Furnace Error Fault Code Lights - Repair, Troubleshoot, Fix, Diagnose
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- Опубліковано 10 лип 2024
- Read the error codes that tells you what sensor has tripped. It does not tell you why the fault. Do not blame the code sensor light unless you are positive it is the sensor that has failed. Ask Autumn Heating and Cooling in St. Clair Shores, MI.
Thermostat malfunctions are most common heating system failures so check the switches, settings and loose or broken connections. Other reasons are tripped circuit breaker, blown fuse, combustion furnace pilot light.
The furnace diagnostic code lights can be seen through the furnace window or when the front panel is removed.
Different furnaces have different patterns. For example, maybe the light codes are 2 digits - the number of short flashes is 1st digit of the two digit fault code. The number of long flashes of the LED is the second digit of the fault code. A steady burning LED light means normal furnace operation.
Or it means something if the blinking is slow or fast. Like the green light is blinking slowly means the furnace is on but there is no request for heat. A continuous light means that the circuit control board needs replacement, but completely off means the furnace is either off or not receiving electrical power.
If a code refers to gas, ignition failure, or flame proving failure, the problem is the burner assembly area, like the igniter or flame sensor is either bad or dirty.
An oil furnace not coming on may show a red light lit on the burner unit. When on, this red lockout light indicates you are shutdown due to a problem or fault for safety.
A furnace blower motor that stops pushing any air is broken. If there is a steady flow of cold air, the blower is good, but the heat exchanger or burner is not, and inspect for cracks and leaks.
Why does my furnace turn on and off? It could be the flame sensor is dirty.
But the most common cause for your furnace to keep turning on and off is the High-Limit Switch, which turns the unit off if the temperature inside gets too high, as a precaution. This is most common cause of short cycling. A dirty air filter restricts air from getting into your furnace. Your furnace's heat exchanger needs that air blowing over it or it overheats, causing the furnace to shut down. So, change it!
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Most of the time the sensor doesn't need replacing, only cleaning with a fine abrasive or steel wool. The orange flame sense LED illuminates when flame is sensed, not when there is a problem. If flame is erratic, then light will blink. If no flame is sensed, LED will not illuminate. Pressure switches usually have clogged ports where tubing hooks up or intake or exhaust passages are not clear. If high efficient furnace-check the drain. It's probably clogged.
Good tips, thanks, Blair
Thank you for telling me there are charts inside the furnace door with information on them. I was able to find out the pressure switch was open after two separate heating and cooling companies were here and said there was nothing wrong with the furnace. One even said it was my thermostat and charged too much to put in a lower grade than what I had.
Always par excellent Mr hardware!
Good to see you!
Awesome 👍, I know that this video will help people understand for that brand of furnace !
Thank you! 80 degrees in my house and it had been raining all day
You rock Mr. Hardware!
Awesome job thank you
My manual and door instructions do not say what the red led means. It is blinking 9 times and stay in for a while before blinking again.
I notice the red led turns on in your video, but you change the camera position right after it happens. It's it normal?
Good to know
LED 2 blinks after starting the exhaust blower on weather king unit. Pressure switch was not turning on. I tracked the house back to the blower and found I couldn't blow or suck from the hose. Turns out some debris was inside the blower tube outlet which I cleared with a small wire. Maybe carbon crumbs because it sounded grainy. So some advice there on checking the hose and pressure switch before spending money on that switch sensor or even telling a tech to bring one because most likely they'll sell it to you to score an easy job.
I have a solid yellow line but nothing is kicking on after i reset the master switch on the side.
He sure makes it sound easy. Lol.. not that simple most of the time people... What he didn't tell you is that the flame sensor being the problem is if your lucky.. those codes don't tell what's wrong all the time, sometimes a code will come up and its something totally different that's causing that code to pop up
My Honeywell ignition retry seems to be giving off multiple codes but everything seems to be working properly but sometimes the damper flap doesn't open all the way and I just push it a little and it kicks on
That sounds like it needs replacement, CO poisoning is not to be toyed with.
@@MrHardware1 Thank you Of course it happens of the weekend but Iv been going down every hr and making sure Its not stuck and the furnace has kicked on I can't believe a damper is $200+ anyways thanks for the response really means a lot
My problem is when I turn on the furnace, it's go on for a few seconds than turn off. Than my furnace board green and red is flashing. Update code for that is 1 hour lockout.
My lights dont flash. The power light just goes out and the code light stays on and the unit shuts down
Why does my Argo furnace have 2 yellow solid lights ,not blinking??
Look on the inside of the door, access panel, hopefully the codes are listed there. Or call customer service, I don’t know all, barely any, codes. I can only compare my lights to my supplied codes.
My furnace codes don’t even exist on mine. The people who owned this house last ripped the codes off
troubleshoot my goodman hot forced air furnace. Heres exactly what happened.. replaced the original thermostat with a smart thermostat and the ROLLOUT SWITCH kept triggering. So I went back to the original thermostat and as I was doing so the R and the W wire accidently touched my screw driver and caused the led light in the circuit board to show that it has no power.
Next, I checked the on/off switch. All good, 120V. I then checked the junction box on the furnace. All good, 120V. I then checked the cover switch, all good, polarity tested fine.
I looked around and I do not see any burnt wires. made sure there not no disconnected/loose wires, all good. I thought on the circuit board and could I pull a code from there. No light to tell me if there was a code. I have 120 V going to the transformer and 28V? coming out. I checked the 3amp fuse on the circuit board, good.
I'm at the point where I think the circuit board is dead but not 100% sure any recommendations #hvac please reach out thanks!
Yup, looks like you need a furnace man.
My led lights is off
I have an orange light that just keep flashing on my furnace
You will have to look at the schematic and the inside of the furnace door panel, there is usually a description of what all the lights do right there.
My LED light is steady , but my unit turns on but turns off immediately, where do I start looking if the led light is not blinking?
This is a longshot, but the flame sensor, which is in the burner area of a furnace, which is a single wire that sensors to see if there’s flames could be the problem. because if it gets dirty and it doesn’t sensor the flames it shuts the unit down in a few seconds. mrhardware.com/articles-and-videos/heating-cooling/easy-furnace-flame-sensor-repair-clean-replace-fix/
@@MrHardware1 thank you for the quick reply, I will clean the flame sensor and see what happens. I hope it’s not the gas valve, may be a little pricey
Why is it flashing green and red
Look on the inside of the furnace door for your codes.
Why is it so jumpy?
We are amateur video guys trying to put home repair out there.
@@MrHardware1 OK thank you. I respect that and appreciate your effort. I just didn't know if it was something on my end or UA-cam.