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Third party marks are the property of their respective owners. To learn more about cookies and how we use them view our Privacy Policy. Essentially, a thermostat functions as a switch to turn the heat or air conditioning on or off. If the thermostat is not functioning properly, there are a number of ways you can try to troubleshoot it yourself. Try replacing the batteries and see if that resolves the issue. ![]() In this instance, a message reading cool on or heat on may be part of the blinking screen, as well. For instance, if the unit is not level with the wall perfectly, the mercury switch inside may be tilted. This could cause it to read the rooms temperature incorrectly, which will make the heat or air conditioning kick on too often or not frequently enough. Ideally, the thermostat should also be located at least 5 feet from the floor, and it should not be placed within a closet or cabinet. Look for dust or debris and clean the unit off using a soft cloth. ![]() Honeywell Pro 3000 Troubleshooting Manual To EnsureUse your owners manual to ensure these wires are connected properly. If they are, your issue is more likely related to the furnace or air conditioner itself. Check the circuit breaker to ensure that it hasnt been flipped. If the door to the furnace is open, for instance, the thermostat display may be blank. You should also check the circuit breaker to be sure the breaker hasnt flipped. Use a thermometer to measure the air temperature in the room that houses your thermostat. ![]() In some cases, it may be more cost-effective to purchase a new unit, rather than to replace the sensor alone. She holds a Master of Science in Publishing from Pace University.
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