What does pressure switch open Fault mean on furnace?
Your furnace creates gases (some of which are poisonous) during the heat-creation process. If there is an issue with your draft inducer motor, your pressure switch will open (or “turn off”), shutting down your furnace down by preventing it from igniting.
Why is my furnace blinking 3 times?
Three LED flashes. This means your furnace has an open pressure switch circuit or the induced draft blower is operating when it shouldn’t be. First, you need to locate your circuit breaker and switch off the power supply to the furnace. Then, if you see that the button is up, push it to reset your furnace.
What causes a pressure switch to be stuck closed?
A blockage in the vent will also cause a pressure switch to not close. Water in the vent due to a sag in the piping could cause a pressure switch not to close. Ice on the venting or a plugged screen on the vent termination (only on 90% efficient furnaces) could also be the problem.
What does blinking light mean on furnace?
When you see a flashing light, your furnace is sending you an error code. Similar to morse code, this blinking is made of dots and dashes. If you are looking at your furnace and do not see a red light at all when you know it should be on, that means your furnace is not receiving power.
Why is my furnace light blinking 4 times?
It means that your safety circuit through your high limit is open, when it should be closed. This is usually from a limit which is open (broken) or because a wire or connection anywhere on this circuit is broken or loose.
What does it mean when a TPMS warning light flashes?
If the light flashes for one to two minutes, it indicates there is a malfunction in the TPMS system. There are many situations that can cause a TPMS warning light to come on or flash.
What happens if you have a hole in the pressure switch?
This hole in the heat exchanger will not allow the negative pressure that the pressure switch needs to close and operate properly. If you find that you have a hole in the heat exchanger then you need to replace the heat exchanger or get a new furnace because this creates a dangerous condition that can allow carbon monoxide into your home.
What causes a furnace to have a pressure switch problem?
Some other things that cause furnace pressure switch problems are: (1) A restricted vent pipe (2) Too long of vent piping and too many turns which exceeds manufacturer’s recommendations (3) a stopped up condensate drain line if you have a high efficiency condensing furnace. (4) a dirty or stopped up draft inducer.