Gas Furnace Thermostat Blank

For a gas furnace the trouble might be the limit switch.

Gas furnace thermostat blank. The power loss could also be the result of a tripped circuit breaker that powers the air conditioner or heater. How to change the batteries in your thermostat will depend on its make and model but most thermostats have a removable battery compartment that is easily accessible. On the other hand if your thermostat is hardwired to your hvac system for power it could be a temporary blank screen if the thermostat is in the middle of recharging. Most thermostats display a low battery symbol when the juice is running low.

Wait a short time and see if the display returns. In rare cases the transformer could be located in the condensing unit. Most furnaces have a high limit switch that prevents the system from overheating. Overheating typically occurs due to poor airflow or parts that are going bad or broken.

If your thermostat screen goes blank after several minutes of operation it could be due to the high limit switch tripping. Honeywell and other brands of programmable thermostats typically show a blank screen when there is no power going to the wall unit. Power stealing thermostats get their power from the transformer. If your thermostat screen has gone blank and your thermostat runs on batteries the first thing you should try is replacing the batteries with a fresh set.

4 5 out of 5 stars 985. The batteries in your thermostat can last as long as five years or as little as a few months so if your thermostat is turned on but still blank try swapping out the batteries. If it does not read on. Most modern thermostats are powered by the transformer in your air handler or furnace.

Free shipping by amazon. The safety switch was triggered in some homes an air conditioner or furnace can trigger a safety switch and turn off the thermostat entirely if any damage has been detected. The possible reason your thermostat screen can go blank is a loss of power to the furnace. Get it as soon as fri oct 9.

The issue could simply be a broken thermostat. 1 16 of 687 results for gas furnace thermostat emerson 1e78 140 non programmable heat only thermostat for single stage systems. A technician can advise you on whether to fix the unit or replace it with an updated thermostat model.