5amp fuse blowing

[Jingle Scott]

3 amp fuse in a 5 amp slot?

[Bsmith816]

If I was you I would have done the smart thing... Called a service technician

[jtrammel]

were not allowed to give DIY advise to non pro members. If you are a tech, get your post count up and apply for pro membership. You will get all the help you need then, but until then you will not get any useable advice. What is a "Ducane Tech" a gas furnace is a gas furnace to a tech, they all work pretty much the same.

[pacnw]

how many places do you have to post the same question?

[hvac wiz 79]

Might of ended up saving $ by calling a professional ..

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[Elfshadow]

This thread is an eye opener for me. Working in a factory run testing units, they wont let me just change parts out if fuses are blowing. They ***** at me if I blow a second fuse without finding the problem, let alone just changing boards, blowers and thermostats. Is this how stuff is actually done in the field?

[beenthere]

Merge your 3 threads on this into one.

Please don't make duplicate threads, thank you.

[timjimbob]

I've visit this , in other posts, before.

Start troubleshooting this systematically. Fuse all loads, including Common. Which fuse continues to blow? Then Trace the circuit flow through the bad fuse.

Remember, stat wire runs, without a blue(common) conductor, will not blow fuse but will energize a circuit if it is shorted. Unless it is going to a ground and transformer is also anchored to ground.

6 hours to blow may be overnheated fuse connection. Look for weak, heated fuse connection. This is obvious,Did you use an amp meter?

[2sac]

Wow what great help not really. How about someone who actually knows about this because even ducane tech couldn't figure it out.

and none of us can figure it out either. We can only lead you in the right direction. Check your low voltage conductors and loads individualy. Please remember, You are not entitled to my knowledge nor that of anyone elses on this board. How about being a littless rude.

[Technosponge]

I've been working on a ducane gas furnace and have replace almost every part but the 5 amp fuse keeps blowing every 6 hrs or so. I even changed the thermostat wire the t-stat itself, the control board, the gas valve and even, the blower and it still blows could it be the condensing unit

You have a time line here what sequence of events takes place every 6 hours? Remember the five basics of trouble shooting

1 Talk to the operator

2 Accomplish a visual inspection
(Safety , Safety , safety )

3Attempt to operate the equipment
Important note : If there is a remote chance of possible damage to personnel or equipment SKIP THIS STEP.

4 Voltage checks
check supply voltage first , then control voltage

5 Use the documentation (i.e. ladder drawing) and the appopriate test equipment to logically troubleshoot the circuit and isolate the problem.
If you have replaced all the parts its possible something was rewired incorrectly.

Above all remember be safe if you do not have a good feel for you level of competency. Do get the correct help and learn from the pro.

Good luck

[ControlsInMT]

Wait...pull the fuse before it pops, change furnace. Problem solved!

[Mr Bill]

what does being epa certified have to do with the price of beans in Africa?

Because there the EPA they have to monitor the beans sold there, because they only allow so many farts in one day.

[caheiman30]

Disconnect the wires running to the condensing unit for low voltage and that will tell you it there is a problem at the condensing unit


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