Coleman Evcon Furnace Bgu10020a Manual
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Let's just get the disclaimer out of the way first: many homeowners may lack the tools, the experience and the ability to mess around with their heating system. I certainly understand that and agree: I leave most things to the pros.
On the other hand, if you wake up in a blizzard and find yourself without heat as I did this morning, there are a few things that you might want to try before you give up and call for repair. Even if you can't fix the problem yourself, you may be able to determine at least some information about what is causing the malfunction, and that information can sometimes be very useful to the people who will ultimately come to fix it.
As I said, we had a nasty snowstorm last night. It wasn't a lot of snow, but what came down was wet, heavy and sticky. Of course the wind was howling too; high winds are what defines a storm as a blizzard. At 5:30, I hauled myself out of bed. The power had come on again, so I walked to the living room to turn up the thermostat. We keep the heat dialed way down overnight; it is programmed to turn back up at 6:00 AM, but I was up earlier as noted.
I turned it up and the furnace did kick in. I went to the kitchen and snagged a yogurt from the fridge.
I had barely got to the drawer where we keep the spoons when the electricity went off again. Just a few moments later, it kicked in again and shortly after that I heard the furnace start up. I sat down at my computer and started some work. Perhaps a half hour later, the lights went out again. This time, they stayed out until just before my wife got up—possibly the chirping phone-setup message woke her up this time. We both sat down at our computers after eating a banana and a few nuts. A few hours later, my wife noticed that the house was getting cold.
I got up to look at the thermostat and saw that it should have been calling for heat, but the furnace was not responding. I shut the thermostat off and turned it back on, dialed down the temperature and dialed it back up, but got no response from the furnace. I could hear the relays click in the thermostat, so I suspected it was not the culprit and moved on to look at the furnace itself. The covers on these units are a pain to take off and put back on. I have to do that when I change the filters and it is never fun, so my first attempt at fixing our lack of heat was to open the home circuit breaker cabinet, find the one marked 'Furnace', and shut it off. I counted to ten, turned it back on, and was rewarded with the sound of the furnace kicking in. That's good, I thought, and went back to my work.
Unfortunately, it was not good: after the long air purge cycle, which is designed to blow out any lingering explosive gases that might have found their way into the ducts, the furnace did not fire. Obviously I had a partially working furnace, but it did not want to fire.
Neither furnace manufacturers nor home owners like furnaces that blow up, catch on fire, or leak poisonous gases. That's why the units have various safeguards built in, like the air purge before firing off. Many furnaces today have some sort of diagnostic indicator that can sometimes tell you what is wrong. For my furnace, it's a flashing green light and the cover of the control box helpfully tells you just what these lights mean. The charge that follows is specific to MY furnace. Google your furnace model if you don't find a chart inside the unit. In a previous furnace failure, the light had been blinking three times, which means that the combustion air switch failed to close.
It was a faulty unit. I did not attempt to replace it myself, but I did let the service company know what they'd need to bring. In this case, they had the proper switch on their truck anyway, so it wouldn't have mattered, but of course it could have. In this case, the light was flashing four times. That means a limit switch was stuck open. I called the service company and told them. When he arrived, he showed me how to follow the diagram to find the switches.
If you look closely at the wiring diagram on the cover of the control box, you can see that an 'upper limit switch' and a 'lower limit switch' are referenced. The diagram also shows the colors of the wires that go to these switches. The tech followed the colors and found that the lower switch was a small circular disk that had only the two wires coming into it. When we followed the gray and blue wires for the upper switch, we found something that had a button on it. Buttons like that are usually reset buttons, so he pushed it. I then cycled the furnace circuit breaker again and this time the furnace fired off after its purge.
That was a welcome sound! We let it run a bit, shut it off using the thermostat, waited a bit, and turned the thermostat up. The furnace worked again, so we were both satisfied that the issue was fixed. The next time this happens, of course, I will try resetting that switch before I call for service. While I had heating systems on my mind, I decided to change the batteries in my thermostat.
It's easy to forget about these—they draw very little current, so the batteries can last for years. It's a good idea to replace them more often than that, though. As we use rechargeables, I just change them whenever something makes me think about the thermostat—that's often enough that I shouldn't ever have a problem. Update: Summer 2013 Last winter we had frequent furnace problems. It usually wasn't the high limit switch: in fact, no lights would be flashing. I found that if I turned the thermostat to 'Off' and then back to heat, it would work.
I bought a new thermostat, but that changed nothing. Thinking it might still be that limit switch, I ordered one of those. That switch was backordered, and took so long to arrive that it was now summer.
I decided I'd wait for winter again before replacing the switch, but then we had a spell of very hot weather. We don't usually use our air conditioner, but when the house hit 95 degrees, I turned it on.
But it didn't come on. When I checked outside, the big A/C unit was running, but the furnace fan never came on to blow the air. Fortunately, there is a switch on the thermostat to turn the fan on manually, so that's what I did, and we survived the heat wave. Given that and the problems of the previous winter, I called in a service tech.
He found the problem very quickly: a fuse. No, not a blown fuse, but apparently one that would sometimes arc a bit.
Thank you so much for this! Hubby was out hunting and I awoke to a freezing cold house. First, flipped the breaker off and onjust as you did and heard it cycle and thoughtthat was easy, only to have it go off again!! I ripped the thing apart and saw the green flashes, however, had no idea what to do about it. A google search brought me to you and my heat is now working.
Hoping it is not indicative of a bigger problem, however, we had a power outage yesterday for two hours and I am wondering if that caused the problem. Also, had the lights flashing low battery on my control panel. I replaced those as well. I am keeping my fingers crossedand leaving all the panels and screws off for hubby to deal with when he returns from the woods. Thanks so much, and the pictures were a fabulous help!!!!
Coleman Evcon Furnace
I had the same issue several years ago. Fortunately, it only cost me about $50 to learn about resetting the limit switch. This year, the limit switch started tripping every couple of hours, so I pulled it out, looked at it under a magnifying glass to find the part number, did a search and found a replacement. The exact same part number cost $25 from one store (with shipping) and $95 from another, so it pays to shop around. By the way, if you have a problem with the furnace flame sensor, you can usually clean that with steel wool to remove burnt dust and any oxidation to make it as good as new.
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Coleman Evcon Furnace Manual
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Coleman Evcon Furnace Capacitor
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