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Did you kill the new thermostat? Reinstall the old one.
Or just leave the engine running until it runs out of gas. |
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My buddy did the same thing. So he called me. I'm NOT an HVAC tech, but I've wired a few dozen.
Go to your furnace, remove the cover and if you can read the schematic look for a fuse. you will more then likely find a blown one. replace. fixed. or you wired it wrong and are screwed. my vote is on the fuse. |
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Does the new one take batteries? I did the same thing when installing mine and I caused no harm.
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Look for a reset button on the furnace... If I get a power surge mine will trip and it won't run till I reset it
Falcon |
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There is a fuse near the furnace, usually an old twist in type. Look at that first.
Second, put the old thermostat back on, see if it functions. If it doesn't (or you don't get heat) have another person stand at the thermostat and turn the heat off while you stand in front of the furnace (take the cover off first). Watch the startup sequence and note any flashing lights on the board (this will be a long short long type code for an error). Often there are manuals (and should contain error codes and startup sequences so you can spot the problem). But, check the fuse first. Yeah, unfortunately you may have blown the logic board. Those are not cheap, and probably will require installation by a HVAC professional. |
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I must add this.
We didn't have a fuse that was even close, you'd be amazed that a paperclip can work overnight until you get to a store. Just sayin'... (the small spark gave it away. Fuse.) |
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Not a breaker––the thermostat is low voltage.
Got a multimeter? Test for current between the thermostat wires. I'd bet in your furnace as well, but I'm not HVAC or an electrician. |
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Quoted:
My buddy did the same thing. So he called me. I'm NOT an HVAC tech, but I've wired a few dozen. Go to your furnace, remove the cover and if you can read the schematic look for a fuse. you will more then likely find a blown one. replace. fixed. or you wired it wrong and are screwed. my vote is on the fuse. Quoted:
Look for a reset button on the furnace... If I get a power surge mine will trip and it won't run till I reset it Falcon I've already had the cover off the furnace, looked around and read the instructions - but didn't see a reset button or a fuze. I'm a little wary of accidentally screwing something up and letting gas leak into my house and blowing it up! But I'll go look again, specifically looking for fuses or reset buttons. The furnace is a Carrier, btw - if that makes a difference. BRB |
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You might want to finish connecting the wires before you fix the fuse too
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Space heaters FTW, dude! Lowe's has some nice ones. The ones that look like radiators and heat oil inside them are the most efficient.
At least they'll get you through your visit until you can get an HVAC man out. Just explain the circumstances honestly and that's all you can do. Your guest should appreciate the efforts you were making to improve their comfort when disaster struck. Also, ALWAYS shut power off at the master breaker before fooling around with ANY kind of an installation like that! |
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You fried the the fuse or the bus where the thermostat wires connect to inside the boiler or furnace cpu. Do your other t-stats work?
Oh yeah, next time kill the breaker. Post pics of the cpu so someone can find a schematic and possibly a fuse spec for you. |
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Take a picture of the furnace, maybe one of these guys could point out the fuse
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I'm the first one to call dibs if you can't fix the fuse and your wife come home to a cold house?
At least I didn't make the first goose joke! |
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Quoted:
My buddy did the same thing. So he called me. I'm NOT an HVAC tech, but I've wired a few dozen. Go to your furnace, remove the cover and if you can read the schematic look for a fuse. you will more then likely find a blown one. replace. fixed. or you wired it wrong and are screwed. my vote is on the fuse. If i was him i would pray for this. |
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Quoted:
There is a fuse near the furnace, usually an old twist in type. Look at that first. Second, put the old thermostat back on, see if it functions. If it doesn't (or you don't get heat) have another person stand at the thermostat and turn the heat off while you stand in front of the furnace (take the cover off first). Watch the startup sequence and note any flashing lights on the board (this will be a long short long type code for an error). Often there are manuals (and should contain error codes and startup sequences so you can spot the problem). But, check the fuse first. Yeah, unfortunately you may have blown the logic board. Those are not cheap, and probably will require installation by a HVAC professional. Agree on this,if there is no fuse |
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Can you tell us make and model of the furnace so we can figure out what type of controls or main board it has and if there is an internal fuse or not.Also if you open the main panel on the furnace ther may be a schematic with some basic troubleshooting info.
