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3 amp fuse blown - why

Unit has short - 3 amp fuse blown that is connected to the filter circuit board. Client stated the blower motor was running slow before unit quit.
How to determine what part is bad?

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It will have to be whatever part is in that circuit, if it's the blower you need to ohm it out and check the bearings and capacitor. if there is a wiring diagram it will help you determine what is in that circuit.

Posted on Mar 17, 2009

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I replaced the blower, and resister on my 2012 chevy. impala but blower still don't work. What fuse do I need to check


The fuse box should be under the hood, passenger side. Try the upper box, middle right side Mine is huge, 30 amp

Sep 23, 2016 | 2012 Chevrolet Chevrolet Impala LT

1 Answer

2000 jeep grand Cherokee limited only blows cold air despite c.c setting position. Also what I'm Guessing to be the blower control module hot lead burned through end of wire/ wiring harness/ and circuit...


lead burned through
that's easy
using the wrong fuse size
and the feed is shorted,
the correct fuse prevents the burned wires.

here are the HVAC pages
http://www.jeep4x4center.com/knowledge-base/index.htm?utm_source=cj#service

lots of things can short. in cars. (topic Hvac)
  • the wires.
  • the connectors
  • the HVAC motors (actuators)
  • the blower.

if you had stated the exact wire color and what it connect to exacty
we can state who shorted.

Fuse 1 , 40amp runs the blower. dark green.
Fuse 20 , 10amps runs others.
Fuse 7 runs zone control,,,10A and all 4 damper motors actuators.
see 8w-42-6 pages.

ok you have your FSM and now can find who connects to what.

Apr 10, 2014 | 1999 Jeep Grand Cherokee Limited

1 Answer

BLOWER FAN WILL NOT RUN ON HIGH SPEED. WHAT TO CHECK??


The relay for the manual blower system is a different relay from the others. It has terminal 87 which is the high amp terminal. It comes through fuse 3 on the relay center, a 30 amp fuse. It it is right hand underhood.

The relay also contacts terminal 87A which is the lower power circuit that gets 25 amp from fuse 5D in the instrument panel fuse block. That supplies the 3 lower speeds and when switched to high applies voltage to the relay switching it from the 25 amp circuit to the 30 amp circuit.

The SAME wiring supplies the blower from the relay on to the blower. The blower uses only one ground which is terminal B on the blower motor. Your motor should have run the same but when you disconnected the terminal socket for both A and B from the blower motor, there was no ground. You do have to supply your own ground!

Easy check is fuse 3 in the relay center. Hope it's blown. Might question why it blew, but that's an easy replacement. I might indicate impending blower motor failure with age and high current loads.

it could indicate the relay is stuck on the 87A contact and not switching under power to the other terminal. Could be primary circuit blown not pulling the relay or could be the contacts are physically burned to the most-used contact.

Jun 06, 2011 | Chevrolet Corvette Cars & Trucks

1 Answer

Furnace blower runs continuously but no heat


sounds like the furnace control (low voltage) circuit is open, or in other words you either have a fuse blown or a limit switch that needs to be reset. Most newer furnaces have a small knife like fuse, usually 3 or 5 amp located directly on the circuit board. Limit switches that have a manual reset are usually located in the fire box just above the burner. There may even be a limit switch located on the blower assembly. If you fuse was blown, you may need to find out what caused the short in the circuit or it will do it again. If the limit switch was tripped, you need to turn the furnace back on and watch the flame to see if there is "roll out". It it continues to trip or blow fuses you need to have the unit serviced.

Apr 10, 2011 | Dayton Gas Furnace Heater

1 Answer

Nothing works at all. It's plugged in and the breaker is fine.


There is usually a 125V, 20 AMP line fuse inside the microwave, mounted at the point where the power cord enters the back of the unit. Unfortunately, you will need to uninstall the oven (if this is an over the range model), UNPLUG it and remove the exterior case to access. The case comes off in various ways depending on manufacture and model. If the model number you listed this question under is correct, you have THREE potential causes for a complete loss of power. 1. Line fuse 2. Line filter/noise filter circuit board 3. Thermal Cut-Out (Thermostat) for the Magnetron. The line fuse is connected in line with the power cord inside the unit and is listed as part of item 11 under the "Blower-Motor" parts heading. The line filter printed circuitboard is listed as item 19 (part number: R9800472) under the "Blower-Motor" heading. The Thermostat for the Magnetron is listed as item 8 (W10254040) under the "Cavity" parts heading. The most expensive part is the line filter board, which runs about $25.

I would recommend you check the fuse, first. This the easiest and least expensive repair. It is also the most common. If you managed to overheat the oven any time recently, you may want to check the thermostat to see if it is still good, next. It should read 0 ohms when measured out of the circuit across the terminals.

If the line fuse is blown, you can usually purchase a box of fuses at a hardware store for just a little more than what the manufacturer charges for a single fuse. 125V, 20AMP Ceramic Slow Blow fuses are recommended.

If you have any questions, or need additional assistance troubleshooting, please post back and let me know. I hope you find this information helpful.

NOTE: Make sure you take any resistance readings with the microwave UNPLUGGED and the component under test isolated (removed) from the circuit. These ovens can blow a fuse by simply sitting idle. This can occur from any power fluctuations, brown outs, voltage spikes, etc. Or, it could be the symptom of a component that may have failed. If you find the internal fuse blown and replace it, only to have it blow again, you have a more significant problem than a simple blown fuse.

Jul 01, 2010 | Amana AMV5206 Microwave Oven

2 Answers

Hotpoint ultima cd80 condenser dryer has stopped heating can it be repaired/reset or is it a new unit and how much? Cheers


Hi

Thanks for using FixYa. If your dryer isn't working or isn't getting heated up, you'll need to check the following to be sure what exactly the issue is--
Blows fuses or trips circuit breaker —ELECTRIC Models:
• The amperage readings are at 240 volts. One line will be 24 amps and the other line will be 21 amps. The neutral line will be at 3 amps. If the above amperages are not present, then the house wiring, fuse box or circuit breaker should be suspect.
• Shorted heating element to housing.
• Incorrect wiring or a wire shorting to ground.
• Drive motor winding shorting to ground.

Blows fuses or trips circuit breaker —GAS Models:
• If igniter is not glowing, check for 120 V at igniter.
• Igniter harness may be loose and shorted to base.
• Incorrect wiring or a wire shorted to ground.
• Drive motor winding shorting to ground.


If it runs for a few minutes and then stops, then check for the following:--
• Empty dryer.
• Check motor spins freely.
• Lint buildup around drive motor.
• Low voltage present.
• Blower impeller blocked in blower housing.
• Drive motor - start switch contacts stuck closed.


Please do rate the solution and revert for further assistance.


Thanks

Rylee

Nov 10, 2009 | Hotpoint Dryers

2 Answers

Ge dryer just stop working is there a circuit breaker in the dryer


basic problems]
First check these:-
1) Over load cut off (try running it empty)
2) circute failur and fuse blown

Sep 20, 2009 | GE DBSR453EBWW Electric Dryer

1 Answer

Fujitsu asu18c1 mini split ah


change the fuse donot operate the unit and change the thyristor

Feb 23, 2009 | Fujitsu 18C1 Air Conditioner

2 Answers

Keeps blowing the fuse.


In more rare scenarios the 24v activated fan relay that is soldered to the circuit board can cause this same problem. I agree with Therinnaiguy, If the fuse is blown 90+% of the time there is a short in the 24 volt control system.

Jun 09, 2008 | Goodman GMS90703BXA Heater

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