Can anyone help with Potterton Flamingo 50s

[Phoenix69]

Hello everyone.

My custy has an old Flamingo 50s and between 4 to 8 hours of operation the pilot goes out but I cant figure out why. My fault finding on these old boilers obviously needs some work. Any ideas would be most welcome.

 

[adlplumbing]

fan
weak thermocouple
weak piolt light

 

[Phoenix69]

It's a balanced flue so there is no fan & I have replaced the thermocouple and the boiler stat but to no avail & the pilot burner is fine.
Any more ideas? I am beginning to suspect the gas valve may be sticking occasionally.

 

[namsag]

Possibly the gas valve.
if any signs of water it could be heat ex dripping into pilot

 

[Agile]

Shouldn't gas advice like this be posted in the CC ?

 

[compheat]

last time i installed a flamingo was 30 years ago it does sound like the gas valve, you've done everything else