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The two items in a dryer that draws the most amperage is the motor and the heater element. Since the heat element normally either opens or is okay, it is doubtful that is the problem. Unless one of the insulators is damaged and shorting to the base.
But before you start replacing things, suggest you use a clamp on amp meter and see if the dryer is drawing more current than what the breaker is rated at. If it is then the dryer has the problem, if it isn't the problem is in the circuit breaker box.
This problem might be in your house electrical system rather than the dryer but it will take some troubleshooting to figure it out. 1. First make sure that you are connected to a 30 amp circuit breaker. If not then that is the problem! 2. Use a clamp on amp meter to see what the dryer is drawing from your electrical panel before it trips. If it is below the rating of the 30 amp circuit breaker when it trips, then your circuit breaker is defective. 3. If the dryer is drawing more than 30 amps it is in your machine and you will need to troubshoot that. Since you stated the times - is it always the same and does not vary? Then you have to figure out what you dryer is doing at the 8 minute mark and each machine is a little different. Soem machines go into a tumble air only mode for the first few minutes before kicking on the heating elecment. If yours is that was then it is the heating element, thermostat or something to do with the heating circuit.
Assuming that your house is wired correctly, if the plug will physically fit into the outlet, then the outlet is capable of driving the appliance properly. A breaker for a dryer should be rated at 30 amperes. The breaker itself could be going bad (they tend to fail to the off position).
Your best bet is to actually use an amp meter to measure the current it draws.
If you discover that someone wired your dryer with a 2 pole 20 amp breaker, then make sure the wire itself is 10 AWG before replacing it with a 2 pole 30.
The circuit breaker may be tripping because of a fault with the dryer or it may be a fault with the circuit breaker being weak.
From the description you give the circuit breakers trip frequently.
I'd suggest you first try selecting the no heat air fluff cycle and run it to see if the breaker trips. If the circuit breaker doesn't trip in air fluff then there is likely a short in the heating element.
With a clamp-on amp meter you can read the amp draw of the dryer when it is heating. With the motor and element both working you would see approximately 25-26 amperes being drawn. The breaker is rated at 30 amps. If the breaker trips and only 26 amps are being drawn then the breaker is the problem.
Try the air fluff cycle first and see if the breaker will trip. Then with additional details I may be able to help you further.
Well a dryer heating element does draw quite a bit of amps(that is why it is 220) but it cycles on and off & it is not an appliance that is used everyday. The first think I would do is read the electric meter and verify that it was not misread before condeming the dryer. If the electric meter reads are correct then it is possible it could be the dryer heating element shorting. How much do you actually use the dryer? Is the heating in your house electric and have you been using it? You could also have your electric company test the meter. Look at your usage of electricity for last year at the same time(it will be on the bill) and see what the number was.
It is possible that you could have a bad breaker in the panel. They will start to trip randomly when they are going bad. If not the dryer is drawing too many amps and the breaker is doing it's job. If the heating element is defective and drawing extra juice that could trip the breaker. Usually replacement breakers are not too expensive if you electrical panel is less then 20 years old and can be purchased at most home improvement stores. I would try replacing the breaker before you try repairing the dryer. If you install a new breaker and the problem continues to happen then you should check the dryer heating element. That component is what draws the most amps and would be the most common one for tripping the breaker.