In April 2010 I have installed a Noma non programmable thermostat in the bathroom with a heater/fan and when I put it on it works for about 2-3 minutes the numbers on the display disappears,shut the heathher,comes back by itself cause cannot stop it by pushing the buttons comes back and the heater start again.Do I need to replace the thermostat or is it simply not weel installed?if so can I get reimburse as I don`t have the cover box to return it to Canadian Tire.Any answer will be