Diagnosing what is wrong with a hot tub - first step

A spa with no power at all, no indicator lights, nothing at all, use these steps to troubleshoot a hot tub with no power.

TRIPPED RCD

Check the main RCD that provides power to the spa. This may be located in the home main panel, or inside a smaller panel near the hot tub. To reset a circuit breaker, first push it towards OFF, and then flip it back to ON. If the breaker begins to repeatedly trip (known as nuisance tripping), it may need to be replaced, or there could be voltage irregularity. Consult your electrician for testing or replacement.

BLOWN FUSE

Spas and some hot tubs have internal fuses, which are meant to blow when voltage spikes occur, to protect your equipment (pumps, blower, heater). A blown fuse could just be a blown fuse, or it could point to a blower or pump that is shorting out, or it could mean the transformer is allowing too much voltage to pass through. Check your owner's manual for location of any fuses, and always replace with the exact duplicate fuse.

FAULTY WIRING

Incoming wires can be damaged from heat or rodents, or you may have loose connections, or wires touching each other. This will often cause an RCD to trip or fuse to blow, but not always. If it's the wires carrying power into the transformer, or out of the transformer, you can have a 'no power' situation. Shut off all power before touching or replacing any damaged spa wiring.

TRIPPED HIGH-LIMIT SWITCH

In some spas, a heater high limit switch can cause a complete power shut down, to protect equipment (and you!) from harm. If your spa pak has a hi limit reset button, (usually red), not that common in the UK give this a push to see if power is restored. Thermal overloads (motors, blowers), can also prevent equipment from coming on, but don't usually shut down all power and lights to the spa.

BAD PANEL

Finally, if you have no indicator lights on your control panel, look underneath for lights on the spa pak. For a control panel that is unresponsive, with no LED's or temp reading, check the wire harness from the spa pak to the circuit board for a loose connection or damaged wire. It could also be a bad circuit board (but I hope not!).

Finally remove all leads, pumps, blowers, heaters, ozone the light the lot, switch back on and then if the topside lights up then its one of these components causing the fault. Add them back one by one once the spa goes dead again then its probably the last components added that's at fault.

Ring us if all the above fails - you will probably need an engineers