Flow Temp Rising Too Quickly - Fix?

[Johntheo5]

Thanks pal!

So installing a new one outside boiler will do the job of the possibly seized one inside the boiler?

Do you know how I clear these D4 341 error messages? Pressing reset and holding it etc doesn't get shut of it. So I don't know if it is a current problem or not regarding the temp rising too fast.

Yes, just install your own one.

Don't know how to clear that message.

Does this mean things will cool down more in the house?

Does increasing the time for 2.3b basically achieve the same thing? - forces the boiler to wait longer between firing cycles?

Yes, but once you determine the Highest minimum flowtemperature to get the boiler away in one go then IMO you are better off using option 2.3.C as that should give the shortest recycle time.

The house will cool down more the lower you have to reduce the flowtemperature but remember the rads will still be emitting heat, at a flowtemp of 38C the rads should be be emitting more than half the heat they emit at 53C so not a big deal even if the recycle time is as high as 10 minutes.

 

[John Smith Esq.]

Yes, just install your own one.

Don't know how to clear that message.

Yes, but once you determine the Highest minimum flowtemperature to get the boiler away in one go then IMO you are better off using option 2.3.C as that should give the shortest recycle time.

The house will cool down more the lower you have to reduce the flowtemperature but remember the rads will still be emitting heat, at a flowtemp of 38C the rads should be be emitting more than half the heat they emit at 53C so not a big deal even if the recycle time is as high as 10 minutes.

I've had good advice here, thanks.

Excuse my ignorance, but when you say "get the boiler away in one go" - what exactly does this mean, what is the objective? Is it to have a longer burning cycle without the chopping and changing of stop and start?

 

[Johntheo5]

Excuse my ignorance, but when you say "get the boiler away in one go" - what exactly does this mean, what is the objective? Is it to have a longer burning cycle without the chopping and changing of stop and start?

Yes, exactly, if the flowtemp was very high at refiring then you could have a situation where the boiler would never fire for more than say 30 secs or so, and just repeatedly recycle, then the house would certainly get a lot colder?

 

[dilalio]

So installing a new one outside boiler will do the job of the possibly seized one inside the boiler?

Not really, your boiler acts as an arch in the pipework and will catch air within it.
That's why combis have a built in AAV.

They often leak if system is dirty so regularly get shut down to stop a leak.

Should be checked for correct operation and changed if necessary - they're there for a reason.