BAXI 105E BOILER PLEASE SOMEBODY HELP !!

[sterach]

Can anyone please help. We have got a Baxi 105e combi boiler, 4 years old. The problem we have got is that when the CH comes on the temp of the boiler is reaching 80 (maximum) no matter where we set the temperature pointer to resulting in the rads being piping hot to the touch and the boiler overheating and shutting down completely. We are unable to fire back up again until it has cooled. No neons are flashing to indicate a fault, only when the boiler has shut down then the flame failure neon flashes (obviously because it has shut down).
We have had 2 engineers out to no avail, 1 replaced the temp sensor and the other the thermisters but still we have the same problem. We are at the end of our tether and its costing us a small fortune. Can anyone please, please, please help !!!!!!!

 

[fitz1]

try baxi on 08706049049.

 

[ChrisR]

Does the burner modulate as it gets hot (flames reduce)?

 

[sterach]

No, burner stays the same.

 

[Agile]

Sounds like the gas valve needs setting up properly. Only about 10% of CORGIs seem to be able to do that!

Might be PCB fauly but thats less likely.

I was amused that one engineer replaced the sensor and another replaced the thermistor. Lesser minds think alike !

Tony

 

[Baxmax]

Sounds like the gas valve needs setting up properly. Only about 10% of CORGIs seem to be able to do that!

Might be PCB fauly but thats less likely.

I was amused that one engineer replaced the sensor and another replaced the thermistor. Lesser minds think alike !

Tony

10% That is scary

 

[namsag]

Na the scary thing is believing any of the facts figures and chemical reactions Agile comes out with, without checking them out for yourself. Or relating them to all the jobs you have been to yourself .

 

[Baxmax]

Sounds like the gas valve needs setting up properly. Only about 10% of CORGIs seem to be able to do that!

Might be PCB fauly but thats less likely.

I was amused that one engineer replaced the sensor and another replaced the thermistor. Lesser minds think alike !

Tony

10% That is scary

Even scarier

 

[baxpoti]

How is your hot water?

The PCB is not registering the NTC sensors signals.
Even if the gas valve was not modulating down the NTC sensors would still react to the customer setting of the C/H temp and would shut down at a lower temp, min setting being 30* +/- 5*. Unless the gas valve is sticking open!
You say 'flame failure' light illuminates after its overheated, not the 'safety thermostat' light.
My money goes on the PCB being faulty

You could try;
On the PCB there are at least 3 potentiometers (blue dials), find the small one marked Max R and turn it fully anticlockwise this will lower the output of the C/H to approx 10Kw.
Also there are 4 'jumpers/dip switches' on the PCB, Move the one marked T.RISC to on, this should keep the C/H temp to 45* max

 

[garybax]

Had the overheating Baxi problem- just took the advise you gave re-potentiometers and jumper settings- boiler is functioning and house is slowly heating up- Thanks Loads-
i assume this is a temporary fix- do i need a new PCB, or should i look at replacing the thermal switch ?
thanks in advance- all it took was a google.

 

[oph]

Only about 10% of CORGIs ......Tony

FFS Tony, who????!!!!

The queens dogs have had no involvment with gas since 2009

 

[Whitespirit66]

Only about 10% of CORGIs ......Tony

FFS Tony, who????!!!!

The queens dogs have had no involvment with gas since 2009

You need to look at the dates on here.

 

[oph]

Only about 10% of CORGIs ......Tony

FFS Tony, who????!!!!

The queens dogs have had no involvement with gas since 2009

You need to look at the dates on here.

Jesus H Christ, why was this resurrected?

 

[ianmcd]

Only about 10% of CORGIs ......Tony

FFS Tony, who????!!!!

The queens dogs have had no involvment with gas since 2009

Aye but think you should read it again he wrote that in 2007 ?? (was a load of Shoite then too)

 

[garybax]

thanks for all your help-
don't usually spend all my time on forums trying to amuse people who desperately need a laugh.
i'll call an engineer in the morning.