I have a variable speed 2 stage AS furnace. If the green light is flashing slowly it means the furnace is on but there is no request for heat. The most common cause for this is a leaky gas valve. Question: None of my status lights are on. When I hooked up the extra wires for the a/c, the furnace would no longer work for heating. The high-stage pressure switch is not closing. If there's a little indicator light on your furnace's circuit board (usually visible through a tiny window on the furnace door) and it's flashing, it's trying to help. The issue might as well be with a coated flame sensor. I have HVAC furnace model number KG6RC 080C-12B. Common supply issues include "no gas" incidents that may happen for various reasons, including supplier challenges, blocked gas lines, and a compromised gas valve. This code means that the limit switch is open. An inducer was replaced, but the problem remains. We start with the simplest problems and then test for more difficult issues. If not, it's the board and if yes, it's the sparker itself. Hi Dan, I have a forced air coleman furnace that only works when the thermostat is turned all the way up and only runs for a few minutes and only blows warm air, any ideas on the reason? Turn heater on but no glow on the ignitor. When the temperature drops a degree and it should go back on and heat, it will click back on--it will click to start, you can hear it trying to go-then it does not light. Maybe a limit? Answer: The thermocouple confirms that the pilot is and stays lit. The cost of remedying the issue could be anywhere from $150 to over $500. Question: I have a Miller Furnace model # M7RL 072A AW. Answer: My initial thought is the blower motor or fan wheel. (Don't laughI've seen it before.) A continuous light means that the IFC circuit board needs replacing while a continuous off means the furnace is either off or not receiving any electrical power. My nest was not getting enough power so I used extra wire to hook common to thermostat. Trying to fix a furnace yourself is great, but experimenting can be dangerous and cause more problems than you already have. One thing I can say is that if the unit was registered, then you should still be under warranty. Question: I have checked the flue from the roof with a garden hose to the crawl space, and it is clear. I do not have these memorized. Read: American Standard Furnace Troubleshooting Guide. Your furnace is functioning normally, and there is a call for heat from your thermostat. Fan constantly runs but nothing else happens. The pressure switch is stuck in the closed position when this code appears on your York furnace. If so, you should be able to pick one up at the local hardware or automotive store. If not, you'll probably need a service tech. When there are funky readings and weird activities that just don't seem to tie together for logical conclusion, the board is a pretty regular suspect. I cleaned the flame sensor and now nothing. It was running earlier but sounded like it was struggling then turned off. What could that be? I think I have a blower that is starting to fail. Lately I haven't heard the furnace kick into the 2nd stage. Hi i have a goodman its flashing red light. YES: Then it's likely your thermostat is bad and needs replacing. I have been on calls where kids playing around the furnace have turned knobs and flipped switches, costing their parents grief and about $150, so be sure the gas is turned on as well. The hum is likely a transformer if it's a rather soft hum, (not a motor stick hum). I turned my furnace on for the first time since winter it worked fine in the winter but now wont turn on. Check the furnace filter and replace it, if it's dirty. There is an issue with the ignitor circuit. Lennox furnace troubleshooting. Solid red led on circuit board, heater Before proceeding with any manipulations, make sure that the furnace is off and that you have turned the gas off at the valve. The igniter glows brightly. There should be a code chart that says if that means "normal operation" or a particular failure. Reconnect the tubing to the pressure switch and the blower. This is what a hot surface igniter looks like when it's working. If that is good, I'd check power to and from the transformer, (120v in 24v out). Any thoughts? My heat isn't working either. Furnace Filter Airflow What You Need To Know? My electric furnace blows hot air for about an hour and then the furnace breaker trips and it starts to blow cold air. Red light is flashing slowly, and Green light is solid = the High limit switch is open. It can deform the components and cause a wide range of serious issues. This can short-circuit the device and is overall not safe (such units can easily shock you). Pull the tubing off the draft blower and follow it to get to the switch. Green LED4 On. Read: Two-Stage Furnace - What Are Pros And Cons? If I manually light (light paper and put in front of the pilot) the burners will light and the furnace will run for 20 minutes and then shut off before reaching the set temperature. This is something that becomes apparent early in the heating season. See if this article can help to see. I checked breaker and nothing. I have checked that the S8610 spark module is sending the proper 24v to the pilot valve, but I'm not sure it is opening the gas flow. Read: Why Does Home Thermostat Say HEAT ON But There Is No Heat? Check the gas pressure. This indicates no power is provided to the gas valve, and a flame is still present. You'll need to call a technician however to find out what's the cause of this. I have replaced it already and it did it again last night. Every brand and unit has it's own coding. We appreciate your help via Internet!! Jesse - The answer to this all depends on your mechanical abilities. Troubleshooting - Help Center - Cricut Then I have to give the fan a hand again, could it be that the fan motor is dirty and just needs cleaning? After it is replaced, it works fine for the rest of the winter, then when we try to use the furnace come the next winter it won't work again. If not, then check the following: NO: Then you may need an electrician or HVAC professional. We have a Coleman electric furnace and it clicks like its turning on but its not actually kicking on to blow airand it smells like something is burning when its trying to click on. I will call for a service technician soon. Question: My Comformaker furnace is showing a four flash code. (I probably shouldnt have to say that, but youd be surprised what Ive seen people do.). For example, a "dotdotpausedotdotpause" would be the number 2, which the chart may say indicates something like "ignition failure" or "pressure switch open.". Your furnace is not able to operate as it cant detect the signal coming from the thermostat. Ray, Sounds likely the pressure switch is either bad or doing it's job because the chimney is blocked or the fan is running too slow to satisfy the pressure switch.