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Step Seven: Your Control Box
The "control box" refers to the brains of a hot tub. Normally located directly below the topside control or nearby.

The control box houses the pcboard, transformer, incoming power terminal, and component terminals (sockets) that the pump and other components plug into.

Rarely do you need to replace the complete control system. Usually they are not available. The notable exception is the T-1000 control system that has the control box sealed to protect the individual parts protected.

Most common you replace the pcboard or transformer or terminal or component socket only.

Rarely are pcboards built to only apply to one specific specification. The board manufactures have a special onboard configuration that tells the board what you have. Be VERY cautious thinking "it looks the same" mentality. Almost all suppliers will NOT take back a pcboard except under warranty and you get the same board back. We have a more understanding approach but most do not.

Being an electronic pcboard makes it more prone to surges, brownouts, blackouts, and lightning. If you have to replace a board more often then 5 years consider getting a surge protector for the hot tub and maybe the whole house. All these types of voltage issues can damage, confuse, or destroy today's pcboard. I have been at homes that needed the pcboard, topside, heater, and pump replaced because of a lightning bolt. Its not typical but a bolt can do a lot of damage. That is why if you have a surge in the house make sure the hot tub control system is working correctly.

Most boards have "jumpers" that require telling the board what to do. Jumpers can tell the board you have 1 or 2 boards. Or if you have a circulation pump. So keep the old board and match to the new. Newer boards also can be programmed by the topside control for filter times and various other issues.