It is not a risky task to install a wireless thermostat. First we have to remove the old thermostat and the existing mounting plate. Then after disconnecting the wiring connect the new wires and. finally install the new mounting plate and thermostat. But in your case , I think replacement is a better idea. Otherwise it may consume your valuable time and money again and again. If possible sell it and buy a new one from a reliable showroom and please take care about the brand too. The one I bought before 2 years from Best Brand Appliance in Canada is still working well.