We cann't control all of switch while circuit breaker tripping time.

What Trips?

• the "Actual" electrical circuit breaker?
  
  • Is it GFCI Style?

or...

• Is the high limit switch tripping?,
  • which isn't actually a breaker.
• A circuit breaker is a breaker that toggles as a switch, and to reset it you have to switch the toggle switch ALL the way to Off position to reset, then switch it to on.
  • Same thing if it were a GFCI style, it just has a 'Test' button on the body of the breaker, that button is usually a white rectangular button.
• Some systems have a GFCI breaker that looks totally differnent from above... It's located on the control system itself, very similar to what you may have in your bathroom or kitchen of your home! It will have a 'Test' button AND a 'Reset' button.

A High Limit Switch, acts like a breaker, as it will trip when it senses a temperature greater that it is set for as a safe temperature. Once that temp is breached, it will trip.

So... Which one is tripping for you? What are you resetting to turn it back on?
if circuit breaker, it has nothing to do with the 100 degree temp you mentioned. If that trips,= electrical problem, either a short or overheated electrical appliance (internal wires) aging motor pulling too much current, loose electrical connections generate heat, etc.
if High Limit, then possible overheat of water? Many times, failed thermostat. I already know what you're thinking... But I never saw water get Hot! But... Many times that IS just the case , it's just you never noticed the water hot, and it has been cooling down when you saw it.

I would start by replacing the breaker. They do become weak over time.

Get an electrician in, do mess about u could burn the hse down. Wiring probably cann't handle the specialist load.

I happen to have one of these in the box, so I've reviewed the installation & on-line literature for this model. Let's address installation notes:
Don't connect more than 250 ft of load conductor for the total one-way run, to prevent nuisance tripping.
The breaker is to be used on grounded power supply circuits only. We're talking a properly-grounded breaker box, not just the protected circuit.
Look at the side of the breaker. You will notice that the curly white wire is meant to be connected to the (properly grounded) neutral bar in your panel.
The circuit neutral that you're protecting should be landed on the terminal just above that curly wire. Make sure you have the right neutral!
The circuit's hot wire would of course be landed on the topmost screw.
You did not state what you mean by "the breaker next to it": just above, just below, or directly across from the GFI breaker?
I suspect that you meant just above or below the GFI breaker. And I assume you've swapped out other breakers to rule out a defective breaker.
Now, it is possible that you have a "shared neutral" situation. It's a common wiring practice to use one neutral wire for two "hots", where one circuit is fed from the phase A side and the other is fed from the phase B side, (which you'll have in a two-pole, 220V breaker), picking up a 110 volts from each phase. The two 110v "Hots" share a single neutral wire between them to carry return current. The phase shift between the two phases allows this.
However, to avoid nuisance tripping of your GFI, your protected circuit cannot share neutrals with another circuit, as the "other" circuit's operation will cause the 6 milliamp differential between current out (hot) and current return (neutral) which the GFI by design senses and trips.
Your GFI-protected circuit probably needs its own dedicated neutral!
I'd like to hear what you find. Good luck!

It normally means that you still have a short somewhere in that home run. SO something that the circuit breaker controls is drawing more amperage than what the circuit breaker is rated for. So you need to unplug everything on that line and then plug them in one at a time until it trips the breaker.

if the breaker has tripped the test button won't do anything ,, for the breaker to trip something down stream of it is causing this to happen,, check all the switches and or receptacles in the circuit that are controlled by this breaker, 3 types of line problems cause tripping,, ground to line, Line to line, and line to neutral. in this ,, also consider that extension cords, faulty appliances , ( lamps, radios, anything plugged in with a feedback short ) will cause the breaker to trip. even a nail to hang a picture that pierced the wire can cause this, add to that , a AFCI breaker will trip much more easily than one thats not, or even a GFI breaker, , try this, if you have the knowledge to do electrical work in a panel, if not get someone who is, switch the tripping breaker with another one of the same value, ( in this case 15 amp) see if the one you put in place of the one thats giving you problems trips. If it doesn't, you have a weak or bad breaker, so just replace that one, if it does, your going to have to trace out that entire circuit to find the reason for the feed back into the panel

the line in order shouldn't be an issue as they run in series of 3 , it sounds to me like you just have a weak breaker that trips with little feedback, and isn't resetting correctly

First, check the outlet that it's plugged into, to make sure that there's still power to the outlet. If there isn't, then the circuit breaker for that outlet has been tripped, in your home's circuit breaker panel. Leave the dehumidifier unplugged and reset the circuit breaker. If it trips again, without the dehumidifier unplugged, then the outlet is at fault. Perhaps there's a loose wire connection or the interior of the outlet is cracked.

If it didn't trip without the dehumidifier plugged in, plug the unit it in,. But, before you do, make sure the dehumidifier's Master ON/OFF Switch is OFF. Once it's plugged in, turn the Master ON/OFF Switch to ON and set your controls. If it runs now, GREAT! If it trips the circuit breaker again, there's either a short in the power cord or an internal electrical short. Which will require extensive troubleshooting to find.

Hope this helps you solve the problem. Please let me know. Thanks.

You've lost power to the timer. Look in your main circuit breaker panel for a two-pole breaker that has tripped. Turn it to full OFF, then back ON.
Sometimes it hard to detect if a breaker has tripped, so turn it OFF, then ON anyway.
If that doesn't work it's possible that the circuit breaker is bad.