sunken soaker Posted June 11, 2020 Report Share Posted June 11, 2020 Water got too hot in my 95 Tiger River Manora M351139. Checked thermometer, said 115°. Turned down temperature all the way. Left for a while with the lid off to cool it down. Came back out and it was still about 114°... and the circulation pump was off. Pulled the GFI. Plugged back in, and circ pump and ozonator went back on. Figure that meant the High Limit Thermistor was working? Unplugged the heater.(top plug). Next day it was down to about 90°. Plugged it back in. Temperature relay seems to click on at about 9 o'clock on the Temp dial. Started rising. Tested with an ohm meter. Said 4.9 4K at 106°. (That was the top plug.) What is the top plug? Bottom plug turns off circulation. Said 4.3 ohms at 106°. Temperature relay seems to click on at about 9 o'clock on the dial even at 106°. Is there a test for relay also? Got relay back in 2014. The end of 2009 got a Watkins low flow heater assembly 1.5 x 6 K. Then a Watkins control thermistor high limit thermostat. Also in 2014 got a Watkins PWA interlock kit And a Tiger river water check valve in 2018 Anybody know what we might check? Quote Link to comment Share on other sites More sharing options...
RDspaguy Posted June 11, 2020 Report Share Posted June 11, 2020 Wow. I have to congratulate you on having a working (sort of) 25 year old tub. That thing was new when I started in this business! I haven't seen one of those in a decade or more, so forgive me if I am a bit rusty. @castletonia, can you get some specs on this to refresh my (failing) memory? @CanadianSpaTech, we might need to brainstorm on this one, buddy. Post some pics of the equipment area and heater. I won't ask you to drop the control box yet, but it's going to happen before we are done so if you want to go ahead and do that it would help to have a pic of the control box contents as well. It sounds like you know how to do that if you replaced a relay before. Off the top of my head I'd say faulty thermostat control, which is part of the circuit board iirc. What are the ohm readings from? Quote Link to comment Share on other sites More sharing options...
sunken soaker Posted June 11, 2020 Author Report Share Posted June 11, 2020 Quote Link to comment Share on other sites More sharing options...
sunken soaker Posted June 11, 2020 Author Report Share Posted June 11, 2020 Oldy but Goody... like me. 😁 Top and bottom plug. Got this trouble shoot from Backyards Plus for Ohm reading... THERMISTOR, CONTROL THERMOSTAT, HOT SPRING & TIGER RIVER 1995-2002.5 https://www.backyardplus.com/proddetail.php?prod=38416 Looks like it's good? Quote Link to comment Share on other sites More sharing options...
CanadianSpaTech Posted June 11, 2020 Report Share Posted June 11, 2020 Dang that's cleaner inside than a new spa. Little out of my wheelhouse. Gotta ask about the fork...lol Quote Link to comment Share on other sites More sharing options...
Cusser Posted June 11, 2020 Report Share Posted June 11, 2020 1 hour ago, CanadianSpaTech said: Dang that's cleaner inside than a new spa. Little out of my wheelhouse. Gotta ask about the fork...lol I saw the fork too ! And that spa is a lot simpler inside (and cleaner inside) than my 1988 CalSpa is. Quote Link to comment Share on other sites More sharing options...
sunken soaker Posted June 11, 2020 Author Report Share Posted June 11, 2020 Trying to support the air injectors on top we replaced three-quarter inch tubing. 1 was dripping, and full of water. Tried re-clamping but some of the nipples were broken. Most we were able to reclamp, and supported them up....with a fork and Knife🤣 (evidently they used to be clamped up there to keep them above water level. Didn't see any evidence of clamps or other way to do it.) 1 is still dripping and full of water. Just checked this morning, it is 102° and the dial still all the way off.🤔 Quote Link to comment Share on other sites More sharing options...
sunken soaker Posted June 11, 2020 Author Report Share Posted June 11, 2020 Found this picture of a control box on the Internet. I think it's the same one as mine. https://pool-spa-supplies.com/watkins-tiger-river-circuit-board-tiger-river-main-pre-95-tiger-river-115v-70374?utm_source=google_shopping&gclid=EAIaIQobChMI54-mmpj66QIVZxitBh2EEgjiEAQYDiABEgKUg_D_BwE Quote Link to comment Share on other sites More sharing options...
