I disagree with the thermocouple itself being faulty , IMO it's the selector switch.
One trick to try without pulling the fridge out is to , whilst holding the gas valve in and the flame is lit to gently turn the selector switch slightly back away from 'gas' and back to gas , if the indicator twitches slightly or starts to move to the green section , then it's definitely grease on the contacts of the switch contacts.
One trick to try without pulling the fridge out is to , whilst holding the gas valve in and the flame is lit to gently turn the selector switch slightly back away from 'gas' and back to gas , if the indicator twitches slightly or starts to move to the green section , then it's definitely grease on the contacts of the switch contacts.