Replace DeviregTM 130 Thermostats

Hi, One of my kitchn´s Thermostats keep working when put into shut down condition. i would like to hage an experts to finger out the reason and fix it. Most likely because of the old one and has to replace a new DeviregTM130 or higer version thermostat. It is a small job, but wish the service in a reasonable price. Better if elektriker has similar experience. My living place is close to Tyholt. Regards.