ariston micro 23.MFFI air pressure switch

[ladybreaker]

Hi, I had a fault with my Ariston A23/MFFI Microcombi., the first corgi came around and said too many fault to fix the boiler and advised to replace it.
Before doing so and being an electronic engineer I decided to check for dry joint on the PCB and loose wiring .
When the boiler was fitted about 7 years ago , the engineer gave me the servicing instructions, therefore I could go through the fault finding flaw chart.

And I discovered by coincidence that when I was touching the High voltage harness connector the boiler was working OK.So I ordered the complete harness and replace , but I did not noticed that the air pressure had 3 spades and there are only 2 wires going to it, I'm not sure which of the 3 spade do I connect the two wire.
First I connected them to the 2 opposite spade and the boiler did not fired up and the fan was not spinning. but if i use the top and right spades , the fan spin and after few seconds the boiler works OK.

I was not sure so I left the boiler off till I ascertain the right connection for the air pressure switch.

I hope some can assist on this

Thank you

 

[Dan Robinson]

http://www.gassaferegister.co.uk

Enjoy.

 

[ladybreaker]

Thanks Dan

Do you know one of them who is not going to replace my boiler for a loose wiring like my first Corgi register engineer.

 

[Agile]

We don't give DIY advice on gas or combustion related matters.

DIYers are not advised to open the sealed combustion chamber as you have done and certainly not to touch the air switch when they don't understand its operation or connections!

Potentially very dangerous and the advice would be to get a competent engineer to check its safety.

Tony

 

[Dan Robinson]

Thanks Dan

Do you know one of them who is not going to replace my boiler for a loose wiring like my first Corgi register engineer.

Not referring to corgi would be a good start.

Finding an engineer to come and piece a boiler back together that you disassembled carelessly might be tricky. They will be wary of being liable for an appliance that has been ballsed up by someone else.

 

[ladybreaker]

Thanks Dan

Do you know one of them who is not going to replace my boiler for a loose wiring like my first Corgi register engineer.

Not referring to corgi would be a good start.

Finding an engineer to come and piece a boiler back together that you disassembled carelessly might be tricky. They will be wary of being liable for an appliance that has been ballsed up by someone else.

Without disrespect Dan , you might me an excellent gas engineer and if you were locally I would called you to fix it and service it but you should not comment how carelessly the boiler was disassembled if you have not see it.
In my time when I was repairing TV and vcr, I never refused to repair those items regardless if others engineers have failed, I was good at what i was doing
.[/quote]

 

[Agile]

Perhaps so, but VCRs don't operate on gas which can explode or produce CO which can poison you.

About the most hazardous component you are likely to find is a selenium rectifier! Many years ago though.

Tony

 

[ianmcd]

An electronics engineer and you dont know what C,NO and NC means on a micro-switch ? the mind boggles

 

[ladybreaker]

I KNOW exactly what exactly means common, normally open, normally close , I new I was doing a big mistake to ask for advice and a bit of chat in this forum, but instead what I'm getting is critics and insulations.

You are doing exactly what the american are doing with the Navy and the Army.

Thank you very much ,Dean, Tony, Agile and Ian

 

[Dan Robinson]

You don't have a problem with the insulations .

But, you do seem to have a problem with being told the truth.

We get it here all the time with people claiming to be an engineer of some description, yet have been flummoxed by something that:

a - they shouldn't have touched in the first place
b - have demonstrated the fact by asking for advice on a DIY site of all things
c - if they were half as good am engineer as they thought they were they wouldn't have gotten into the mess in the first place. Especially if as they had the instructions.

There's no point in you getting upset or grumpy with us. It's not or fault.

 

[ianmcd]

I KNOW exactly what exactly means common, normally open, normally close , I new I was doing a big mistake to ask for advice and a bit of chat in this forum, but instead what I'm getting is critics and insulations.

You are doing exactly what the american are doing with the Navy and the Army.

Thank you very much ,Dean, Tony, Agile and Ian

Then you have answered your own question

Common needs one wire so Im sure you can work out where the other one goes, its not that we dont want to tell you , the site rules prevent it and rightly so , you may be capable of doing this but that doesnt mean that someone else reads the reply on this open forum and gets it wrong when they try to fix their own boiler, the APS is one of the most important safety devices on your boiler and Im sorry that you came across a so called engineer that wanted to just change your boiler , unfortunately there are a lot of them around

 

[ladybreaker]

Hello friends,
From my last post I got the boiler working but it stopped again after seven days, this time the red led lockout was coming on both HW and CH.

So I have arranged for a Corgi to come over to fixit, he came yesterday and after making some tests and calling few frinds for tips he came to the conclusion that the PCB need replacing.
Came back again last evening replaced the PCB and unfortunatly no joy.

I spoke to him this morning and said that maibe he was given the wrong pcb version and he is coming back tomorow with a different PCB.

Is ther any tips that you want to give me to pass to him.

Thanks

 

[Agile]

I hope that you are not expected to p ay for a new pcb that does not fix the boiler.

There are a few different pcbs for these boilers.

Tony

 

[TCCHeating]

Not referring to corgi would be a good start.

Youre not listening ladybreaker?

 

[ladybreaker]

I do not intend to pay more than what I was quoted to replace the pcb and have the boiler working again
Yes I think the engineer is aware of pcb variations and hopefully he is coming tomorrow with the right one and hope that the pcb was the problem
Thank you for replying