How to Fix a Furnace 3/5 AMP Fuse that Keeps Blowing In 2022

How to Fix a Furnace 3/5 AMP Fuse that Keeps Blowing In 2022

When your furnace starts blowing a 3/5 AMP fuse, it can be a sign that there is something wrong with the system. In this blog post, we will walk you through the steps of how to fix a furnace 3/5 AMP fuse that keeps blowing. We will also provide some tips on how to prevent this from happening in the future. Keep reading for more information! 

The trick is knowing what to do and how to do it. That’s where this post comes in. In this article, you’ll find that furnace is an important part of your home, and it needs to be working properly to keep your house warm. 

That’s happened to many homeowners, and it can be quite a hassle to replace the fuse and then wait for your furnace to work again. That’s where we come in. Our experts will diagnose the problem, and they’ll also show you how to fix the problem with minimal effort.

How Do I Fix a Blowing Furnace Fuse?

Too much strain on the circuit, incorrect fuse size, or loose wiring are some of the reasons a furnace’s fuse can keep blowing. There are many problems faced by people, one of which is the problem of the fuse blowing out in the furnace.

If you are facing the same issue, read on to understand why. It’s a sign of a serious underlying issue if the fuse blows out too frequently. This needs to be resolved as soon as possible to prevent a fire hazard. Below is a list of the common reasons for the fuse blowing out.

Overloading The System

The furnace’s fuse could blow out if it’s strained too much through an overload of power or current.

Fuse Size Not Correct

If you use a fuse that is smaller than what is required for the furnace it could cause it to blow. It is important to use the correct size fuses.

Loose Wires

If any of the sites in the circuit have loose contact it can cause the circuit to malfunction. This can cause the fuse to be blown more than once. The sites need to be fixed to address the problem.

How Can I Tell If My Furnace Fuse Is Blown?

Furnace 3/5 AMP Fuse that Keeps Blowing

How do you tell if the furnace’s fuse is blown or not? It’s important that you can identify the fuse correctly. It can sometimes be difficult to identify the fuse in the furnace.

The furnace fuse is a critical safety device inside the furnace. It’s a piece of metal that, when melted, will blow the furnace apart. Before the furnace blows apart, take it out and examine it to find the fuse. Once identified, pull it out gently.

A wire that is damaged can cause the fuse to blow. You can test a blown fuse with a multimeter. Write down the reading of the resistance. The resistor will work best if it is between 5 and 0 ohms.

Is My Furnace Tripping The Circuit Breaker?

A furnace tripling the breaker can be caused by an overload to the circuit.

The best way to prevent this type of event from happening again is to get a thorough inspection of all of your furnace’s components. This will help ensure that it doesn’t happen again.

If the circuit breaker keeps tripping, there could be many possible causes. You need to narrow your focus to find the root cause. The problem with a furnace is that its supply can only take so much. 

It will fail if the electricity flowing through it is more than it can handle, and this could happen if the amount of current in the circuit exceeds the maximum rating of the breaker.

The circuit breaker can trip if there is an overload on the circuit. If the circuit has a furnace as well as some other heavy appliances connected to it, the circuit can get overloaded. If you want to solve this problem, you need to call in an electrician to set up a new circuit and split up the appliances.

Tips On How To Safely Handle Fuses

So, if you are using a furnace at home, what precautions should you take when handling the wire? To ensure protection for you, the furnace, and the surrounding environments, here are some important safety tips to be followed.

Safety Precautions

Call in a certified electrician if you need to perform any electrical work. If you are not familiar with wiring or circuitry, do not attempt to do it on your own. It is possible that it could lead to dangerous situations.

Electrical Shock

The circuitry should be turned off if there is a blowout.

Identical Fuse

Make sure that the new one is the same as the old one when you replace it after removing a blown fuse. When buying a new fuse, make sure it is made of the same material and has the same power and thickness as the origin alone.

Metal Objects

Bringing metal objects close to the circuit is not recommended. You may experience an electric shock if you come in contact with a live wire because metals are good conductors of electricity.

How To Prevent A Fuse From Tripping

Fix a Furnace 3/5 AMP Fuse that Keeps Blowing

It is usually a fault with the furnace or the circuitry that causes a fuse to trip frequently. It is important to inspect the wiring to identify the underlying cause of the issue.

Check the wiring to make sure it’s working. One of the wires could be damaged, most of the time. There is a chance that this could lead to overcurrent in the circuit. If the wiring is damaged, check it thoroughly and replace it.

There is a chance that this could prevent the circuit from tripping. A metal object such as a nail can get caught in the wires and cause the fuse to trip. There is a check to make sure the circuit is working correctly. There is a chance that the fuse might trip if a heavy current is passing through the wires.

