Is this a new install or exsisting?
If it new install make sure the nuetral wire going to the spa is in the nuetral load screw on the breaker and not the nuetral bar.
Verify wiring to spa and breakers.
Exsisting install
Pull the wires out of the spa control board and test voltage. If the breaker stays on press the test button on the breaker to see if it works.
If your spa has a Black control box with 1 breaker. Remove wires with power off.
1. disconnect the heater wires and test. If spa runs bad heater if not. reconnect.
2. try removing wire to ozonator if equipped.
3. try pump wires.
4 try blower wires if equipped etc etc
If is has a blue control box with 2 breakers.
Verify all connections.
The heater has a seperate board. It is were the power wire go. Look for black burn marks on this board. The heater wires are black and white colored remove them and continue with same test procedure.
It's an existing install, about 2 months old.
If I press the Test button the breaker, it does not trip.
I have a black control box (Invensys Controls). I unplugged both pumps, heater, and ozone from the controller board, still no luck. it does click, and my meter detects the voltage, but then voltage drops back to 0 within a second.
I looks at the fuses, it does not look black or burnt, can't see any filement inside because it is covered. Even when I remove the fuses I get the same click sound.
If I unplug wires from the GFCI breaker on the SPA side, check the voltage on the spa side of the breaker, I also get 0. It is the GE breaker kit that came from Watkins.