Hello My name is Ian ~ I am not on the site constantly so please be patient whilst waiting for responses to you queries
Hang on a moment, I assume someone has tried to replace the thermostat without taking note of the wiring? ~ Ian
Second point, can you advise what Manufacturer of the thermostat and model/part number you are using as a replacement ~ thanks ~ Ian
Assuming its using the Chinese thermostat, I have the information for you.