How to Troubleshoot D9 and D10 Lights on the 77119 Heater Relay Board: 01-09 Hot Spring Tiger River

[@ejbradford595]

Bought a new heater relay board that looks burned, found this from your link to modify the heat shield. After installing new board, still no lights on anything. I have no d9-d10 or any led lights on main board either? All new wiring and breakers. Any clue? Thank you for this video too!

[@backyardplus]

If you have good voltage coming into your IQ2020 control box but no lights on the main board, it means you have a dead board. You must replace the main board and topside control panel at the same time.

[@arockingroupie]

Hello I just changed the motherboard and relay board. We got the hottub to 100+ degrees for a few days and now it wont go past 90 and the D10 light isnt on. Do I need a new control panel? Some places are saying a new heater

[@backyardplus]

First check the voltage between H1 and H2. If you have good voltage, your control panel is fine. Make sure the HTR ON light is solid red on the motherboard before check voltage at H1 and H2.

[@backyardplus]

If your heater is getting good voltage and your spa isn't heating up to the set temperature, its probably a bad heater. Is the green ready light or red power light flashing? If you have good voltage going to the heater, check the amperage with amp clamp around the hot wire of heater. 25 amps for 6kW, 17 amps for 4kW. Any low amperage reading indicates a bad heater.

[@JoeyDee1115]

Hi I reached out on your past video about troubleshooting how to fix a blinking red light. After calling and talking to a specialist, they had me order a new motherboard and control head. I installed both parts and my hot tub still has a blinking red light. The only light on the main motherboard is D17. Is there anything else that could be causing this issue and not allowing the heater to kick on?

[@backyardplus]

Hey Joe! Try getting rid of any airlock. Here is the link to the airlock video I made. backyardplus.com/blog/videos/are-your-power-and-ready-lights-flashing-how-to-fix-an-airlock-in-a-hot-tub-hot-spring-and-tiger-river-spa/