Baxi Combi 105 HE problem... :(

[mark d3]

james where abouts are you i can put a request up in the plumbing forum for someone to sort this for you,they will do you a good turn or i will ban them LOL

[James.uk]

Mark.. PM sent..

Colvey. The fan runs OK and can be heard easily, but as often as not, instead of firing up, I get a flashing light above the fan icon. And when that happens the unit wont fire up..

As you say, it's the air pressure valve at fault, but getting someone to come and fix it's a megga problem!!!!

If all else fails, I will buy the part and a try a DIY..
...

When it is working properly, from cold the house gets warm in about 10 mins.. It's only a two bed terrace.

[HarryM1BYT]

Originally Posted by James.uk

Mark.. PM sent..

Colvey. The fan runs OK and can be heard easily, but as often as not, instead of firing up, I get a flashing light above the fan icon. And when that happens the unit wont fire up..

As you say, it's the air pressure valve at fault, but getting someone to come and fix it's a megga problem!!!!

If all else fails, I will buy the part and a try a DIY..
...

When it is working properly, from cold the house gets warm in about 10 mins.. It's only a two bed terrace.

It sounds like your BG friend got it right and you do not need to be gas qualified to swap the sensor, but often these sensor are adjustable. Maybe worth turning the gas off and you can safely try running the boiler, without it actually firing.

[James.uk]

??? Hi Harry.. I think ---- That if the fan comes on properly, that works the diaphragm and signals the ignition to light the gas..

Soo, As the fan is coming on, the diaphragm must be faulty.

So at this juncture no gas is involved. Once the new diaphragm is in place, then hopefully everything will work as it should, and gas will then be part of the process...

I don't think there are any gas pipes in the top section of the unit where the air pressure valve lives..

But.. I am going from the drawings in the hand book so I may have misread them..

UPDATE. YAYY. I got a phone call earlier from a friend of Marks, offering to fix my boiler, either Monday or Tuesday morning, dependant on the part arriving.. Will keep you posted........

PS, the heating has started to work intermitantly, so maybe the diaphragm is now working erratically, whatever, it needs replacing anyway..
...

[stocktake]

Gentlemen, once you open up the case of a balanced flue gas appliance regardless of if it is natural draught flue or fan assisted flue you are disturbing the sealed compartment in which it operates, in effect you are opening the flueways. Once you have done this you are responsible for it's safe working condition and you do need to be not only suitably qualified but also you need to have your competencies registered. To allow the further safe working conditions of the appliance there are various tests to complete. If the controls worked on are outside the sealed compartment of the appliance then the above may not apply

[Johnny the Fox]

I think Dave is referring to is Regulation 3.1/3 and 26.9 in the Gas Safety(Installation and Use) Regulations 1998 which state :-

3.—(1) No person shall carry out any work in relation to a gas fitting or gas storage vessel unless he is competent to do so.

3.-(3)....and is a member of a class of persons approved for the time being by the Health and Safety Executive for the purposes of this paragraph.

26.-(9) Where a person performs work on a gas appliance he shall immediately thereafter examine—

(a)the effectiveness of any flue;
(b)the supply of combustion air;
(c)its operating pressure or heat input or, where necessary, both;
(d)its operation so as to ensure its safe functioning,
and forthwith take all reasonable practicable steps to notify any defect to the responsible person and, where different, the owner of the premises in which the appliance is situated or, where neither is reasonably practicable, in the case of an appliance supplied with liquefied petroleum gas, the supplier of gas to the appliance, or, in any other case, the transporter.

[Johnny the Fox]

Originally Posted by stocktake

Gentlemen, once you open up the case of a balanced flue gas appliance regardless of if it is natural draught flue or fan assisted flue you are disturbing the sealed compartment in which it operates, in effect you are opening the flueways. Once you have done this you are responsible for it's safe working condition and you do need to be not only suitably qualified but also you need to have your competencies registered. To allow the further safe working conditions of the appliance there are various tests to complete. If the controls worked on are outside the sealed compartment of the appliance then the above may not apply

I understand where you are coming from but technically the fan pressure switch is a safety device, which prevents the appliance firing without the fan running, so legally would James be allowed to replace this

[mark d3]

i have had my mate lee sort it he is a very knowledgeable gsr engineer and a lot closer to james than me

[mark d3]

Originally Posted by Johnny the Fox

I understand where you are coming from but technically the fan pressure switch is a safety device, which prevents the appliance firing without the fan running, so legally would James be allowed to replace this

no as its part of the fan safety circuit and the combustion door would need to be removed top replace it

[stocktake]

Originally Posted by Johnny the Fox

I understand where you are coming from but technically the fan pressure switch is a safety device, which prevents the appliance firing without the fan running, so legally would James be allowed to replace this

Incorrect John, sorry, As Mark says, it is within the combustion seal. you need to be qualified AND registered you would then carry out your 26/9 checks (F.A.G.S.)