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What does ignition lockout fault mean? Is your furnace continually shutting down? Has it stopped responding entirely subsequently several attempts to turn it on? If so, your furnace may exist in an ignition lockout and must be reset.

Modernistic furnaces are equipped with a number of safe sensors used to keep the proper performance of the unit in check. If any sensors detect an unsafe condition, the furnace shuts down to prevent safe hazards or damage to the unit. Unfortunately, the furnace volition remain in this country until you or your local Murrieta heating repair technician reset it manually.

What does ignition lockout fault mean?

When a sensor detects an dangerous condition, the furnace controller will shut off the power and fuel to forestall hazards. This is known as an ignition lockout, a condition that can be caused by a number of unlike sensors establish in your furnace. If your furnace is locked out, it will most probable remain in that state until it'due south reset. Many homeowners transport their furnace into a locked out state when they attempt to get it running several times in a row without success, unaware that the sensor has detected an unsafe condition.

What causes furnace ignition lockout?

Most of the time, furnaces go into ignition lockout because of issues with flame sensors, igniters, or limit switches. Hither are the most common lockout culprits explained.

Defective flame sensor

Defective flame sensors are one of the virtually common causes of lockouts. When your furnace begins to starting time, the sensor checks for the presence of burn. If the sensor is faulty or muddied, information technology won't exist able to detect the flame and the controller will finish the ignition sequence. About mod furnaces will allow you first the furnace 2 more than times before it goes into a lockout.

Faulty igniter

The igniter is another ofttimes encountered lockout culprit. If your furnace igniter does non activate within a couple of seconds, the flame sensor won't detect the flame, and the controller will stop the furnace from starting. Later the third endeavour, your furnace will most likely go into a locked-out state. If your gas furnace has a airplane pilot light, the lockout may also be caused by its failure to low-cal the main burner.

Limit switch response

Your furnace also has a limit switch that monitors heat exchanger temperatures and fuel pressure level. If the temperature is likewise loftier or the pressure level too depression, the limit switch will close, instructing the furnace to shut down and enter lockout style. A muddy filter may also cause the limit switch to trip by reducing the air menstruum. If y'all have a modern furnace, you may be able to tell what acquired the lockout via the status code lights.

What is the difference between a hard and soft lockout?

There are two primary types of furnace lockouts you should know about – a hard and a soft lockout. Equally nosotros've already explained, your furnace controller will finish the ignition sequence and prevent unsafe performance if the sensor doesn't detect the flame within a fix fourth dimension period. This semi-shutdown is known as a soft lockout, and y'all will be able to endeavour to commencement the furnace again, usually two more times.

A hard lockout happens after several repeated soft lockouts. For most furnaces, y'all volition take 3 attempts to relight the unit of measurement earlier it goes into hard lockout. If this happens, you will have to reset the unit manually. The best mode to do this is by calling your get-to HVAC technicians to perform the reset sequence.

How do you fix a furnace ignition lockout?

The verbal procedure for getting your furnace out of lockout will depend on the culprit. Here's what you can do before resetting your furnace:

Clean or supersede the flame sensor: Audit the furnace flame sensor to look for cracks and signs of damage. If you notice simply soot or slight corrosion, follow our guide on cleaning flame sensors. If that doesn't ready the problem, supersede the sensor and endeavor again after you lot restore the furnace from lockout.
Make clean or supervene upon the air filter: A chock-full air filter can prevent adequate air supply to the organization, tripping the limit switch. Simply supplant the filter and come across if the issue has been resolved. It is generally advisable to supersede or make clean furnace air filters regularly to ensure the condom of your family unit.
Audit and make clean the vent pipes: Look for debris and signs of obstruction within your vent pipes and clear any blockage y'all find. If yous are unable to clear the blockage, the all-time course of action would be to call HVAC experts to replace the chock-full pipe department.

Resetting the furnace

Regardless of the culprit, you will have to perform a reset procedure to go your furnace out of lockout. Most modern gas furnaces can exist reset by turning off the power, waiting around twenty seconds, and then switching the power back on. Other furnace models may exit lockout after 1-two hours and endeavor to power on once again. If your furnace has a airplane pilot lite, you may need to relight it following the manufacturer's instructions.

If none of the above-mentioned works for yous, the all-time form of action is to reach out to knowledgeable HVAC technicians and have them inspect your unit and perform the necessary tests and repairs to get your furnace out of lockout.

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