RC-COLORADO Posted September 30, 2022 Report Share Posted September 30, 2022 Good afternoon! We have a 2004 Sundance Bahia Spa, 240v/60amp 3-wire hot tub. I had a licensed electrician test the 240v components, pumps, heater. Two weeks ago the spa lost water temp (62°F) and showed an OH code with a temp of 109° F. We replaced the temp sensor and the display now flashes an overheat (OH) condition and reads 118°F. Both main pumps work on demand as does the circulation pump. We tested the flow switch by jumping the circuit at the pins on the control board and got a FL code. We jumped the lead at the CB pins for the high temp sensor on the heater and got the proper code when disconnected. The circuit board PN is 6600-288 REV A. Available CB's now cross to a 6600-726. Any suggestions would be extremely appreciated. Quote Link to comment Share on other sites More sharing options...
CanadianSpaTech Posted September 30, 2022 Report Share Posted September 30, 2022 How did you join the new sensor to the circuit board? Did you attach it directly to the connector that plugs onto the board or did you splice the old and new wires together? OHMs test the 2 sensors and make sure they are in range of each other. One is old one is new and if they are not within spec you might have issue. Quote Link to comment Share on other sites More sharing options...
RC-COLORADO Posted October 1, 2022 Author Report Share Posted October 1, 2022 Spliced the new sensor into the original 8" lead that came with the spa, We did do a continuity check with an ohm meter before using the old lead. The new sensor did not come with the appropriate lead. I will do an ohm's check and post the results. Thank you! Quote Link to comment Share on other sites More sharing options...
CanadianSpaTech Posted October 1, 2022 Report Share Posted October 1, 2022 @RC-COLORADO Have one I am working on now with similar issues. The Jacuzzi pack was a 1-2 year only pack with a special DSMT connector (see below) to the side of the pack. Tried to splice one in that I had on the truck but came out with a similar result. Had to order the exact part. At this point I have just connected the new one to the pack and hung it over the side of the spa into the water and have not installed it permanently. Seemed to be working without error. Going to let it run for the weekend and see if it runs. https://spaandpoolstore.com/6600-181-j-400-lcd-temperature-sensor-2010/ Quote Link to comment Share on other sites More sharing options...
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