Ok looking at the thermostats on the top the one on the left is more likely to be the problem.
If you have a multimeter you can test it for contonuity. If faulty then look on the thermostat in the middle if theres a small hole there get a pin and poke in in there and push it down. You will feel it click. If it does this then you have just reset it.
If you dont have a multimeter then to check take it off and give it a shake. You should hear it rattle if its ok. If no rattle then its faulty.
If there isnt a pin in the middle then take the thermostat off and then you need to throw the thermostat down onto a hard floor silver side down. So the bottom of the thermostat hits the floor. This will reset it aswell. Give it a shake and if it rattles then its reset.
Refit the thermostat and see how it goes from there.
Let me know what happens.