Potterton Netaheat Boiler Stat fault ?

[Doods]

Hi all

As you have all helped me in the past, please can I ask for what may be obvious answers to my queries.

I think that I have finally got to the bottom of my central heating cutting out issue. I have noticed that the boiler is not cutting with the Boiler stat, you can turn the knob up or down after the boiler has been on for a long time and nothing happens. However if i turn up the Room stat (say 90deg) or cylinder stat (say 80deg) so that it continually calls for heat, after a while the boiler cuts out via the override safety switch under the boiler.

I have done some internet research and find that the Potterton part no 404500 has now been superseded to 907729.

Q1 Do you think that I am correct in mw diagnosis
Q2 Can I repair it
Q3 have I got he right part number

Thanks again all for your time and help.

 

[Doods]

HELP

Please somebody. All i mainly would like to know is do you think that my Boiler stat is broken

 

[Agile]

It does sound as if the boiler stat may have failed.

However replacing it involves opening the combustion chamber which should only be done by a competent registered engineer.

Thats particularly relevant with positive case boilers like yours!

Tony