Hot Tub Not Powering On

• Check for Error Messages: Most modern hot tubs can give error codes if something is wrong. Before continuing, look for error codes, or any blink codes that might explain the issue.
• Power Cycle your Hot Tub at the GFCI Breaker: A simple restart can resolve temporary issues with just about any device, and hot tubs are no different. Now, every spa is different, and you might want to refer back to your hot tub's owner's manual for specific instructions, but most hot tubs will need to be powered off at the GFCI Breaker. Switch the breaker off for 10 minutes, switch it back on, and see if the temperature increases.
• Check for Blown Fuses: Power spikes, surges, or other incorrect voltages can cause your hot tub’s fuse to blow. Check if the fuse on your hot tub’s control board has blown.
• Look for any Leaks or signs of corrosion: If a leak occurs inside your hot tub, then it is likely that unprotected components may have become water-damaged. Look for obvious signs of corrosion or liquid damage.
• Attempt a Hard Reset: Like other electronics, sometimes a hard reset is all that is needed to fix an issue. Check your hot tub's user manual for instructions on restarting it correctly, but generally, you can reset it at the GFCI breaker.

External components like incoming wires can gradually become damaged over time. This can result in loose connections, wires touching each other, shorts, or even complete breaks in the power line.

• Look for any exposed wiring caused by pests. Mice and other pests chew through electrical insulation, exposing the copper wiring to the outdoor elements. Look for any indication of damage to the wiring, including teeth marks or exposed wires. If the cabling is damaged, then it will need to be replaced.
• Other symptoms to look for are: Fuses or circuit breakers popping can indicate that your system is short-circuited.

Some Hot tubs feature a high-limit switch, a safety feature that prevents the heater from overheating. If the switch senses that the spa water has reached 110° F or 120° F, it trips and shuts off the heater and pump as a safety precaution. This only applies to the heater, not the high-limit switches on your hot tub's motor or blower.

• Check your High Limit Switch: Typically, this is a big red button in the thermowell of your hot tub. You must push it to reset the switch.
• Check if the High-Limit Switch is defective: High-limit switches should only trip if the water temperature is too high. If the switch tripped while the water temperature in the thermowell was the same as in the rest of the spa, it is most likely damaged and needs to be replaced.

Power transformers reduce your home's higher 240 volts to a lower, more usable voltage (this will vary from hot tub to hot tub). If your hot tub's transformer isn't delivering the correct amount of power, it won't power on.

• Test your hot tub with a multimeter: Use a multimeter to test the transformer output voltage within 10% of the rated output voltage. The rated output is usually printed right on the transformer.

It could very well be that your hot tub is getting power, but your control panel could be faulty, preventing you from turning on your hot tub.

• Look for other signs of life: If your control panel still does not have indicator lights, look underneath for lights on the spa pack (Basically your hot tub's motherboard, where everything connects).
• Check the Wiring Harness: Sometimes, the wiring from the control panel to the hot tub's main board can become loose over time. Try reseating the wiring from the control panel to the main board.
• Check for damaged wiring: Check for exposed or severed wiring. If any of the wiring is damaged, it must be replaced.

If all else fails, the likely issue may be your hot tub's spa pack. If you suspect this might be the case, try examining the spa pack's board for any signs of burnt or damaged components.