5amp fuse blowing

[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


Sent from my iPhone using Tapatalk

[timjimbob]

Weedeater fight with CU control wires.
Happens all the time.
But, only when there is a call for cool.

[beenthere]

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

ROFL.

[welling service]

If I was there I might tell you the problem. You are supposed to be a tech so figure it out. Do you carry a journeyman license? Why did you change the blower motor? Didn't understand your reason. I kinda lost signal. Does this happen in cooling and heating mode?

[Mr Bill]

Why did you change the blower motor? Didn't understand your reason.

I only changed blower because home owner asked.

Maybe this will help with your question.

[2sac]

Maybe this will help with your question.

That a common request with you resi guys? "While you're down there changing the gas valve, would you mind charging me more money and changing out the blower motor?"

[dgussler]

short in condensing unit??? Nahhhh. probably bad TXV in air handler

[philjafo]

That a common request with you resi guys? "While you're down there changing the gas valve, would you mind charging me more money and changing out the blower motor?"

Thats called preventive replacement, if you put a new blower motor in every year its a lot less likely to fail in the middle of the night.

[Joehvac25]

I think I smell a youngwiseman thread here, bump!

[ryan1088]

I think I smell a youngwiseman thread here, bump!

Let the entertainment begin!!!

[SBKold]

I doubt we will ever hear from bmurph again.! Poor guy!

[welling service]

Mr. Bill look at the words extremely load in one of bmurph's post and explain to me what they mean.

[pacnw]

load=loud

[timebuilder]

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

I smell DIY.

[jlanesey]

Oh lord, I had an EPA universal before I walked out the door at my school with 0 field experience.

After a few years of hard work and learning I'm finally where I would like to be in my career.

Good luck pal,

You will need it.