Biasi 24s

[CorgiIOW]

Evening fello trades men.
First i dont know a great deal about the said boilers, only that i can get me hands in them, unlike the cdi range. Changed various parts on them DVs, fans, GVs ect.

Now,,, i read in a post some time ago, a problem with having to constantly reset the boiler.

Something about each time you reset the boiler the calibration on variuos componants fail.

Basically i have a boiler that is doing just that, iv done the usual stuff gas pressures, ect .

Sorry for being a little vague, but it is late now.

Any good info would be very much appreciated

Dave.

 

[ACOperson]

What components?

 

[ollski]

I think you may mean the overheat stat which goes out of calibration after it has been reset once or twice...it will basically start cutting out at a much lower temperature after a reset causing constant lockouts.

 

[Agile]

If its the o/h stat thats tripping then its for a reason.

Usually one of the following:-

gas rate set too high.

CH setting not range rated

NTC failed

If tripping just after DHW demand then scaled up main HE

If temp exceeds 65 during DHW then blocked plate HE.

Tony

 

[ollski]

If its the o/h stat thats tripping then its for a reason.

Usually one of the following:-

gas rate set too high.

CH setting not range rated

NTC failed

If tripping just after DHW demand then scaled up main HE

If temp exceeds 65 during DHW then blocked plate HE.

Tony

Can be all those things Tony but it also a known fault on these that the action of physically resetting the oh stat causes them to cut out at a lower temperature afterwards.

 

[Agile]

Yes, thats quite right but you had already mentioned it. It starts off at 110*C and reduces to about 100*C after about 30 resets.

The main point I was trying to make is that the basic cause of the overheating has to be determined and fixed.

Tony

 

[Gasguru]

Always worth removing screwed cap from overheat stat and checking inside - have found stones wedged inside to prevent tripping out!

 

[ollski]

Yes, thats quite right but you had already mentioned it. It starts off at 110*C and reduces to about 100*C after about 30 resets.

The main point I was trying to make is that the basic cause of the overheating has to be determined and fixed.

Tony

Ok no probs was just trying to reply concisely to the original post. The info I have to hand on the prob. says that tests have shown the oh stat to trip out as low as 70 degs after only 3 resets.