Potterton back boiler turning off 30sec.

[norbellini]

My pilot light on the boiler wouldnt stay on ,so i replaced the thermocouple Now the pilot stays on fine Just when i turn the boiler on it runs fine for about 20 seconds and then cuts out along with the pilot light Any suggestions please , we are talking gas now so i wont be trying anything myself .I would just like a bit of information
thanks Potterton fireside 51

 

[Deleted member 267285]

You have already admitted to replacing the thermocouple, which unless competent to do so and check afterwards it would suggest to me if we’re to offer advice that you will be carrying out the work yourself, which is against forum rules.