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HydroQuip ECO 2 and ECO 3 Circuit Board spa controls use this hi limit temperature sensor 34 0201D with a 12 long 1 ft 2 wire cable with a 2 pin plug, and a 14 x 1.5 long stainless steel sensor bulb. Also used on Gecko MSPASSPA controls to replace Gecko 5 60 6019 and 9920 400262. The bulb goes into the thermowell and the plug connects on the pc board. Signs of temp sensor failure include different display and actual temperatures, or HL error codes. Check the plug and wiring for any damage, or other obvious signs of failure, which may not always be evident.
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