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That unit has a GFCI breaker installed. Those are made to prevent electrocution. IF there is ANY water leakage from the pump into the area that supplies voltage, the breaker will trip. Make sure that there are no damp areas inside the unit and make sure that you have all the wires that it connects to wired correctly and have ground connections.
There are a number of reasons this could occur. First, what type of dryer is it? I assume its electric or else it wouldn't be tripping breakers. It it a 115v apartment type or a 220v unit? Is it the only thing on the circuit? Regardless of the power source, it should be the only device operating on the circuit since it draws so much current to operate. Is the circuit breaker rated for the current of the device? If it is the only device on the circuit in question, and the circuit breaker is adequate for the device, then there is also the possibility of a loose wiring connection in the circuit causing excessive current flow, the breaker could be defective, or the dryer itself may have an issue with drawing too much current. I would eliminate all external possibilities before blaming the dryer itself.
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.
May not be your dryer. Many times a loose wire at the circuit breaker panel will cause the breaker to get hot and then thermal trip the breaker. It may be worth a look. Remove circuit breaker panel. Turn dryer breaker off. Check wire lug screws for being loose. Make sure screws or snug but do not tighten and strip the threads. Be especially careful if the wire/cable is silvery aluminum colored. If that is the case make sure there are not any broken strands at the breaker lugs. If possible use a clamp on amp meter to check the operating current. The current should not exceed 80 percent of your breaker rating. It is most likely a 30 Amp 2 pole. You may also have a bad breaker. If a breaker has a weak spring or bad contacts it will easily get hot under load and trip. My best guess other than a dryer motor locking up or dragging. New breakers are inexpensive at HD or Lowes etc. Be sure to get the exact brand and model if replacing.
30 is the correct size breaker for this unit. It sounds like there is a grounding issue going on in the system. Or off of the Thermostat. Something is grounding out causing the switch to trip. Are you running #10 wire to breaker and the unit? If not you will need to increase your wire size