ETA nevermind I see that was done while I was posting. hopefully 11b is not built into the casing of the transformer. Should be easy enough to check the output with a voltmeter though. see the box on the other side of the schematic from the fuse 11b there is a fused output just past the "aux junction box" with a optional fused switch which looks like your thermostat inputs would wire into it. check the output of the transformer and its fuse (24VAC) and if thats good I would look at that fused switch area for another fuse possibly inside the junction box. |
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Does the thermostat have batteries in it? how many wires connect your thermostat to the furnace? if it's 2 a milli-volt system. all the thermostat does is close a switch between the 2 wires, signaling the furnace to start. IF IT IS A MILLIVOLT SYSTEM connecting the 2 wires together at the thermostat will tell your furnace to start. if it doesn't, then the problem is not the thermostat. my bet would be a reset on the furnace itself.
disregard if it's not a millivolt thermostat. |
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Just go back -and figured out what the blinking light on the board meant - it indicated an error which is "secondary fuse open" - referring to a 24V circuit.
So y'all are 100% correct that it's a fuse. I'm going to run down and take a picture so hopefulyl someone can help me figure out where the hell the fuse is??? BRB |
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These things run on 24 volts. You most likely damaged your control circuit. Call a HVAC serviceman.
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You've got a fuse hidden someplace. It took me about 20 minutes to find the one for my furnace. I replaced it and immediately popped the damn thing again. So when I went back for the second fuse, it's a screw in type, I spend the extra 7 bucks and got the kind that's actually a breaker and not a fuse.
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Ok, ive been working furnaces for 10 years now. If this is a newer type furnace (10 - 12 years old, thereabouts)
You probably blew the low voltage fuse. It is exactly an automotive type fuse. It is located on the circuit board, most likely in the lower section of the furnace, probably in front of the blower. They put it down there to keep the circuit board cool. If you cant find it or that doesnt seem the problem -IM me, and I can probably help. |
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As I've read somewhere on here before... Pics or GTFO!
Still betting on the fuse. What type of Carrier? Model #? |
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Tell her it's the hope and change Obama promised her, it just feels like cold air
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REMEMBER TO CAP YOUR T-STAT WIRES OR INSTALL TEH NEW T-STAT BEFORE YOU PUT THE NEW FUSE IN AND TURN THE BREAKER BACK ON.
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I can see DK frantically running back and forth from the furnace to the computer.
It should be hilarious when the missus drives up and he has shit tore all to hell, he is covered in the gunk that is always inside the covers of a furnace and he looks at her and says "What?" |
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Quoted:
I can see DK frantically running back and forth from the furnace to the computer. It should be hilarious when the missus drives up and he has shit tore all to hell, he is covered in the gunk that is always inside the covers of a furnace and he looks at her and says "What?" Yeah - the furnace is in the basement, and my computer is on the second floor, so I'm furiously running up and down the stairs!! |
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Ahhhh... newer style fuse.
Pull it out and see if the wire is blown out on the inside of the fuse. you'll know it when you see it. |
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Quoted:
I can see DK frantically running back and forth from the furnace to the computer. It should be hilarious when the missus drives up and he has shit tore all to hell, he is covered in the gunk that is always inside the covers of a furnace and he looks at her and says "What?" Yeah then we help him fix it and he gets pie for being a handyman and not having to call service. |
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Shine a light on that purple fuse, after you dusted it, and you should be able to see if it's blowed.
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Yes, that's probably the culprit.
Its a 3A auto fuse. Finish hooking up the new T-stat first, then change the fuse. From the manual: The 24-v circuit contains an automotive-type, 3-amp fuse located
on the main control board. Any 24-v shorts during installation, service, or maintenance could cause this fuse to blow. If fuse replacement is required, use ONLY a 3-amp fuse of identical size. Pg. 8 http://www.xpedio.carrier.com/idc/groups/public/documents/techlit/58wav-9si.pdf ETA: "Borrow" one from your car if you have a 3 amper and it will fit. |
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There is some useful info in this thread, and I think the experts are circling in on the solution, so permit me this brief digression/comment:
Dude, you're supposed to fry bacon, not thermostats. |
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Quoted:
Ahhhh... newer style fuse. Pull it out and see if the wire is blown out on the inside of the fuse. you'll know it when you see it. YES!!! There's a scorch mark, and the two wires are clearly separated! ETA: CRAAAAAAAAAP - while I was typing my wife just called and they're on their way back from Regan National already. I asked them to pick up Thai food on the way to delay them!! |
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Quoted:
blown fuse. http://i295.photobucket.com/albums/mm155/uniqe1_photo/electronics_fuse_blown.jpg That's a blowed one alright! |
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sounds like you took out your low voltage transformer, there may be an inline fuse if your lucky. Get a multimeter and ohm out the tranformer. If you have an open winding, get the numbers off of it and pick up new one at Grainger for about $15.(HVAC guy price=$125+
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You can take one out of your car. or....
anything to get by for the night. |
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