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Baxi combi instant 105e flame failure (Read 14033 times)
lovejoy
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Re: Baxi combi instant 105e flame failure
Reply #19 - Apr 10th, 2008, 3:03pm
 
as i sed at the start down to servicing that tube should be cleand with a air duster at each service glad its sorted was becomming a saga lol
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richrtr
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Re: Baxi combi instant 105e flame failure
Reply #18 - Apr 10th, 2008, 12:33pm
 
Thanks Lovejoy for all the help but fingers crossed I think I have sorted it!!!!!!!! Was about to change Gas valve as per book earth wire then pressure sensing pipe.... Followed that up to the brass conecttion in to the combustion chamber and then gently blow and sucked up and down it!!!! then went to doner boiler and did the same ...wow there is a diference in the amount of pressure that could be sucked down the clear pipe .S o changed them over and ,it now fires up with the door fully fitted. The newer one is a slightly different design ????
So did it wear or is the gas valve getting on abit four years and its tolerance for that in put from the pressure sensing pipe is a bit out. I wonder if changing the whole G.V would have did the trick. Fingers crossed now its ok. Cheesy Cheesy
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lovejoy
Re: Baxi combi instant 105e flame failure
Reply #17 - Apr 10th, 2008, 7:11am
 
thort , is the dona boiler a 105 he by any chance ?
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lovejoy
Re: Baxi combi instant 105e flame failure
Reply #16 - Apr 10th, 2008, 7:04am
 
no im saying do those  tests to prove its not the gas valve, a dry joint on the board ? mmm how dose the board know when u have opend the chamber i still think its somthing in that combustion chamber, i have fit boilers from the box and aps dosnt work, the diaphram is moveing with cover off but not with it on i would deffo invest in a new aps for this boiler and double check tubes are rite, if the gas valve or board had gone it wouldnt work cover off or on, its you alowing air into it thats making the diffrence
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richrtr
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Re: Baxi combi instant 105e flame failure
Reply #15 - Apr 9th, 2008, 8:19pm
 
More to last,,,,,,,, but I am getting the flashing neon light,,,,,,,,,,,,,,, and I,m pulling out my hair================ come on the Bris how did you sort it ???????????? Huh
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richrtr
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Re: Baxi combi instant 105e flame failure
Reply #14 - Apr 9th, 2008, 8:17pm
 
So are we saying replace pcb got one shall I fit it in the morning wife is moaning that its cold!!!!!
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lovejoy
Re: Baxi combi instant 105e flame failure
Reply #13 - Apr 9th, 2008, 7:27pm
 
says  PCB- A1 connector has 230v ac across terminals 2 & 4  = yes replace gas valve that is when no gas at burner if not 230v and no flame faliure flashing replace pcb
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richrtr
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Re: Baxi combi instant 105e flame failure
Reply #12 - Apr 9th, 2008, 7:12pm
 
Many thanks for your paitence, yes the fan seems to be running a full speed, the boiler its from was fully working when removed, it had only been fitted for a few weeks last year. so I must belived it ok and the aps too I,ve checked the venturi its clean. whats the chance of this fan and venturi beeing duff and my one? my boiler was good for 4 years before this fault, servied and cleaned every year. The baxi fault chart also says 230 v at gas valve yes = replace gas valve.
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lovejoy
Re: Baxi combi instant 105e flame failure
Reply #11 - Apr 9th, 2008, 6:37pm
 
it is nothing to do with the gas valve as it wouldnt run with case cover off if it wont when on, the gas valve dont know u have the cover off, the fault is deffo somthing inside the combustion chamber u sure the fan is totaly free and running to speed check wires on aps commen  no & nc
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richrtr
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Re: Baxi combi instant 105e flame failure
Reply #10 - Apr 9th, 2008, 6:03pm
 
Checked fan cables via wireing diagram its ok!
as I am getting the spark with the door fully closed , surly I am proving the APS and fan as it going throuth the ignition sequence ? all I am then doing is allowing more air in getting the flame on then fully closeing the door , runs fine untill call for heat cancells then will not restart. All I have not changed is Pcb and gas valve. there is 230 v goes to gas valve so pccd must be ok ? is it the gas valve ?
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lovejoy
Re: Baxi combi instant 105e flame failure
Reply #9 - Apr 9th, 2008, 5:45pm
 
just a thort now dont all laugh never seen it never tryed it but have u got the wires on the fan the rite way earth is easy but L and N if on wrong spades would the fan run wrong way lol dunno as i say
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lovejoy
Re: Baxi combi instant 105e flame failure
Reply #8 - Apr 9th, 2008, 5:38pm
 
nope this is a negative presure boiler, eaven if it was only a 1 year old dona id check the venturis its not the gas valve at all its somthing in that combustion chamber thats for sure
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richrtr
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Re: Baxi combi instant 105e flame failure
Reply #7 - Apr 9th, 2008, 5:03pm
 
Thanks very much for the reply, when I fitted the new fan it was the cowl and all,,,, so new clean venturi plus pipes and and aps, I have a complete one year old 105 for the doner for parts, just get her going for the mrs to have a shower again by letting air in..... via the combustion door, dont want to change the gas valve unless I really have too, but running out of ideas, could the gas valve be sticking????? and cant open against air pressure from the fan, with the door open air pressure less and valve can open ????
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watty
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Re: Baxi combi instant 105e flame failure
Reply #6 - Apr 8th, 2008, 11:20pm
 
hi richrtr. i'd say a pound to a penny its a dirty venturi,(in the flue elbow wher the two rubber pipes from the airswitch go to).when you loosen the cover you allow more air in to the chamber increasing the flow through the venturi. got to be that unless you have crossed the pipes when you put the new airswitch in Smiley(just checking).
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richrtr
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Re: Baxi combi instant 105e flame failure
Reply #5 - Apr 8th, 2008, 8:57pm
 
Hi bris I have the same fault started 2 days ago , straight to flame fail only after a reset and the conbustion door loosely on will I get a flame,
so far new air stwitch £18 and new fan £ 75 still the same fault ,baxi say check flue etc !! done all that, it it pcb !!! but how does it know the door is letting in more air??? Gas valve ??? but it is lighting up ???
please let me know how you are getting on
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lovejoy
Re: Baxi combi instant 105e flame failure
Reply #4 - Apr 3rd, 2008, 9:10pm
 
thescruff is correct, i stil think its down to the flue double check all flue connections next the air presure switch, as it worked sinse service if not has he got the tubes wrong way round on air pressure switch
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thescruff
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Re: Baxi combi instant 105e flame failure
Reply #3 - Apr 3rd, 2008, 12:17am
 
Yes get the guy back out, you really shouldn't be playing with the combustion side
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