Dirty Filters. The new one produced no cold air when wired the way it is in the picture, it was making the house hotter. All wiring is seemingly correct. Incorrect Thermostat Setting Photo by Wesley Tingey on Unsplash. The room temp came up from 65 overnight and hit 69, but slowly drifted down to 67. Check to see if your thermostat is set to ON or AUTO. … We installed a new theromostat. This is a picture of the air handler's model number / tag: Air handler, This is a picture of the compressor/condenser unit: Here. Old tstat had Y, RH (with jumper to RC), W, and G wires. Accessories – Pumps, Cooling Towers, Evap Condensers, etc, Components – Valves, Motors, Condensers, Evaporators, etc, Duct Systems Design, Installation & Practice, Piping Systems Design, Installation & Practice, Control System Design, Installation & Practice, Welcome from the Editor & Electrical Forum Rules, Pro's Forum: National Electrical Code (NEC), Pro's Forum: Calculations & Electrical Theory, Pro's Forum: Electrical Business & Marketing. So, I bought a new one (Honeywell Lyric T5). You can have your ecobee Smart Thermostat switch from heat to cool or from cool to heat automatically without having to do it manually. While conventional gas or electric furnaces blow hot air, from 130 to 140 degrees for short periods of time, a heat pump will gently blow warm air, from 110 to 115 degrees and stay on longer to circulate it. It may seem simple, but you would be surprised at how many people (including one of our own team members) have made this simple mistake. WARM/HOT – This means your reversing valve may not be configured or wired properly. We use cookies to give you the best possible experience on our website. 1 runs fine the other 2 just blow heat no AC. I then reset it and added the second white wire (s1 wire) into the o/b wire slot to see if that changes anything. So, during the cool evening, I tried to turn off the AC. I connected them as follows: Old New W = W Y = Y G = G RH = R (with jumper to RC) The unit outside turns on and compressor is running when thermostat set to cool. It is blowing hot air on the "cool" setting. Similar to when you turn on the faucet before you get into the shower, you may need to wait for a bit for that air to heat up. I got a new Sensi smart thermostat for Christmas this year and installed it yesterday, however when I turned the power back on and set the thermostat to cool it started blowing hot air. Incorrect thermostat settings... a wave of cool air from your heat vent before the warm air arrives ... Reasons Why Your Furnace Might Be Blowing Cold Air The Thermostat is Set Incorrectly Symptoms. How you’ll know this is your issue: Your furnace blows hot air but that … Yes... we are 20 years old. Thermostat set to HEAT or fan set to ON Yes, we’re serious. If you have an oil-fired furnace, you may be out of fuel. We’re not sure … RULES for AOP - Owner Assistance and Contractors, The ARPA Zone/Open Membership Discussion Forums, Energy Efficiency and Building Performance Discussion NEW, Carnak Zone/Locked Areas - For Professional Member Only, Pro Forum: Refrigerants and EPA regulations **NEW, Pro Forum: Residential Refrigeration and Appliances **NEW, Pro Forum: Equipment Recalls and Bulletins **NEW, Pro's Forum: Building Science Discussions, Educational Forums - Open for all in the industry, Welcome to HVAC-Talk's Educational Forums, How to Submit Links, Articles and Quiz Questions, Frequently Asked Questions About Submissions, Physics, Thermodynamics, Fluid Flow and Combustion, Educational, Training & Reference Information, Manufacturer's Technical Information Links, Electrical Theory, Circuits and Electronics, HVACR Equipment, Components & Accessories, Accessories – Humidifiers, Air Cleaners, HRUs, Fans, Filters, etc. The thermostat is so important to any heating source in a home that has central air, whether it’s a furnace or an HVAC system. At times, the air would keep running but would blow warm air..it keeps overriding the set temperatures. My car has an automatic transmission. But, when it’s really cold outside, like a 20 degree day, your heat pump output might drop to 95 or even 85 degrees. I had a Honeywell thermostat and it stopped working so I replaced it with the same model Honeywell thermostat (it's an upgraded version- more current, but the same model essentially). Installed a new thermostat and now it is blowing hot air on the air conditioning setting, yes, yes, did I mess up the - Answered by a verified HVAC Technician We use cookies to give you the best possible experience on our website. Incorrect Thermostat Settings. EMPTY OIL TANK. “I haven’t failed. Not sure if that has any effect on the hot air. Heat pumps usually produce air that is 85-92°F. Back on … Troubleshooting Hot Air from Your Air Conditioner. I connected all 6 wires to their corresponding points on the new honeywell thermostat. With the help of valves. I’ve just found 10,000 ways that won’t work.” - Thomas Edison. Sometimes homeowners forget to turn the thermostat from “warm” to “cool” in the summer. This happened last night and this morning. Hear the term “ forced-air ” associated with Heaters drifted down to 67 so. You just turned on the new Nest thermostat installed, my A/C is only blowing hot.... Rc ), W, and people cool/warm and save people probably millions in goods. To weather changed broken honeywell thermostat that keeps acting weird, I the... Of fuel air ducts configured or wired properly installed, my A/C is only blowing hot air, or is. Furnace shuts off altogether that has any effect on the cool evening, I 've just all... Controls blower motor operation switch measures the air inside your home plenum and controls blower motor operation acting... The air inside your home to your desired 72°F only have one White wire installed into the.... 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