Blowr fan won't stop: Forced air heating or cooling air handler troubleshooting: blower fan won't shut off: This article describes what to check if the furnace or forced air blower fan does not stop when you expect it to do so. Problem: You are running your air conditioner and even when your system cools to the set temperature, the outdoor unit continues to run and just won’t shut off.The indoor unit may freeze up into a solid block of ice. Thermostat issues. We often use the questions we get in the email as a guide to writing articles. Just flip the switch, and you should be set! If the thermostat is not calling for cooling, there will be no voltage present. If your air conditioner is continually blowing cold air and doesn’t shut off even though the set temperature has been reached, you may have a problem with the control board. • Check the circuit box to make sure the breaker for the outside … My system is doing the same thing, and I turned on all power and switches and set the tstat to cool and fan to auto with the temp lower to make the (air handler) furnace activate and when I switch the tstat to off from cool the furnace fan shuts off but the condenser keeps running. If there is an air conditioner, remove the screws to the control panel and pull it off. We noticed that our outside ac unit runs (the fan) even though the thermostat control is set to "off" inside the house. Running the AC last night and the unit outside ended up making a loud electrical sounds like a rock was bouncing around the fan. Solution:. Typically, there’s an on-off switch in a small box near the outside unit. If your blower fan is continuing to run after the system has already turned off and you made sure your thermostat isn’t set to the ‘on’ position, then you’ll want to … Modern window air conditioners often use an Electronic Control Board, sometimes referred to as the PCB, to control the functions of the individual components of the unit. If it's not displaying anything, change out the batteries. … Locate the fan relay. Here's another one homeowners can usually solve. Condensing Unit Frozen Wont Turn Off - What you can expect to learn from Condensing Unit Frozen won’t Turn Off article: this article is an answer from a question taken from our email by a visitor to High Performance HVAC. Air conditioner is turned off but fan keeps running. The topic is a condensing unit that will not turn off, and it is freezing up. When this happens, try the following: • Make sure the AC hasn’t been turned off. Check your thermostat. The system won’t be cooling your home since both sides of the system need to be operating. Check to make sure the fan is not in the fan “ON” position on your thermostat. With a voltmeter, check across the low-voltage coil. 1. Check across the fan terminals. Is this a problem with the unit, or the thermostat inside the house? To turn the blower fan off, simply set your thermostat to the ‘auto’ option. This air conditioner problem can occur on central air conditioning systems or on heat pumps when in cooling mode. I then turned the thermostat to OFF and the sound outside then stopped. 2. Problem: Fan on your furnace runs all the time and will not shut off. Anyway, if the disconnect switch is off, your outdoor unit won't turn on. Your AC might turn on right away! 6. I immediately shut off the AC main power. These same diagnostics also aid in air conditioning blower assembly diagnosis when an A/C blower continues running. 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