any gas central heating bods in the house?

[Invisible man]

my warm air unit packed in last night and I can't get the damn pilot to stay lit

[dirkgently]

Invisible man said:

my warm air unit packed in last night and I can't get the damn pilot to stay lit

On that limited information i would guess the thermocouple has failed.

[Invisible man]

hey, you're good....replaced the TC with a universal one and all is good