What might cause my dryer to trip the breaker labeled AC?


I've checked all the main components except the motor for continuity and they all check out fine.

The AC breaker gets tripped and when flipped back on the dryer works. Dryer breaker has not tripped.

All parts are original except heating element, which is maybe 3-5 years old.

Dries fine when running and will finish the whole cycle. It will only run that one cylce, though, and as far as I know it trips the breaker when the load finishes.

Update 2016-02-12: The breaker labeled dryer is definitely the breaker controlling power to the dryer. Turning it off stops power to the dryer. I'm not sure which part is connected to the AC breaker.

It's too cold right now to turn on the AC so I haven't tested whether it will go off when the AC breaker is off.

I've investigated more and found that the door switch is broken, so it is not always engaged. Could the switch being momentarily engaged and then disengaged cause the...

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As you read the answers given, be aware that some of the people answering questions my not be in the same country as you, some countries specify dedicated circuits for some things, and in other countries they allow higher amperage circuits with multiple loads with fuses at the point of use.

In the States the NEC specifies dryers to be on a dedicated 30 amp circuit. If you are in the states and you have a 20 amp breaker you need to call an electrician to see if you have 30 amp wire so you can use a breaker that is big enough for the dryer. Also if you multiple loads on the dryer circuit that also needs to be fixed.

I would also check for a loose connection in the outlet, breaker or pigtail.

Low voltage from the utility could cause tripping but this is unlikely since most of the load is the heating elements, not the motor.

If the house was new it is unlikely that a breaker has worn out in only 3 years, but it is possible it was defective from the beginning. Also...

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what would cause a circuit breaker to trip?

... Why Does the Circuit Breaker Trip While Operating Certain ... An overloaded circuit can cause the circuit breaker to Kiln Pointers. Everything works fine when the weather is dry. circuit breaker synonyms, circuit breaker pronunciation, circuit breaker translation, English dictionary definition of circuit breaker. When I went down to the circuit breaker and noticed the ... What would cause just one breaker to trip? Circuit overloads on a clothes dryer can be ... which will cause the motor ... A heating element that has failed and gone to ground will also trip a circuit breaker. Posted 12-18-15 in Heating. Circuit breaker keeps tripping: ... One very common cause for breakers to trip is loose electrical connections. 3. Reasons Why Circuit Breakers Trip. Does your furnace trip the circuit breaker when it turns on? ... What is causing my circuit breaker to trip instantly and trip the next breaker ... Can a laptop cause an AFCI to...

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I recently solved (sort of?) an issue regarding my washer & dryer not getting power. I consider that issue solved, but now I have a new one, possibly what caused the problem before. Now that I have power to my washer & dryer, I did a small test load. Washer did fine, but the dryer tripped the main breaker outside (100A), but none inside. This didn't even happen when I started the dryer, but after 1-3 minutes (closer to 1 I think) it would trip. I have tested that 4 times now and when I have the dryer off, nothing trips - but a couple minutes after starting the dryer, the whole house goes down.

The breaker panel shows no tripped breakers (all firmly on the ON side - I have turned them all off/on just in case as well). The inside main breaker is fine too. The outside breaker however is clearly tripped. I clear it and turn it back on and everything is fine. Both inside and outside are 100A. Dryer is a 2-pole 30A breaker, which I just replaced today after noticing this new...

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So you’ve determined that your AC is tripping the breaker, but you’re clueless as to why.


Well, an air conditioner usually trips the breaker because it’s pulling in more amps than the breaker is rated for. That is, if you have a 20-amp breaker and the AC pulls 30 amps, the breaker trips.

That’s why breakers trip: to protect you from overcurrents that can damage equipment and cause fires (yikes).

So DON’T keep resetting the breaker and letting it trip. Constant tripping can harm equipment and cause a fire. Find the cause of the problem first.

Common causes of an air conditioner tripping the breaker include:

Dirty air filter Dirty outside unit Issue with the circuit breaker Motor has shorted Compressor has trouble starting Compressor is grounded

You can fix the first problem yourself, but everything else requires an AC repair technician.

Read on to learn why these problems cause an AC to trip the breaker.

Or you...

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How to determine and correct problems which cause breakers to trip.

