Keeps tripping the breaker

Maybe undersized wire, or breaker is loose on busbar.
http://waterheatertimer.org/Color-codewire.html
http://waterheatertimer.org/How-to-replace-circuit-breaker.html
http://waterheatertimer.org/Troubleshoot-household-electricity.html#stress
Move wires to another same-size breaker.
Use nose and ears to listen for crackling and burning at circuit breaker.
See if breakers feel warm.
Add comment and say what you find

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Leaking heat element.
2 GFCI on same circuit.
Rat-chewed wire. Inspect wiring.
Nail through wire.
Melted wire nut in junction box.
Undersized wire and breaker has been overheating breaker, and breaker has gone bad.
Shorted breaker. Move wires to different same-size breaker.
http://waterheatertimer.org/How-to-wire-GFCI.html#2-pole-gfci
http://waterheatertimer.org/Color-codewire.html

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

Assuming you have Paragon 4001 40 amp 120Volt timer
By-pass the timer so only pool pump is connected to breaker.
To do this, move wire from terminal 2 and connect to terminal 1.
If breaker no longer trips, then replace timer with Intermatic T101
http://waterheatertimer.org/How-to-wire-T104-Intermatic-timer.html#T101
Crossover wiring: Paragon terminal 1 goes to Intermatic terminal 1.
Paragon terminal 2 to Intermatic terminal 2.
Paragon terminal 3 to Intermatic terminal A
If breaker keeps tripping after bypassing timer, then tighten wires on circuit breaker and test again.
If breaker keeps tripping, then move wires to another same-size breaker.
http://waterheatertimer.org/How-to-replace-circuit-breaker.html
Breakers trip when they sense overheating.
If motor is causing problem, you might need electrician to track down source of overheating.

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

A tripping circuit breaker is an indication of an overload. You say there is no load on the breaker - how are you making this determination? Are you using an amprobe or some other meter?

A circuit breaker with NO load shouldn't ever trip. Likewise a circuit breaker carrying up to 80% of of the current it is rated for shouldn't trip either. Circuit breakers that carry more than 80% of their load will trip - if the load remains connected long enough. This is called "duty factor" or "service factor" The greater the load is in excess of 80%, the less time that the breaker will carry it before tripping.

An example of a 100 amp breaker with different loads on it (this 100 amp value was chosen for ease of doing the math):

80 amps - never trips
85 amps - trips after 48 hours
90 amps - trips after 16 hours
95 amps - trips after 8 hours
100 amps - trips after 4 hours
105 amps - trips after a few minutes
120 amps - trips after a few seconds
150 amps - trips instantly

This is only an example to show how a certain circuit breaker might trip under a load less than the rating stamped on the body or handle.

A circuit breaker that trips with no load or a load equal to or less than 80% of its rating is most likely defective. You need an amprobe or ammeter for amp readings. If the load is found to be 80% or less, there may be an issue of harmonics that is causing the tripping. You'll need to have special equipment and qualified persons to check harmonic problems. Most harmonic problems occur when the loads are not linear device (transformers). Examples of non-linear devices are "switching" (or solid state) power supplies like those in computers.

I hope this helps and good luck. Please rate my reply. Thank you.

Disconnect the black power wire where it is connected to the furnace with breaker off. Put a wire nut on it and then turn the breaker on. If it continues to trip, the problem is not the furnace and you will have to trace the power wire back to the breaker box to find problem. Next, disconnect the black wire from the breaker (with breaker off) and then snap breaker on. If it trips, bad breaker. If the furnace was disconnected and breaker did not trip, you have a short either on the P C Board or the transformer.

Disconnect compressor leads and tape them up. Restore power, if the breaker does not trip, than you have a grounded compressor.

If breaker trips again, hook compressor up and disconnect blower, if breaker does not trip you have a
bad blower motor.

two main reasons breaker trips is the pump motor jammed [not turning]or the heater shorted out --disconnect power open access panel disconnect the lines to the heater turn on power if breaker trips than motor /pump problem if doesnt trip than heater problem can order heater replacement online or pool spa store--if motor pump check pump for debris and motor for lube if u can turn shaft or impeller oil motor and work it into bearings if still not turning possible need to replace motor unit

Hi .. when a breaker trips immediately it can mean there is a problem in the circuit. You can start troubleshooting by unplugging the washer, or disconnecting it and trying the breaker again. If the breaker holds with the washer disconnected, then the fault is inside the washer. You would be better to have a tech look at the washer for a solution.

try a new breaker, they do wear out over time

sometimes gfi outlets go bad and trip try testing with a heavy draw machine in it or just replace it and see if this fixes the problem