The voltages and currents should remain within the normal limits of the circuitry. If multiple components are connected to the same circuit, make sure they are separate. If you have a television, fridge, and furnace, it would be a good idea to connect them to separate circuits so that they don’t overload.

A Guide To Replacing A Blown Fuse In A Furnace

You will need to replace the blown fuse now that you know how to identify it. If your fuse is blown due to any of the above conditions, you will have to buy a new one and replace it. It’s very easy to replace a fuse wire in a furnace.

The electrical circuit needs to be switched off. It’s a good idea to turn the power supply off. This must be done as it can lead to electrical shocks. The circuit breakers should be turned off. It can help prevent electricity from passing through the circuit.

An ammeter can be used to check the amperage. This is done to make sure that there is no current passing through the furnace. You have to identify the blown fuse to remove it. 

A blackened look is what this fuse will have. The new wire should be the same type and length as the old one. It’s important to make sure that it’s the same as the old wire. Make sure that the ends of the new fuse wire are connected firmly by replacing it in the exact slot.

The Fuse On The Furnace Control Board Keeps Blowing

If the control board connected to your furnace keeps blowing out, you should have the thermostat wires inspected for damage. The wires that connect to your thermostat are the ones that cause this malfunction. 

It is a good idea to check those wires for any damage. If wires are passing outside the house or exposed to sunlight, make sure to check these sites. Exposure to sunlight can cause wear and tear on wires, which is why these are the most vulnerable. 

You should check the sites of your outdoor unit and any other wires that are connected to the furnace. Overloading in the circuit will be caused by damaged wires. There is a chance that this will cause the fuse to blow out. This problem could be prevented if the damaged wires were replaced immediately.

Circuit Board 3A Fuse Keeps Blowing

A faulty transformer or damaged thermostat wiring can cause the 3 A fuse on a furnace circuit board to blow. If the inducer on the furnace circuit board is faulty it can cause the fuse to blow. Take a look at the transformer for any problems.

The transformer could also blow out if it’s broken. Replacing the transformer can help with the issue. Use the ammeter to check the readings. The issue with the readings is the overload of the circuit. An electrician can change the circuit. Make sure the furnace thermostat wires are not broken. In most cases, the wires are the culprit.

Circuit Board 5A Fuse Keeps Blowing

A faulty compressor unit or damaged wiring can cause the 5A fuse on the furnace circuit board to keep blowing. It’s a good idea to check for damage to the cables. Outside of your house, the thermostat cables are usually running. If there is any wire that has shorted out, you should check it out.

If there is any damage to the compressor unit, it needs to be checked. There is a chance that the compressor unit could cause a blow-up. The consensus unit’s wiring needs to be checked between the air handler and the unit. 

This wire could cause problems if it has a low voltage capacity. It is possible to check the voltage at each point using a voltmeter. Make sure that the voltages are within the specified ranges.

FAQs: How To Fix A Furnace 3/5 AMP Fuse That Keeps Blowing

Why Does My Furnace Keep Blowing 3 AMP Fuses?

A faulty transformer or damaged thermostat wiring can cause the 3 A fuse on the furnace circuit board to keep blowing. Every furnace circuit board has an inducer and if it is faulty it can cause a fuse to blow continuously. If the transformer is damaged, it could cause the fuse to blow out.

Why Does My AMP Keep Popping?

A constant supply of voltage runs through your amplifier when it is turned on. The pop noise is caused by the surge of the voltages when connected or disconnected from the high voltage half of the power supply.

What Household Items Use A 5 AMP Fuse?

You should use 5 AMP wires for a lighting circuit, 15 AMP for an immersion heater circuit, and 30 AMP wires for a ring main or cooker circuit if this is the case in your house.

What Uses A 5 AMP Fuse?

5 AMP sockets are used on the lighting circuit, which means they are switched on and off with the light switches in the room, rather than being used like regular plug sockets. Floor lamps, table lamps, and fans are examples of appliances that are designed to take less than a 5 AMP current.


I hope you liked this post about how to fix a furnace 3/5 AMP fuse that keeps blowing. If you are facing the same problem, then you need to contact a furnace repair company. 

They will come to your house and fix your furnace. So, if you are having problems fixing a furnace fuse, then you can call the best furnace repair company in your area.

Also Read:
Why Does My Refrigerator Keep Tripping The GFCI? Simple Guide 2022
Why Does My Refrigerator Keep Tripping The Circuit Breaker?

Reggie Burton is a technology expert with over nine years of experience in the field. He has worked extensively with both large and small businesses to help them optimize their tech infrastructure and improve their overall efficiency. Reggie is known for his calm demeanor and his ability to quickly assess a situation and find a solution. He is an invaluable member of any team, and his clients are some of the most satisfied in the business.

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