Outside unit was not on. What may be happening is that your aux heat is turning on when your thermostat falls to 68, but then it turns off when it reaches 70, but the heat pump stays on trying to get the house up to 71. (Assume the outside temperature rises to 45 in the day and drops to 25 at night.) This problem/situation is extremely common and it generates many service calls. If the temp falls another degree or two (mine is adjustable), it realized that the heat pump can't do it on its own, so it calls for aux heat. My heat pump will not shut off after reaching the temp setting on the thermostat. Check the Filters. Does the air coming from the registers get cooler after the set temp is reached? This is a very common furnace problem, and can be very frustrating if you are trying to maintain a comfortable indoor environment at just the temperature you like. TURNING THE HEATING OFF INSTEAD OF USING A SETBACK TEMPERATURE. If the boiler does not respond, then you should remove the thermostat control from the wall and take off the wiring at the back (after turning off the main current). Otherwise, the mercury switch may be tilted and the reading of the room temperature off. It actually starts blowing cold air. Then, for information on how to install it, see How to Install or Replace a Thermostat. Make the "z80asm" assembler place an instruction at a known memory address. For instance, if you set your thermostat to 100 degree when it’s below zero outside, your furnace will continue to run and struggle to hit that temperature. How can I read local files from blind XSS? Can I safely reconnect thermostat wire on furnace controller? Check that with a small torpedo level. Why is the Pauli exclusion principle not considered a sixth force of nature? This may not be the answer, but here's what I make of it... Heat pumps have a maximum temperature they can reach when it's cold outside. Which scenario uses less energy in home heating, and thus saves more money: (a) before going to bed, turning the thermostat down from 68 degrees Fahrenheit to 60, then turning it up again in the morning, or (b) leaving it at 68 all night? Check the Batteries If your thermostat is not totally level, the mercury switch within it can cause the temperature readings to be wrong. I have a KG6RA 072C 16B, the blower runs but the gas burners don't ignite. There are reasons why your heat pump does not reach temperature set on your thermostat. This would cause the furnace to shut off before it actually warms the house enough. Please see Home Thermostats Buying Guide. First, be sure your thermostat is mounted on the level with the wall. What my heat pump thermostat will do is call for heat when the temperature drops more than one degree lower than the set temp. For example, this morning I set it to 73 degrees, turned the fan on auto and turn the setting to heat. Adjust the temperature higher or lower to see if that has any effect on the length it stays on or its likelihood of shutting off. Why won't my heater turn off when it reaches my desired temperature? we are having is that it runs constantly no matter what temp. If it’s not shut properly, then the door switch will not activate the central HVAC system. Don has:• Over 30 years’ experience as a remodeler and builder.• Written more than 30 home improvement books.• Served as Senior Editor at Home Magazine.• Appeared as a segment host on HGTV’s “The Fix” for 3 seasons.• Been a featured expert on MSN.com, US News, and many others.• Learn more about the trusted HomeTips brand! If these steps don’t do the trick and your thermostat is outdated, it may not be worth the time and effort to fix it. How long have you seen it run? Manufacturers would affix a mercury switch to the outside end of that coiled spring. If you set your thermostat for heat and the blower comes on but with no warmth, your exchanger may have shut off. 1 Turn the power off to the heating system. It's normal for a heating system to turn off the heat but keep the blower running for a minute or so to cool off the hot components. Thanks for contributing an answer to Home Improvement Stack Exchange! amzn_assoc_tracking_id = "widget05-20"; … Check Your Thermostat. I recently purchased the Honeywell Wi-Fi Smart Thermostat (model #:RTH9580WF). According to the Energy Saving Trust, here are five common myths - busted. Once it becomes clear that your boiler is heating the house when it isn't necessary, you should turn the thermostat down. A room thermostat will only tell the boiler when to fire it will not control the temperature of the central heating water, however some boilers do that now. If your furnace wont shut off and you’re worried, don’t panic. It normally won't turn off until the temp is above the set temp, so it would run until the house got to 71 (again, this is adjustable). What may be happening is that your aux heat is turning on when your thermostat falls to 68, but then it turns off when it reaches 70, but the heat pump stays on trying to get the house up to 71. Thanks for any help you can provide. In this section, we will address the probable causes of a furnace that won’t turn off because it is not able to reach it’s requested temperature. Those primitive models relied on a bi-metal spring to sense temperature. The Honeywell thermostat keeps up and does a better job! Once you set the temperature, your place stays at that temperature. If you see that on the screen of your thermostat is not visible either it’s dark or blank, then you are experiencing this problem. For enhanced energy-efficiency, the best thing to do is lower … Can I host copyrighted content until I get a DMCA notice? It then lets the residual heat of your radiators bring your room up to the right temperature, so you don’t use energy unnecessarily. Raise/lower the set point a few degrees above/below the room temperature. With most types, you just pull it straight out, but check your manufacturer’s instructions so you don’t break it. Old thermostat models have been known to misread settings and misjudge room temperatures, which is why your heating may be turning on and off at the wrong times. 3 Use a soft brush or vacuum with a brush attachment to gently and carefully remove dust and dirt. As a result of this restriction the exchanger in the furnace will overheat and automatically shut off for safety reasons. Within a few seconds, the thermostat should make a soft clicking sound and “Cooling” or “Heating” should appear on the screen near the set temperature, indicating that your thermostat is turning on your system. It is electric. As it goes, you may be able to fix the troubleshooting with a few simple adjustments. It sounds like for you, this temp might be around 70 degrees. If it’s an outdated thermostat, consider replacing it with a newer model. If it's the old 'dial' type, pop the cover off, and you may see a mercury switch (glass bulb with a small ball of mercury inside). 2 Remove the thermostat’s cover. The c … read more It’s not the thermostat, I have tried 3 different ones and it does the same on all of them. March 9, 2009 3:19 AM Subscribe. If your furnace continues to run and won’t shut off, even when the thermostat reaches or exceeds the designated temperature, there are a few steps you can take to troubleshoot your problem. Contractor's Assistant: Did you double-check the thermostat's settings? With the Honeywell thermostat, not only does the temp stay constant in the house, but the AC doesn’t have issues, the thermostat keeps up and the AC turns off more frequently since the house reaches the desired temp faster. The air temp does not continue to drop on the thermostat when it's constantly running, it just stays at the same temp that the thermostat is set to. Goodman heat pump won’t shut off when thermostat reaches set temp. This is why you should NOT turn the thermostat up when it’s cold outside CENTRAL HEATING is a blessing in the cold winter months, when it can feel chilly, even inside your home. If your thermostat is connected to a furnace, check the furnace door. Verify that heating and cooling switch off within a few minutes. Why does the Indian PSLV rocket have tiny boosters? by Don Vandervort, HomeTips © 1997 to 2020, Thermostat Does Not Control TempExtreme Temperature Swings. Reason for non-powered superheroes to not have guns. 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