LIMIT CIRCUIT LOCKOUT -- Lockout occurs if the limit or flame rollout switch is open longer than 3 minutes or 10 successive limit trips occured during high-heat. Improper limit switch or no limit gasket. Dirty filter or restricted duct system.
What does 13 limit lockout mean?
It means that the high limit or flame rollout switch is open. This can lead to error code 13, Limit Circuit Lockout. Error 13 means that the limit or flame rollout has been open for more than 3 minutes. To address this issue, we need to ensure the furnace has proper air flow, and increase it if necessary.Nov 30, 2020
What does circuit lockout mean?
MCB / Circuit Breaker Lockouts function by effectively locking out circuit breakers which means that the accidental start-up of equipment can't take place.
What does limit circuit open mean on a furnace?
If the furnace failure code indicates an "open limit" or "open high temperature switch" or "open rollout switch", it is probable that the furnace has overheated. Limit switches turn off the burner and turn on the circulating fan if there is a high temperature condition in the furnace.
How do you reset a limit switch on a furnace?
How to Reset a Furnace Limit SwitchLocate 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.More items...
Why is circuit Lockout used?
A lockout-tagout (LOTO) procedure is a safety system used to prevent accidental or unauthorized access to electrical power sources that are undergoing maintenance or other work.Sep 23, 2019
How does a circuit breaker Lockout work?
0:100:49Circuit Breaker Lockout Explained - YouTubeYouTubeStart of suggested clipEnd of suggested clipJust throws this little piece out of place on the circuit breaker trips.MoreJust throws this little piece out of place on the circuit breaker trips.
Should a furnace limit switch be open or closed?
The fan limit switch should be open when the furnace is off and full of cool air, so you should get an OL reading; if not, there's a short, and the switch should be replaced. The high limit switch should be closed when the furnace is cold, so you should get a zero reading; if you get the opposite, replace the switch.
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.
How do you bypass the limit switch?
2:244:00How To Test and Bypass The Upper Limit Switch On Your FurnaceYouTubeStart of suggested clipEnd of suggested clipMake sure you use a piece of shielded wire i saw in a couple videos people actually used a paperMoreMake sure you use a piece of shielded wire i saw in a couple videos people actually used a paper clip. Absolutely do not use a paper clip.
How do I know if my 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.Dec 10, 2014
How much does it cost to replace a limit switch on a furnace?
Average Cost of a New Furnace Limit Switch Depending on who your OEM is, this component could roughly cost you anywhere from $4 to $25.Mar 11, 2021
Can a limit switch be reset?
Senasys' manual reset limit switches are a temperature sensing device with normally closed contacts. The contacts open (limit) at a factory set point. Once that limit is reached, a human must manually press the red reset button for the switch to return back to the normally closed state.Nov 19, 2019