CliffT Posted April 11, 2021 Report Share Posted April 11, 2021 My HT has a flashing green light that I can’t seem to fix. The issue started with flashing red and green lights. Our hot tub dealer had us replace the pressure switch which led to a flashing red light. This time our HT dealer had us change the high limit and thermistor. Now we are at the flashing green light. What I’ve done so far. 1: Bled the circ pump line. 2: Tested ohms on new thermistor and high limit. Within 1 ohm of each other. 3: At this point dealer called Watkins tech support who said the control board is bad. Ordered board. 4: Installed board. No change. 5: Re-installed old board and old thermistor. No change. 6: Drained tub. Re-filled slowly through grey pipe. 7: Reset breakers several times during 1-5. 8: Have tried with and without filters. 9: Jet pump one and two working fine. 10: Cycled through the valves on each jet pump to be sure all lines were clear and all jets worked. After refilling the circ pump would not run. Cracked the wet side and got air and water and pump fired up. Green light still flashing. Opened up the waterfall valve and bubbles stop coming from bottom of tub. Close waterfall valve and bottom tub bubbles start again. I am here air crackling through circ pump. Bled pump again. No change. Removed 1/4 tube on back of heater to bleed air. No air escaped. No change. Any ideas? Quote Link to comment Share on other sites More sharing options...
RDspaguy Posted April 11, 2021 Report Share Posted April 11, 2021 Well, by process of elimination, you are down to circ pump or controller. Post a picture of your circuit board, wiring diagram, manufacturer sticker, and breakers with wires visible. Quote Link to comment Share on other sites More sharing options...
RDspaguy Posted April 11, 2021 Report Share Posted April 11, 2021 @castletonia, any idea what a flashing green light means? Quote Link to comment Share on other sites More sharing options...
CliffT Posted April 11, 2021 Author Report Share Posted April 11, 2021 Quote Link to comment Share on other sites More sharing options...
CliffT Posted April 11, 2021 Author Report Share Posted April 11, 2021 Sorry about the upside down photos. I tried to get them in correctly but. No luck. Quote Link to comment Share on other sites More sharing options...
RDspaguy Posted April 12, 2021 Report Share Posted April 12, 2021 The center of 3 sensor harness connections at the top center of the board is off. Quote Link to comment Share on other sites More sharing options...
CliffT Posted April 12, 2021 Author Report Share Posted April 12, 2021 Sorry but I don’t understand what you mean. Quote Link to comment Share on other sites More sharing options...
CliffT Posted April 12, 2021 Author Report Share Posted April 12, 2021 Do you mean the highlighted harness? Quote Link to comment Share on other sites More sharing options...
RDspaguy Posted April 12, 2021 Report Share Posted April 12, 2021 Yes. It is off center. Quote Link to comment Share on other sites More sharing options...
CliffT Posted April 12, 2021 Author Report Share Posted April 12, 2021 Okay I corrected that mistake. No change. Quote Link to comment Share on other sites More sharing options...
RDspaguy Posted April 12, 2021 Report Share Posted April 12, 2021 Then, since that is the pressure switch wire, it would suggest that your pressure switch is not closing. Is the circulation pump running? Remove filters. Remove the pressure switch harness and short between the two pins on the board that it plugs on to with a small screwdriver for a few minutes. Does the light and heater come on? If so, check for flow restrictions and circ pump operation. Strip a small section on both pressure switch wires in the cable and twist them together to bypass the pressure switch. Quote Link to comment Share on other sites More sharing options...
CliffT Posted April 12, 2021 Author Report Share Posted April 12, 2021 Yes the circulation pump is running. One thing to note. When I installed the pressure switch it never got tight. Seemed like I could turn it forever. Is that a problem? Ill try the other steps although I’m not sure I’m following how to “Strip a small section on both pressure switch wires in thecable and twist them together to bypass the pressure switch.” Quote Link to comment Share on other sites More sharing options...
RDspaguy Posted April 12, 2021 Report Share Posted April 12, 2021 The two wires in the pressure switch harness have to have some insulation (plastic covering) removed so that the copper wires inside can be made to touch, then twisted together so they remain touching. The pressure switch should not spin free, it is a threaded fitting and should stop turning once tight. Quote Link to comment Share on other sites More sharing options...
CliffT Posted April 12, 2021 Author Report Share Posted April 12, 2021 Did the screw driver test for three minutes. Heater did not turn on. Rather than strip the wire a taped the ends of the pressure switch harness together. See picture. I also added a video of the circ pump running. Still have the same problem. IMG_3701.MOV Quote Link to comment Share on other sites More sharing options...
tjr Posted April 12, 2021 Report Share Posted April 12, 2021 The temp control thermistor is plugged in wrong at main circuit board. Power down hot tub and move the 4pin connector that is right next to the "limit ok " led to the 4pin that is labeled"regtherm" 1 Quote Link to comment Share on other sites More sharing options...
CliffT Posted April 12, 2021 Author Report Share Posted April 12, 2021 That was the problem. I am positive that the old thermistor was not plugged in that slot before. Thanks for the help! Quote Link to comment Share on other sites More sharing options...
RDspaguy Posted April 13, 2021 Report Share Posted April 13, 2021 6 hours ago, tjr said: The temp control thermistor is plugged in wrong at main circuit board. Power down hot tub and move the 4pin connector that is right next to the "limit ok " led to the 4pin that is labeled"regtherm" Good eye @tjr. Gold star for you, buddy. ⭐ Quote Link to comment Share on other sites More sharing options...
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