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  1. I recently got a "free" hot tub.... man are those some quotation marks!! OK... here's the story. After spending a good deal of time unfreezing my new "free" hot tub and running some expensive electrical wire.... I finally fired it up. Day 1: Temp (57° water) is displayed but "TEMP" logo is blinking. Water does not seem to be moving. I diagnosed as a circ pump issue. Pulled apart circ pump... did not seem to be anything wrong. Put back together... worked shortly and crapped out again. I purchased a new circ pump from the local spa place. Inlet and outlet are only 3/4 not 1"... I just buy some reducers and hook it back up. I can't get the control panel to stay on for more than 5 minutes. I decided that during transport the circuit board got dirty... I give up... drain tub... prepare for 10° temps. Day 2: I take circuit panel out... clean with electrical contact cleaner and tooth brush... Reinstall... Now... Topside control panel: Displays, "TEMP" not blinking and "F"... but not actual temperature reading. I hear some clicks then the topside control panel changes to ---- Then the panel resets.... shows same information.... Then resets again... I get ---- and the circ pump runs (i definitely see water moving)... but ---- continues to show Circuit board in the mean time: LIM OK LED is on HTR ON LED is off Control Unplugged LED is on Clicking... LIM OK flashes on then off LIM OK LED is off HTR ON LED is off Control Unplugged LED is on Clicking... LIM OK flashes on then off LIM OK LED is off HTR ON LED is off Control Unplugged LED is on LED D17 remains red lit I leave tub on .... with space heater in Jet pump compartment, water still moving (hopefully preventing a freeze) Day 3: I check limit sensor for resistance.... when cold: the multimeter jumps from 1 (meaning no connection) to 17 kohm when warm (I put the sensor in my mouth) I get a consistent reading under or around 10kohm I check the pressure switch... seems to have continuity when the circ pump is running I jump the pressure switch... does not change anything I check for continuity through the heater... seems good I pull the topside control panel plug and try to start the tub... same sequence from above... I decide main board is bad Day 4: I install a new main circuit board.... same result.... ERRRGGGHHH PLEASE help.... I am at a loss... I am going to have to call the tech out I think.
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