Typically, there’s an on-off switch in a small box near the outside unit. 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. Check to make sure the fan is not in the fan “ON” position on your thermostat. 1. 6. Thermostat issues. Locate the fan relay. 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. If it's not displaying anything, change out the batteries. Still heard the electrical sound from the unit outside and realized the thermostat was still ON. I then turned the thermostat to OFF and the sound outside then stopped. These same diagnostics also aid in air conditioning blower assembly diagnosis when an A/C blower continues running. Just flip the switch, and you should be set! Check your thermostat. • Check the circuit box to make sure the breaker for the outside … The topic is a condensing unit that will not turn off, and it is freezing up. Your AC might turn on right away! Is this a problem with the unit, or the thermostat inside the house? We currently have the system shut off at the breaker to prevent it from running. … 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. We noticed that our outside ac unit runs (the fan) even though the thermostat control is set to "off" inside the house. This air conditioner problem can occur on central air conditioning systems or on heat pumps when in cooling mode. 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. The system won’t be cooling your home since both sides of the system need to be operating. Anyway, if the disconnect switch is off, your outdoor unit won't turn on. Check across the fan terminals. Problem: Fan on your furnace runs all the time and will not shut off. With a voltmeter, check across the low-voltage coil. Air conditioner is turned off but fan keeps running. Here's another one homeowners can usually solve. 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. 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. If there is an air conditioner, remove the screws to the control panel and pull it off. 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 … Solution:. 2. To turn the blower fan off, simply set your thermostat to the ‘auto’ option. I immediately shut off the AC main power. Running the AC last night and the unit outside ended up making a loud electrical sounds like a rock was bouncing around the fan. We often use the questions we get in the email as a guide to writing articles. If the thermostat is not calling for cooling, there will be no voltage present. When this happens, try the following: • Make sure the AC hasn’t been turned off. 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