Hi, Trevor, have you checked that you have gas supply to thre fridge? if you have gas, the gas jet may be blocked, if you can't get to it through a rear access pannel, turn off thr gas supply, remove the fridge, now you can give it all a good clean/service, check that the flue is clear, there's usually a baffle suspended in the flue, lift it out & clean it & the flue /chimney, take out the jet & check that it's not blocked with soot/rust that falls down the flue over time.
mee84
July 2010