Most of the time a, circuit breaker trips people simple go to their electrical panel find the offending breaker and reset it. But what happens when the breaker does not reset, or trips often, you can troubleshoot the problem yourself and depending on the problem, repair it or hire an electrician to do the repair for you. Circuit breakers are designed to trip, unlike older fuses in a fuse box that are designed to melt a thin metal strip, and turn off power whenever the following potentially dangerous situations occur:

• Overloaded Circuit

• Short Circuit

• Ground Fault

Types of Breakers

There are three types of residential circuit breakers; magnetic circuit breaker, thermal circuit breaker, and thermal magnetic circuit breaker.

Magnetic circuit breakers are equipped with an electromagnet that gets increasingly strong as the flow of electricity increases. The magnet...

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You woke up early because of a very important meeting. You were getting ready and started to blow dry your hair when suddenly your breaker trips. This is not the first time it’s happened and it is getting to be annoying-especially now that you cannot afford to be late. Sound familiar?

When a circuit breaker trips, it switches off the electrical flow to prevent and protect the circuit from causing damage or the possibility of an electrical fire caused by overheating. If this is repeatedly happening, plug your appliance into another outlet until to find out what initiates the tripping.

Reasons other than your hair dryer that might be causing your circuit breaker to trip

Circuit Overload or Overloaded Circuit means there are plenty of heavy-powered appliances or devices running on the same circuit at the same time. This is the most common cause of breaker trip. Heavy-powered appliances include air conditioner, refrigerator, television set, hair dryer or any device...
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Going outside to mess with your tripped circuit breaker over and over gets annoying after awhile.

A circuit breaker “trips” or shuts off the electrical flow to protect the circuit from overheating and causing damage--even possibly an electrical fire.

So, before you go and flip the switch on again, take a moment to determine what the root cause is of the tripping.

The three typical causes are:

Overloaded Circuit Short Circuit Ground Fault

Circuit Overload

The circuit overloading is the most common reason your circuit breaker is tripping.

That means you’re running too many heavy power consuming devices at the same time on the same circuit.

For example, if you have a 15 amp circuit with 20 amps worth of electricity running through that same circuit because your hair dryer, TV and air conditioner were all on at the same time, then the circuit breaker will trip to prevent overheating.

There are two solutions:

Redistribute the...
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As electricity flows through the wiring in your house, circuit breakers serve as critical safety devices that prevent overloads. When too many amps of electricity are pulled into a circuit, both damage and danger result. Wiring can overheat and melt insulation, causing a fire.

A circuit breaker is a more modern, reusable version of a fuse. The breaker constantly monitors the flow of electricity into a circuit, and if for any reason the amperage exceeds the circuit’s rated amount, the breaker trips and the flow of electricity is interrupted at the breaker panel. All outlets on that individual circuit and all devices plugged into it are instantly powerless.

How Much Load Is Too Much?

In a typical residence, circuits in living spaces like bedrooms and family rooms are generally rated for 15 amps. Parts of the home where more amperage is used such as the kitchen or laundry room will be controlled by more heavy-duty circuit breakers rated for 20 amps. Certain...

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Don't panic if one or both of your clothes dryer's circuit breakers trip. There are several reasons why a breaker might activate, and most aren't cause for concern. When a circuit breaker trips, electricity is cut to the dryer's component it serves u

Don't panic if one or both of your clothes dryer's circuit breakers trip. There are several reasons why a breaker might activate, and most aren't cause for concern. When a circuit breaker trips, electricity is cut to the dryer's component it serves until the breaker is manually reset at the box. If you reset the breaker only to have it trip again, it is best to have your dryer, and possibly your home's electrical wiring, evaluated by a professional.

Circuit Breakers

A dryer requires about 220 volts of electricity, supplied by two 110-volt lines. Each line is protected by a circuit breaker. One line powers the heating element, while the other energises the drum. If a component related to the...

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The circuit breakers found in your service panel are designed to protect property and equipment against short circuits and constant current overloads. Short circuits happen when a hot wire comes into contact with a grounded conductor or surface. Circuit overloads on a clothes dryer can be caused by a current draw that is higher than normal. A circuit breaker also can be tripped as a result of bad bearings, a defective start switch or bad motor windings.

