Sundance Spa 6600-166 Temperature Sensor for Hot Tubs and Pool Heating Systems. This temperature sensor is a replacement part compatible with various Sundance Spa models. Designed to help maintain proper water temperature, this temp sensor is essential for resolving common error codes such as OH or ICE on your hot tub display. Compatible with: J-270, J-280, J-355, J-365, J-375 (2007+); J-210, J-220, J-230 (2005+); J-200 LED Models; J-325 (2005–2007); J-335, J-345 (2004+); Del Sol (2003–2005); J-320, J-330, J-340 (2002–2003); J-300 Series (2002+); J-350, J-360, J-380 (2002–2003); J-355, J-365, J-375, J-385 (2004–2006); and all J-400 Models (2006–2009). Also fits 880 Systems (2005+), 850 Systems (1997–2005), 400, 600, 600-S, 750, 800, and 850 Systems. Compatible with Suncoast (1992), Suntub SVDV Systems (496–498), and 850 Systems (1997+). Replaces part numbers 6600-138 and 6600-105. Interchangeable with 6600-182 sensor (stainless steel) with box end connectors. For inground spas without a skirt, refer to model 6600-169. Easy to install: Simply disconnect the old sensor and connect the new one by splicing the wires to the control board. Ensure power is off before installation. Package includes: 1 x Temperature Sensor. Note: Colors may vary slightly due to lighting and monitor settings. Measurement may vary by +/- 1–3 cm.