Your fan limit switch is located
inside the furnace panel cover
, usually near the upper right corner. The fan limit switch is responsible for turning the blower on and off at the appropriate times.
How do I turn on my furnace fan?
- Move furniture or obstacles away from the warm-air supply register and the cold-air return.
- Locate the household thermostat. …
- Switch the fan setting to “on.” Listen for the sound of the blower turning on.
Do all furnaces have a fan limit switch?
Fan/Limit switches are used on all types of building heating furnaces
. CLICK HERE to see a CLOSE-UP [image] of the FAN OFF, ON, and HIGH LIMIT OFF factory settings on this fan limit control. 1- FAN OFF: the low temperature at which the furnace blower fan will STOP to prevent blowing cool air onto room occupants.
Why is my furnace fan not kicking on?
If you see or hear the fan turn on, your blower motor is not the culprit. If the fan does not start, you have
a wiring issue (circuit breaker trips)
or motor problem (circuit breaker does not trip). While your thermostat may be at fault, only an HVAC technician can diagnose and remedy the issue correctly.
What does a furnace fan switch do?
To put it very simply, the furnace fan limit switch is
a control that tells your furnace's fan when to turn on and off
. So, when the furnace isn't on, it tells the blower not to operate (and send cold air into your home) and when the furnace is on, it tells the blower to turn on and start circulating the warm air.
Will turning on furnace fan cool house?
Running the furnace fan can help circulate the air in your home. But while those portable fans are great to sit in front of, turn them off when you leave. “When you leave the room, it has very little function,” he said. “They don't cool a room down,
they cool people down
.”
Can a furnace fan run all the time?
As previously mentioned, newer models of furnace systems include
fans that are designed to run continuously
. Assuming that your heating equipment was properly installed by a professional and has correctly-sized ductwork, letting the fan run continuously may actually help extend its service life.
How do I know if my fan limit switch is bad?
The most common sign of a malfunctioning limit switch is
the continuous operation of your furnace's blower
. Just as the limit switch won't allow the fan to turn on until the warm air has reached the right temperature, the limit switch also shuts down when the air cools to a certain temperature.
Can I bypass a limit switch?
1 Answer.
Yes
, you can bypass the high limit switch for testing.
How do you reset a fan limit switch?
- Locate your furnace's heating duct. …
- Locate the white limit switch. …
- Look at each arm to identify the settings. …
- Identify the component (setting) located in between the two arms. …
- Set the temperature on the middle component to approximately 105 to 115 degrees Fahrenheit.
How do I know if my fan motor is bad?
- The fan won't start even though the AC is on. …
- The fan continues to run, even when shutting off the AC. …
- The fan is on but rotating very slowly. …
- The fan runs intermittently. …
- There's a rattling or buzzing noise coming from the condenser unit when the fan is turned on.
Should my furnace switch be on or off?
The
furnace should not turn on until the temperature of your home signals it to do so
. The thermostat would have to read below your set temperature in order for the furnace to start heating up your home. If the thermostat doesn't dip below this number, then your furnace isn't going to run.
How do I adjust the fan limit on my furnace?
For a general guide, set the
two lowest ones (from the furthest left) to 100 and 130 degrees
to control when the fan comes on and goes off. The third marker should be set around 200 degrees as a safety shut-off for the burner.
How much does it cost to replace a furnace fan?
On average nationwide, a furnace blower motor replacement costs
$400-$600
, including parts and labor. A single-speed blower motor costs around $450 to replace while a variable-speed motor costs $600+.
