Sundance®/Jacuzzi® Hi-Limit Sensor w/ Box-End Connectors, 22 in – 6600-168
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Key Features & Benefits
Built for Sundance® and Jacuzzi®
Made for the box-end hi-limit circuit on Sundance® 650, 850 and 880™ systems and Jacuzzi® J-300™ and J-400™ models.
Heater Overheat Protection
Engineered for seamless compatibility with original mounting points for secure placement.Monitors temperature at the heater so the control can shut the heater down before the water gets too hot.
22 in Cable, 1/4 in Bulb
Short 22-inch lead with a 1/4-inch bulb that slides into the existing heater sensor well.
Box-End Plug
Plugs straight into the original box-end hi-limit position on the control board, with no splicing.
Heat-Shrink Included
Ships with heat-shrink tubing for a clean, protected finish on the cable.
Cross-Referenced
Also cataloged as 59-455-1204 and 6600-168-JC, so you can match it to your parts list.
Product Overview
The 6600-168 is the replacement hi-limit sensor used on many Sundance® Spas and select Jacuzzi® hot tubs. It is a 2-wire electronic sensor with a 22-inch cable, a 1/4-inch bulb and box-end connectors, and it ships with heat-shrink tubing. The hi-limit sensor is the safety partner to your spa's water temperature sensor: it watches the temperature at the heater, and if the water gets hotter than the control's preset limit, the control shuts the heater down. A failed or damaged hi-limit sensor can leave the heater locked out, cause overheat or hi-limit error messages on the topside, or stop the spa from heating at all.
Dealer fitment references list this sensor for Sundance® 650, 850 and 880™ series spas from 1995–2005 that use a bypass heater, 2006 and newer Sundance® 880™ systems, and older Sundance® 400, 600, 600S and 750 models with bypass heaters. On the Jacuzzi® side, it is listed for 2002+ J-300™ LCD systems, 2002–2003 J-350, J-360, J-370 and J-380 models, 2004–2006 J-355, J-365, J-375 and J-385 models, and 2006–2009 J-400™ models. It is also cataloged under 59-455-1204 and 6600-168-JC. Sundance® and Jacuzzi® have used several sensor plug styles over the years, so compare the box-end plug and short 22-inch cable on your old sensor before ordering; the 12 ft 6600-167 is the matching box-end water temperature sensor, not a hi-limit.
To replace it, turn off power at the breaker, note how the old sensor is routed, slide the new bulb fully into the same heater sensor well, and plug the box-end connector into the same position on the control board. One dealer notes that the current bulb can be slightly slimmer than some original sensors, so make sure it sits snugly in the well as your spa's service manual directs. If you aren't comfortable working inside the equipment bay, have a qualified spa technician do the installation.
Frequently Asked Questions
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It monitors temperature at the heater. If the water exceeds the control's preset limit, the control shuts the heater down to protect the spa and bathers.
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Dealers list Sundance® 650/850/880™ (1995–2005, bypass heater), 2006+ 880™, older 400/600/600S/750 with bypass heaters, and Jacuzzi® J-300™ LCD (2002+), J-350–J-385 and J-400™ (2006–2009).
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The cable is 22 inches long, with a 1/4-inch bulb and box-end connectors.
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Yes. Distributors catalog the 6600-168 under 59-455-1204, and it is also listed as 6600-168-JC.
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No. The 6600-167 is the 12 ft box-end water temperature sensor. The 6600-168 is the 22-inch hi-limit sensor that sits at the heater.
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Common signs are overheat or hi-limit messages on the topside, a heater that locks out or won't start, or a spa that shuts off heating while the water is still cool.
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It isn't required. On older 850/880™ systems many owners replace the temperature sensor (6600-167) and hi-limit sensor together since both are the same age.
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Handy owners often do. Turn off power at the breaker, swap the bulb into the same heater well and plug into the same board position. Use a qualified technician if unsure.
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One 6600-168 hi-limit sensor with 22-inch cable and box-end connectors, plus heat-shrink tubing.
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