Is it common for the fusible link in my..... - http://www.hvacmechanic.com/ Forums
Original message
| hellbilly
 |  "Is it common for the fusible link in my....."
, posted Mon 19 May 10:29  
Is it common for the fusible link in my trane furnace to go bad? I've already read here on the forum that my "heat exchanger" may be the cause of the failure in the fusible link. But, barring that, because it isn't more than ten years old. Do these "fusible links" just go bad? Any help will be greatly appreciated. Thanks in advance.
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Replies:
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| | hellbilly
| "Re(2):Is it common for the fusible link in my" , posted Mon 19 May 15:21
The led reads normal. Blinks fast or slow depending on whether or not the thermostat is on. The only thing I noticed was that after eleven blinks it has a brief hiccup before continuing to blink. Problem is, that list of things for the light only goes to nine. And for the record there IS a fusible link. Anymore help?
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| | hellbilly
| "Re(4):Is it common for the fusible link in my" , posted Mon 19 May 20:50
Also, I did watch the led following the furnace shut down AND prompt attempt at a restart and still no change. It blinks normally throughout.
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| | hellbilly
| "Check your combustion air connection to unit" , posted Mon 19 May 20:46
"Check your combustion air connection to unit for a leaf."
I really don't know what this means at all. If you can put it in laymens terms, or direct me to a diagram/schematic I can certainly follow directions with the best of them. I appreciate any and all assistence. Thanks again.
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| | hellbilly
| "Re(4):Is it common for the fusible link in my" , posted Mon 19 May 20:42
I don't have a meter but I went ahead and disconnected the fusible link (figuring it shouldn't hurt anything as it is a fuse and becomes "disconnected" for saftey), then turned the furnace back on. At this time I got four blinks on the led, indicating "open high limit device". Which I took to mean, the fusible link is fine, if it wasn't I would get four blinks even with it still plugged in. Is this correct?
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| | hellbilly
| "model number" , posted Mon 19 May 22:00
The model number is - tux100c948c.
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| | hellbilly
| "Re(6):Is it common for the fusible link in my" , posted Mon 19 May 21:55
You tell me what a "jumper" is and I'll do it first thing in the morning. And if it will help move things along I'm sure I could go buy a "tester". I thought I had one, but I must have given to my buddy. Let me know about both. And thanks yet again.
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| | hellbilly
| "Checked both" , posted Tue 20 May 10:19
Their are no obstructions to the intake. And when I jumped the connection on the pressure switch their was no discernible change. Though, if you accidentally ground it, it will throw a little spark and stop the inducer motor from running for a second. You been very helpful illiminating some things, anymore thoughts Duke? I sure can use the help. Thanks.
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| | hellbilly
| "Re(2):Checked both" , posted Wed 21 May 07:17
O.K. I Pushed the "red" button, although it wasn't red. I also tryed wetting my fingers and getting a 24v shock, I got nothing from the wires on the gas valve. And I molested pretty good with quite wet fingers, trying my damndest to get shocked and still nothing. If my gas valve isn't getting juice, does that make you think it's the circuit board? I will go by a tester today if I need one. Let me know. Thanks.
Sorry I didn't get back to you yesterday. I had a minor dog emergency and was at the vet most of the day.
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| | theduke03
| "Re(3):Checked both" , posted Wed 21 May 07:25
Well you either have a bad circuitboard or an open switch somewhere. Run furnace again and check across all switches with voltmeter All should read 0v. Pressure switch will read 0v when inducer is up to speed. Continue to watch for error codes, they may take a few minutes to appear.
"My dad was the most feared furnace fighter in Northern Indiana."
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| | hellbilly
| "Re(4):Checked both" , posted Wed 21 May 07:33
I'll get a voltometer today. And maybe tonight you could help talk me through some testing? I sure would appreciate it. I don't know what this site means to you, but if I actually get this thing fixed myself, there will be a donation in it for the site or you or both. So thanks again for all your help. I really truly appreciate you spending your time helping me out.
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| | hellbilly
| "Done and Done" , posted Wed 21 May 12:11
I went and got a multimeter and tested the volts on the pressure switch and the rollout switch. Both were zero. But while testing (a few minutes later, as you predicted) the blower came on and the led light went into a two blink pattern, indicating "external lockout (retries or recycles exceeded). Which kinda sounds like the furnace has given up trying to light, but still tells me nothing of the actual problem. If their are any other "switches" that I can check I have the meter now. And of course, any other thoughts you (or anyone) may have, I'm all ears. Thanks again Duke, I do believe your Dad was the most feared furnace fighter in northern Indiana.
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| | theduke03
| "Re(1):Done and Done" , posted Wed 21 May 19:11:
Hellbilly, I believe it's the circuitboard. To verify this reset furnace, and check for 24v at gas valve. As long as all safety switches are closed like you say they are, board should send 24v to gas valve once ignitor is glowing. If not, bad board. You may just want to check wire connections to board and make sure nothing is loose or fallen off.
My dad is not really a furnacefighter, I stole that line from A Christmas Story. That's the part when smoke starts pouring out of the vent in the kitchen.
"My dad was the most feared furnace fighter in Northern Indiana."
[this message was edited by theduke03 on Wed 21 May 19:17] |
| | hellbilly
| "Re(2):Checked both" , posted Wed 21 May 07:12
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| | hellbilly
| "Re(8):Is it common for the fusible link in my" , posted Tue 20 May 07:55
I'm on it Duke! Be right back.
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| | hellbilly
| "Re(2):Is it common for the fusible link in my" , posted Mon 19 May 15:21
The led reads normal. Blinks fast or slow depending on whether or not the thermostat is on. The only thing I noticed was that after eleven blinks it has a brief hiccup before continuing to blink. Problem is, that list of things for the light only goes to nine. And for the record there IS a fusible link. Anymore help?
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| hellbilly
| "Thought the full story might be helpful" , posted Mon 19 May 10:59
I noticed that the blower was running constantly. I got it to stop by turning off the main power to the unit. But, after turning the power back on, the burner would no longer ignite. My blower does go on and off by using the on/auto on the thermostat now, but I'm still not getting a flame. Everything seems fine, ignition is glowing bright, exhaust fan humming away, but no gas/flame.
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