n-mod Posted December 11, 2020 Report Share Posted December 11, 2020 After fixing some issues with my heater, I'm now getting D9 flashing on my heater relay board. Any ideas how to fix this? It does it even with the heater disconnected. Quote Link to comment Share on other sites More sharing options...
n-mod Posted December 11, 2020 Author Report Share Posted December 11, 2020 I pulled out my old burned relay board, hacked it together, and it's working good. So it must be the relay board. This is the newer board 77119. Any ideas what could have failed? I hate spending another $150 on one. Quote Link to comment Share on other sites More sharing options...
n-mod Posted December 11, 2020 Author Report Share Posted December 11, 2020 The board is set to 12v. I see other instructions saying to set it to 18v. What is this jumper for and could that have caused my issue? Quote Link to comment Share on other sites More sharing options...
RDspaguy Posted December 12, 2020 Report Share Posted December 12, 2020 I read a thread about this not long ago. Have you searched the topic? As I recall it is small component on the board, and there is also an issue with the 3 metal prongs touching the mounting bracket on the right of the relay board. Quote Link to comment Share on other sites More sharing options...
RDspaguy Posted December 12, 2020 Report Share Posted December 12, 2020 https://www.poolspaforum.com/forum/index.php?/topic/47307-77119-heater-relay-board-multiple-failures/&tab=comments#comment-182272 Quote Link to comment Share on other sites More sharing options...
n-mod Posted December 12, 2020 Author Report Share Posted December 12, 2020 After a long time researching I found this thread with a post from NotaFanofWatkin, that describes the issue very well and a way to bypass the failed chip. I got it working with 120v, but don't have a reliable 220v connection until I move the spa to my deck. If this doesn't work, I'm going back to the old style heater board and upgrading the relays. Thread "77119 Heater Relay Board Multiple Failures" Quote Link to comment Share on other sites More sharing options...
n-mod Posted December 12, 2020 Author Report Share Posted December 12, 2020 Here is a link to the thread. It won't let me embed it. I believe I killed my board by power cycling too quick while testing the heater. https://www.poolspaforum.com/forum/index.php?/topic/47307-77119-heater-relay-board-multiple-failures/&tab=comments#comment-199573 Quote Link to comment Share on other sites More sharing options...
RDspaguy Posted December 12, 2020 Report Share Posted December 12, 2020 The 18v option is for "old style" main boards, the 12v is for new. If it is you original main board you need to be in 18v. Yep, same one I just linked a minute ago. Quote Link to comment Share on other sites More sharing options...
n-mod Posted December 12, 2020 Author Report Share Posted December 12, 2020 Is there a way to tell if my board is new or old style? It says to read instructions on the board, but the instructions don't say anything about the jumper. My mainboard has been replaced at some point. Quote Link to comment Share on other sites More sharing options...
RDspaguy Posted December 12, 2020 Report Share Posted December 12, 2020 @castletonia, can you tell us how to determine board voltage without a tester? Quote Link to comment Share on other sites More sharing options...
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