What causes a hard lockout?
Hard Lockout: Caused by a failure internal to the control or by a system fault such as flame out of sequence. A Hard Lockout will result in a no heat condition. Step 1: Check the boiler’s pressure.
What should I do if my furnace is in lockout mode?
Furnace Lockout Reset Procedure. Though lockout mode errors and resets do vary from manufacturer to manufacturer, most use a simple reset procedure that involves turning power off to the furnace for thirty seconds or longer and turning it back.
What causes a gas furnace to lock out?
After the third attempt, your furnace will most likely go into a locked-out state. If your gas furnace has a pilot light, the lockout may also be caused by its failure to light the main burner. Your furnace also has a limit switch that monitors heat exchanger temperatures and fuel pressure.
What should I do if my furnace wont turn off?
If your furnace doesn’t have a switch, simply ignore this step and move on to turning off the breaker. The light switch will typically have a faceplate and an electrical box to house the wires, just like a regular outlet. If you flip the switch and your furnace kicks on, you were probably trying to troubleshoot the furnace when it was off!
Can a dirty air filter cause a furnace to lock out?
All furnaces need to have adequate ventilation and a dirty air filter can cause a system lockout to occur. For example, a clogged air filter may prevent an adequate supply of air from entering the system’s cold air return that causes the heat exchanger limit switch to trip. The remedy to this problem is simple – replace the air filter.
When does a gas furnace go into lock out?
Gas furnaces with pilot lights will go into lock out if the pilot light goes out or if the pilot light fails to light up the main burner. Furnaces also include limit switches that monitor fuel pressure and the internal temperatures of the heat exchanger.
What does soft lockout do on a furnace?
As we’ve already explained, your furnace controller will stop the ignition sequence and prevent unsafe operation if the sensor doesn’t detect the flame within a set time period. This semi-shutdown is known as a soft lockout, and you will be able to attempt to start the furnace again, usually two more times.
How can I get my furnace out of lockout?
The exact 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 replace the flame sensor: Inspect the furnace flame sensor to look for cracks and signs of damage. If you notice only soot or slight corrosion, follow our guide on cleaning flame sensors.
Why does my furnace not ignite when I Turn on the heat?
5. The Pilot Light (Faulty Ignition Sensor) The pilot light or ignition sensor is usually the most common issue when your furnace will not ignite. This is typically the problem if you can hear your furnace click on but it does not fire up.