Bad Start Switch, Motor Winding or Shorted Heating Element

A start switch stuck in the "Run" position will cause the start winding from being connected when the motor starts, which will cause the motor to draw an exceptional high current for a prolonged period of time, causing the breaker to trip open. An open circuit in either the start or run windings will result in a high current draw and a tripped breaker. A heating element that has failed and gone to ground will also trip a circuit breaker.


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We hear Phoenix-area homeowners ask, “Why does my air conditioner keep tripping the breaker at the control panel?”

First off, if this keeps happening then don’t turn the circuit back on.

The circuit breaker’s job is to keep your home and appliances safe by shutting off the flow of electricity when the current flow gets too high. If it keeps tripping, something needs to be fixed.

Reasons your A/C trips the circuit breaker

If the air conditioner is the source of the tripping, it may be overheating. When an air conditioner overheats, it draws more amps (a measurement of electrical current) from the circuit.

That may be pushing the circuit past the number of amps it was meant to handle. So the breaker usually trips after the air conditioner has been running for awhile.

So now we need to know what’s causing your air conditioner to overheat.

Common causes include:

1) Dirty air filter: Dirt on the filter impedes air flow. This...

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Why is my Circuit Breaker Box Humming?

A loud buzzing or humming sound coming from a circuit breaker should raise a red flag and requires inspection. Some likely causes of loud humming noises in the breaker box are:

A breaker that is carrying a significant load but is failing to “trip” or shut off may make a loud sound and should be repaired or replaced in order to prevent an overheated circuit.

Sparking or a fizzling may be the result of a connection problem. If this is the case then the wire needs to be tightened or the entire circuit breaker could need replaced.

A circuit breaker that makes a humming noise as soon as it is turned on then quickly shuts off is typically the result of a circuit problem. Circuit breaker problems like this stem from the electrical circuit itself, so the circuit breaker may not have to be replaced. The individual circuit might just need to be repaired.

Anything unusual like a loud noise, mysterious humming in...

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It is over fused if a breaker larger than the manufacturer's label calls for is installed.

Here is a good explanation I picked up somewhere:

A/C condensers contain a hermetically sealed compressor motor as well as a fan to circulate air across the coils. The rules for protection to motor circuits are different than for circuits with simple resistive loads. When a motor first starts , it draws a much higher amount of current than it does after it is running. The high "inrush" current can exceed the rating of a breaker or fuse sized to protect the wire. The inrush current lasts typically only about 6 electrical cycles, or 1/10th of a second - less time than it would take to damage the wire or its insulation. However, if the overcurrent device is sized to protect the wire against overloads, the device might trip, and the machine would not be able to start.

Motor circuits get around this problem by dividing the two separate functions of an overcurrent...

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A residual-current device (RCD), similar to a Residual Current Circuit Breaker (RCCB), is an electrical wiring device that disconnects a circuit whenever it detects that the electric current is not balanced between the energized conductor and the return neutral conductor. Such an imbalance is sometimes caused by current leakage through the body of a person who is grounded and accidentally touching the energized part of the circuit. A lethal shock can result from these conditions. RCDs are designed to disconnect quickly enough to mitigate the harm caused by such shocks although they are not intended to provide protection against overload or short-circuit conditions.

In the United States and Canada, a residual current device is also known as a ground fault circuit interrupter (GFCI), ground fault interrupter (GFI) or an appliance leakage current interrupter (ALCI). In Australia they are sometimes known as “safety switches” or simply “RCD” and in the United Kingdom they can be...

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d80, d90, or d95 Error Code

The , , , and error codes indicate that the dryer's exhaust duct is clogged 75%, 80%, 90%, or 95% respectively.

The hot, humid air from the dryer has to go somewhere, or else the moisture will stay in the drum and clothes. 2 or 4 four bars on the flowsense indicates that the exhaust system is severely restricted.

NOTE: On gas dryers, D80 may indicate the lack of gas supplied to unit.

Check for lint buildup at the rear exhaust duct, the lint build up will cause a long time drying in the dryer.

If you need the service of a professional technician, contact a local vent cleaning company to clean the vent.

A crushed or damaged exhaust will also cause air blockage. If possible, check every section of your exhaust duct to ensure it is not crushed, kinked or damaged.

Avoid long runs or runs with multiple elbows or bends.

Excess or crushed transition duct.

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