off a load of muck after a full strip down clean even though I had it running for 5 minutes before hand. Tested again and it started to rocket so instead of knackering my analyser I just put it down as high Fga readings. Capped and ordered this seal.

good man

 

[Reg Man]

As you have already identified, you need to get the flue correct first, before doing anything else. Re check the combustion after that. High CO does not necessarily mean poor combustion, but in this case 700ppm is not good. Its the ratio between CO and CO2 which counts. You could have 200ppm CO and 10% CO2 which would be a satisfactory ratio 0.002. Vokera don't sound to helpful in this matter, I was led to believe that the reading should be acceptable throughout the low and high range of modulation.

 

[arran197]

Is it the Linea SE or HE? The SE can cause high CO by having the burner pressure set wrong. Even a little bit too high and it'll throw it out. But seals are also common.

 

[Millsy 82]

Is it the Linea SE or HE? The SE can cause high CO by having the burner pressure set wrong. Even a little bit too high and it'll throw it out. But seals are also common.

Its the SE and the BP was the first thing I checked as I went to 1 last week running at 15 mb. I just think that Vokera shouldnt be saying its fine to leave it as long as the ratios are right in CO mode as the boiler will be running high in normal hot water mode.

What really makes me laugh about this though is that the boiler was "serviced" only 3 weeks ago by one of the other lads then the HA went in for a void inspection and condemned it quite rightly so. but its also a flue in a void running through a flat above (I got access as she is unable to leave the house) no inspection hatches no CO alarm fitted anywhere.

 

[armourer]

I might be teaching you lads to suck eggs and if I am I appologise but the test I always do in this situation is stick your analyser into the outer flue and check the O2 reading.
Anything less than 20% and you can bet the inner seals have gone and you get cross contamination.

Another quick check would be running it with the case seal off and see if your readings drop dramaticly.(not too long if your readings are that high).
If so it has to be vitiation as its now getting the oxygen from the room.