Why does my furnace go into lockout?
If fuel pressure is too low, or if the temperature in the heat exchanger is too high, the switch closes. This tells the furnace to shut down and go into lock out mode. Sometimes a dirty air filter can reduce air flow through the furnace to a point where the heat exchanger limit switch trips.
What causes a furnace controller to lock out?
Here are the most common lockout culprits explained. Defective flame sensors are one of the most common causes of lockouts. When your furnace begins to start, the sensor checks for the presence of fire. If the sensor is faulty or dirty, it won’t be able to detect the flame and the controller will stop the ignition sequence.
What kind of lockout does a furnace have?
There are two main types of furnace lockouts you should know about – a hard and a soft lockout. 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.
What does it mean when your boiler lock out?
Boiler lockout is a term used by the boiler manufacturers, this means that the boiler has shut down due to any fault or anything which is not under the parameter of the boiler. If you are experiencing the boiler lockout you can press the reset button visible on the boiler. This can help the boiler to prevent from lockout.
What should I do after resetting my furnace lockout?
In fact, most annual furnace inspections involve a technician cleaning the flame sensor as part of the preventative service visit. A furnace that cycles on and off quickly, especially after resetting a lockout, often has a dirty flame sensor.
What cause my furnace to go into lockout?
- No Ignition. Common causes of furnace lock outs are a defective igniter or defective flame sensor.
- the furnace stops the ignition sequence.
- Limit Switches.
- Resetting Furnace.
What does “lock out” mean on a furnace?
If one of the sensors reports an unsafe condition, the furnace controller shuts off fuel and power to prevent unsafe operation. This condition is known as lock out. Your furnace normally will remain in the locked-out state until you manually reset it.
What does “ignition lockout” mean?
When a sensor detects an unsafe condition, the furnace controller will shut off the power and fuel to prevent hazards. This is known as an ignition lockout, a condition that can be caused by a number of different sensors found in your furnace.
Why does my furnace not light?
A number of reasons can cause the wall furnace to not light, including a damaged thermocouple, a clogged pilot orifice and a disconnected gas supply.
