How do you reset the high limit switch on a Goodman furnace?
Press and hold the red “Reset” button in the center of the rollout limit switch component. Hold the button for one to two seconds before releasing it.
How do I know if my high limit switch is bad?
One of the most common issues that happens when a high limit switch goes bad is that it fails to signal the blower fan to turn off. If your fan keeps running continuously (and you’ve checked that your thermostat is set to AUTO rather than ON), that could be a sign of a bad high limit switch.
Where is the high limit switch on a Goodman furnace?
hot-air supply room
The switch is usually located above the heat exchanger of the furnace in the hot-air supply room.
Can you reset a furnace limit switch?
The function of your furnace limit switch is to tell the fan when to turn off and on depending on the temperature in the home. However, for your own safety, don’t attempt to reset the switch without first consulting your furnace’s instruction manual.
What causes a high limit switch to trip?
A high limit switch will keep tripping due to a dirty flame sensor, short cycling, obstructed airflow, or a defective switch. These lead to overheating within the gas furnace that triggers tripping as a safety measure to prevent fires. Clean and replace dirty and worn-out parts to fix the problem.
Why does my furnace high limit switch keep tripping?
What causes high limit switch on furnace?
If the air inside your furnace gets too hot, the limit switch trips to prevent overheating. If the furnace high limit switch trips due to overheating, there is likely an airflow issue that is preventing proper air movement through the system. A dirty filter is the most common cause of airflow issues.
What causes high limit switch open?
The high limit switch has a flame sensor rod that detects air temperatures in the plenum of the furnace. If it is dirty, it cannot properly detect temperatures, which is one reason why the furnace high limit switch trips.
Can you run a furnace without a limit switch?
Without a functioning furnace limit switch, a furnace would not be able to regulate the temperature in conjunction with a thermostat. Typically, a furnace limit switch consists of an exterior plate and a temperature probe that lives inside the furnace housing.
Can a furnace limit switch be bypassed?
Yes, you can bypass the high limit switch for testing.
Why is the limit switch on my furnace open?
The limit switch shuts off the burner when the temperature exceeds a preset temperature. When the temperature reduces to normal, the burner will come back on. The most common reason for limits to open is a plugged filter or a dirty blower wheel. On the left are some high temperature limits used in furnaces.
What is a high-temperature limit switch on a furnace?
A high-temperature limit switch, also called a fan limit switch or simply a limit switch, is an important device used in forced-air furnaces powered by gas or heating oil. Simply put, it senses the temperature of the furnace and tells the blower fan to turn on and off at the appropriate times.
Where is the fan switch on a gas furnace?
The mounting plate usually contains two or more terminals that receive control wires for the blower fan and the furnace’s gas valve. The location of the switch varies by the furnace model, but it is typically located in the hot-air supply plenum, above the combustion chamber or heat exchanger of the furnace.