RDspaguy Posted June 11, 2020 Report Share Posted June 11, 2020 Not what I expected from a 95 watkins. You said "dial" and I imagined something completely different. So your topside has a dial that engages the heater at a certain spot regardless of temp? That thermistor chart should be good, but what is important is that both thermistors are within a few hundred ohms of each other. If they are not, replace BOTH. If the thermistors are good it's the topside or board. 2 Quote Link to comment Share on other sites More sharing options...
sunken soaker Posted June 11, 2020 Author Report Share Posted June 11, 2020 The dial goes from off which is at about 7 o'clock. If the tub is cool it will click on right away or close to it. When the problem began, was clicking on about 9 o'clock. ..That was at 115°. Usually all the way up it will get to about 105°. Quote Link to comment Share on other sites More sharing options...
RDspaguy Posted June 11, 2020 Report Share Posted June 11, 2020 Which could be a bad sensor (thermistor), topside, or circuit board. Gotta narrow it down. Test the sensors. Let us know. Quote Link to comment Share on other sites More sharing options...
sunken soaker Posted June 11, 2020 Author Report Share Posted June 11, 2020 Went out this afternoon and tub was about 101. Turned thermostat up slowly. Went on at about the beginning of seven. Before it would go on at about 9 o’clock. Heard this whistling where the information cable goes into the control box. It went away after a while but I shot the video while it was going. IMG_4274.MOV Quote Link to comment Share on other sites More sharing options...
RDspaguy Posted June 11, 2020 Report Share Posted June 11, 2020 Attachment not available. Open up the box. Post some pics. And test the sensors! Quote Link to comment Share on other sites More sharing options...
sunken soaker Posted June 11, 2020 Author Report Share Posted June 11, 2020 Just retested the top plug is 5.44 K. The bottom plug is 3.32 K, at 104°. I think these are the sensors right? Quote Link to comment Share on other sites More sharing options...
RDspaguy Posted June 11, 2020 Report Share Posted June 11, 2020 Yes, and those are WAY out. Get new sensors. 1 Quote Link to comment Share on other sites More sharing options...
sunken soaker Posted June 12, 2020 Author Report Share Posted June 12, 2020 Quote Link to comment Share on other sites More sharing options...
sunken soaker Posted June 12, 2020 Author Report Share Posted June 12, 2020 this is upside down Quote Link to comment Share on other sites More sharing options...
sunken soaker Posted June 12, 2020 Author Report Share Posted June 12, 2020 Turned it all the way up Left for a while and came back and was 108° Ouch!. Got in and now it's down to about 106 and I turned the dial down to seven.. where I used to set it.. will see if it regulates. Quote Link to comment Share on other sites More sharing options...
sunken soaker Posted June 12, 2020 Author Report Share Posted June 12, 2020 Temperature Terminal shows zero when it's all the way down and 120 when it kicks on. Quote Link to comment Share on other sites More sharing options...
sunken soaker Posted June 12, 2020 Author Report Share Posted June 12, 2020 Maybe it was stuck before and it isn't now? Will see if it regulates in a few hours Quote Link to comment Share on other sites More sharing options...
sunken soaker Posted June 12, 2020 Author Report Share Posted June 12, 2020 This morning was all the way down to 102. Turned the dial up to number seven. Seems like heat went on. RD Spa Guy, you said "thermistor chart should be good, but what is important is that both thermistors are within a few hundred ohms of each other. If they are not, replace BOTH. If the thermistors are good it's the topside or board. " top plug is 5.44 K. The bottom plug is 3.32 K, at 104° Isn't that 120 difference? Isn't that within the range? If not the thermistors, what part of Topside or circuit board might be?... Quote Link to comment Share on other sites More sharing options...
RDspaguy Posted June 13, 2020 Report Share Posted June 13, 2020 5.44k is 5440, 3.32k is 3320. That is WAY out, by some 2120 ohms. You have a bad sensor. Manufacturer recommends and I agree to always replace them in pairs. 2 Quote Link to comment Share on other sites More sharing options...
sunken soaker Posted June 13, 2020 Author Report Share Posted June 13, 2020 Thanks for your help I'm going to order them now. I'll let you know. Quote Link to comment Share on other sites More sharing options...
RDspaguy Posted June 13, 2020 Report Share Posted June 13, 2020 👍 Quote Link to comment Share on other sites More sharing options...
Gordy Haynes Posted January 2 Report Share Posted January 2 I would like to know how the dial works on a tiger river Manora hot tub. What do the numbers on the right side of the dial stand for? I’ve always regulated the heat on the left side. Quote Link to comment Share on other sites More sharing options...
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