Important! Why Won T My Furnace Blower Turn Off

If the furnace overheats then a limit switch will open. I would start by confirming that the blower fan will operate.

How To Replace A Furnace Blower Motor And Capacitor Hvac How To

If your furnace fan wont turn off you most likely have one of these 3 problems.

Why won t my furnace blower turn off. If you see or hear the fan turn on your blower motor is not the culprit. Ad The Bay Areas most Trusted HVAC Contractor for all your Heating Cooling Needs. Incorrect setting on thermostat.

This means the furnace blower is pushing out air whether its heated or not through the vents 247. That will cause the burners or heat source to shut off and the fan to run until the limit switch closes again. With most of the issues that we mentioned above the price wont be too high.

CHECK for a MANUAL - ON Switch - At the furnace or air conditioner air handler or blower unit. I use a multimeter to measure the resistance ac. The furnace will run constantly to keep up on a cold night.

Why does my furnace blower not shut off. Why isnt the blower working on my furnace. Theres a problem in your thermostat wiring.

The Bay Areas most Trusted HVAC Contractor for all your Heating and Cooling Needs. Lower the thermostat in order to stop the furnace. Common causes of this problem.

Turn the power back on the furnace. Youll need to have a furnace repair tech fix the rest. Theres a shorted thermostat wire.

Theres a problem in your thermostat wiring. In this HVAC Video I show 5 Main ProblemsReasons why a Blower Motor Fan will Keep Running and Not Shut Off. Broken blower fan motor.

We look forward to serving all your appliance repair needs. The fan limit switch may include a switch that manually keeps the fan running. In some cases the limit switch will stick open and this will cause the fan to run continuously.

This is the Step by Step Troubleshooting of a 120 volt Furnace BLOWER MOTOR that will NOT SHUT OFF. Turn it to AUTO and see if that helps. Your system probably has a manual FAN ON switch on the thermostat or if not there may be a FAN ON push pull switch right on the fan limit switch in the air handler.

In normal operation when your thermostat is set to auto it will tell the blower fan plus the heating or cooling components to turn on and off at the same time when the desired temperature is reached. Start by turning the furnace off turn your thermostat to fan only and wait a few minutes. Your fan limit switch is on manual override.

If your blower motor blew well youre in for a hard time. Common causes of this problem. Check the wiring to your furnaces thermostat.

Youre using the wrong thermostat fan setting. If its a thermostat that was turned all the way up its a nonissue. If you dont know where to find the limit control switch.

Unfortunately youll need a professional to fix those last 2 problems. If your furnace keeps blowing hot air and wont stop the furnace burners arent turning off. If your furnace fan wont turn off you most likely have one of these 3 problems.

I go over the low voltage signal wires that tell the fur. Ad A Technician Will Answer You Now. Your thermostat fan setting is set to ON.

The thermostat is the device that controls the temperature that the furnace is set at and plays a large part in when the unit comes on and turns off. Your furnace fan limit switch is set to manual override. A furnace blower repair can range between 350 to 750 on average for most homeowners.

Theres a shorted wire at the fan limit switch. Ad Get appliance repair from trusted local pros. Thermostat temperature setting is too high.

Thermostat or fan relay switch problem-. Understanding how a furnace works will help you to determine what the cause of the problem. Unless youre familiar with the components of your fan limit switch and how it works we suggest letting a professional repair or replace the switch.

Limit Switch Issue Furnace Blower Fan Wont Turn Off. Well if your furnace blower fan wont stop running you could have any of the following problems. We discuss this switch right here.

If your thermostat is wired incorrectly this could explain why the unit refuses to shut off. Choosing to go it alone is a good idea here since DIY replacement only costs 100 to 125 for a typical furnace blower. Furnace blower wont turn off.

Push the switch to OFF and then to ON. So if your furnace blower is turning on and off when the furnace isnt in a heat cycle it usually means the fan limit switch is defective. The thermostat is what tells these separate systems to work together.

When it comes to trying to gauge how bad of a problem this can be the reason for your furnace being unable to turn off matters far more than the fact that its not turning off. Questions Answered Every 9 Seconds. Your furnace fan limit switch is set to manual override The fan limit switch is faulty and needs to be replaced.

If that does not stop the furnace blower switch. Click to see full answer. What to Do When a Furnace Blower Wont Turn Off Understanding Furnace Blower.

The fan limit switch is faulty and needs to be replaced. Unfortunately you can only fix the first 2 problems by yourself. If your furnace wont shut off you likely have one of the following problems.

It all depends on whats wrong with the furnace blower. If the fan does not start you have a wiring issue circuit breaker trips or motor problem circuit breaker does not trip.

Most Common Causes For A Loud Furnace And How To Fix It