We have a hot tub that came with the house we bought in Nov 2007.

Make: Great Lakes
Model: Ontario
Year: 2004

Other Info:
Max Capacity 240 gal Normal Oper 170 gal
Dimensions 87"l x 58" W x 33"H -3 person seating
Total jets 18
Filtration System- Automatic 2 cycles per day - Suction- Side Skimming Filtration, GPM Disposable Filter Cartridge
Manifold Plumbing Balanced Pressure Distribution
Balboa Value Series Digital System
3 button Digital Electronic Control Panel
2.0 HP (3.5 BHP) 2-speed pump
5.5 KW stainless steel heater
dual overheat/frees protection circuits
Covertible to 110/20amp with optional GFCI cord, and 1.5 HP pump

PROBLEM: We cleaned the hot tub (April) since receiving it in November 2007. The only thing we hadn't changed was the filter. Up until a couple days ago, we could use the jets on low and high power and keep it at a temp of 101-103.
We just sat in it the other night and decided to turn the jets on high. After 5 minutes it tripped the breaker. Now every time we turn the jets on high, we trip the breakers.

Any advice as to what to check or what might be doing this?

Thank you
Cooper31