Worcester Heatslave Senior 12 Boiler problems

[flipflop104]

The pilot light on the above boiler would not stay lit and I have replaced the thermocouple with a HSS-001 Universal Thermocouple length 900mm. The existing one was 600mm. The pilot light still won't stay lit. I followed the instructions for re-lighting the boiler, ie. everything switched off, electric supply, thermostat controls and timers, but the pilot light still won't stay lit.
Am I missing something?
I believe the thermocouple is the usual source of the problem when the pilot light won't stay lit.
Any suggestions?
Thanx in advance

 

[HarrogateGas]

Have you checked for continuity across the over heat stat?

 

[COG]

If you were qualified i would sugest you replaced the pilot injector and got the corect Honywell thermocouple you pilot flame may look ok to you but you cant tell for sure. That boiler has to be well over 20 years old so make sure all sals are replaced as you go. S ome of the seniors had a limit stat interrupting the thermocouple as Harrowgate gas said but the main problem with the stas was the leads going hard over time createing too much resistance.

 

[BOB.DOLE]

The pilot light on the above boiler would not stay lit and I have replaced the thermocouple with a HSS-001 Universal Thermocouple length 900mm. The existing one was 600mm. The pilot light still won't stay lit. I followed the instructions for re-lighting the boiler, ie. everything switched off, electric supply, thermostat controls and timers, but the pilot light still won't stay lit.
Am I missing something?
I believe the thermocouple is the usual source of the problem when the pilot light won't stay lit.
Any suggestions?
Thanx in advance

sounds like the gas valve is nackered are you sure you have put the thermocouple in right and this should be done by a corgi engineer,