I recently had an Amana heat pump and furnace system installed in my home, controlled by a Carrier TSTATCCPHP01-B thermostat. The furnace fires up in the morning (50F outside) despite the fact that the thermostat is set to lock out the furnace for outdoor temperatures higher than 35F (actually the HP is turned on first and then after 15 min or so the furnace fires up until the set temperature is reached). Is it something wrong with my thermostat? Please help!! Thank you.