Have HVAC Questions? Ask an HVAC Expert for Answers
Welcome to Just Answer, my name is ***** ***** I will do my best to help you with your issue. First I’ll need some more info so I have a more complete picture of you situation.
What is the brand and model number of your unit?
I need the actual model number off the rating tag. What you gave me is the series.
You have to check the rating tag which is usually inside the burner compartment.
What are you getting for a flash sequence on the LED on the control board?
There should be a small viewing port on the blower compartment panel that you can look through to see the LED. Don't remove the panel it will kill the power and put out the LED.
Do you see any light in there?
If the panel for the blower compartment is securely in place you either have no power to the unit or a problem with the trans former. Has anyone shut any switches off? Do you have a meter to do some voltage testing?
Then the only thing you can do is to double check that the service switch (near the furnace) is on and the breaker hasn't tripped. There's also a small chance that the safety switch behind the blower compartment panel has failed. You could try disconnecting the 2 leads connected to it then connect them together. Best to turn the power off to the furnace before you try that then turn it back on once they are connected. There could also be an emergency switch (red switch plate) outside the area where the furnace is located. It should be high on a wall, much higher than a normal switch but you might not have one.
You could have a bad control board because you should see that LED lit up (flashing or steady) if it has power. Try this, turn the power off to the unit wait a minute then turn it back on. The first thing that should happen is the draft (small) fan on the front of the unit should start, next the igniter should glow then the burners should fire up. Tell me what happens.
Does the igniter glow? The area where the burners are will light up with a red glow
Ok, you could have a bad board or a bad gas control valve. There's no way to tell which one it is without a volt meter. But the board should be giving you a flashing LED error sequence
Well I've narrowed it down to a couple possibilities. If you don't have a meter I can't go any further with you. It's probably best to leave the repair of either to a pro anyway. Now you know what the likely culprits are so you won't be completely in the dark when the tech comes to fix it.
That's an indication that the pressure switch which is supposed to check the draft is not closed. This should not be possible since you say the igniter glows. With this error the igniter should not glow
My last answer still applies
I don't see the igniter glowing on the first try. Then you might get the 3 flash error. You shouldn't get a 3 flash after the igniter glows. After the igniter glows and it shuts down you should get 1 flash
Ok so my original conclusion still applies.
I'd appreciate a favorable rating
Use the stars at the top of your page. I'd appreciate 4 or 5 stars.