21 Hours Ago
Welcome to the forum vido.ardes :)
Is this your own home?
Legally only competent people are allowed to work on gas appliances. The way someone is recognised as 'competent' is that they have been trained and are registered with gas safe. What you do in your own home is entirely up to you. However should something go wrong then would you be able to live with yourself? Why not have your appliance serviced by someone GSR. I'm sure they'd replace the t/c as part of the service and charge you additional for the part only, should that be at fault. The T/C is a safety device, if it's tripping out there may well be a reason other than it failing IMHO :)