Air Conditioner Blower Fan Won T Turn Off

With a voltmeter check across the low voltage coil.

Air conditioner blower fan won t turn off.

Well if you are going to have a problem with your heating or air conditioning system this is the one to have. If there is an air conditioner remove the screws to the control panel and pull it off. However if the blower continues to run at high speed with either of those tests replace the blower motor control processor. If an inside air conditioning fan unit will not shut off there are a few remedies.

Your furnace and air conditioner simply heat up and cool the air inside of them. Then try removing it. If there is not a voltage reading this indicates the contacts are stuck and the. First try grounding the wire.

This will be a set of contacts that are normally open. Check across the fan terminals. These problems are not easy diy repairs and should be left to an hvac professional. No electrical power to the fan or its controls check for a blown fuse or heating or cooling switch set to off.

Other snafus such as a shorted thermostat wire can also cause the a c or warm air furnace fan to run continuously. Before calling your service technician out to start replacing components check the thermostat settings first. Although your fan never shuts off your heating and air conditioning still works fine. Common causes for fans not turning off when they should include faulty thermostats bad wiring and stuck relays.

Your blower fan is what pulls the uncomfortable air out of your home. Locate the fan relay. Start by testing the gray black wire at the blower motor control processor. If it s not the relay your thermostat likely has a shorted cable or needs to be replaced.

The most common reason that your air conditioner fan won t turn off is because a stuck relay keeping the circuit closed. The only way to get that pesky fan to stop running is to shut it off at the breaker or the emergency shut off switch. At the furnace or air conditioner air handler or blower unit. The fan limit switch may include a switch that manually keeps the fan running.

Wait to see if the air conditioning unit fan eventually shuts off. How your fan normally works. Your blower fan works together with your heating and cooling units but it s really a separate electrical system. If the blower stops with either of these steps the problem is in the hvac control module.

One terminal will be connected to line voltage while the other will go to the fan. If the thermostat is not calling for cooling there will be no voltage present.