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2005 Hot Springs Vista rapid relay clicks, display turns on and off, endless cycle.


Lawrence M

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I tried powering off the spa, but that didn't help. I removed the filters, also no change. Lim OK LED flashes rapidly accompanied by clicking relay, then Control Disconnected LED flashes, then stops. This repeats endlessly. I measured the voltage on the white wire leading from the Relay Board to the Control Board. It has 127 v. I disconnected the  ozonator, circulation pump, and both main pumps from the board, but the same behavior (clicking and flashing) occurs. I measured the resistance of the recirculation pump and it was 40.8 ohms. The clicking appears to be coming from one of the relays behind the metal bar, but I am a bit nervous about trying to touch them because they are close to real power. I also checked the recirculation pump fuse and it is good. I could not detect any power going to the recirculation pump. I suspect that the main board is bad. I have attached a picture of the control board below. I don't see any obvious signs of damage. Is there anything else that I could try? Thanks in Advance!

spa.control.board.jpg

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On 1/15/2022 at 7:52 PM, Lawrence M said:

I tried powering off the spa, but that didn't help. I removed the filters, also no change. Lim OK LED flashes rapidly accompanied by clicking relay, then Control Disconnected LED flashes, then stops. This repeats endlessly. I measured the voltage on the white wire leading from the Relay Board to the Control Board. It has 127 v. I disconnected the  ozonator, circulation pump, and both main pumps from the board, but the same behavior (clicking and flashing) occurs. I measured the resistance of the recirculation pump and it was 40.8 ohms. The clicking appears to be coming from one of the relays behind the metal bar, but I am a bit nervous about trying to touch them because they are close to real power. I also checked the recirculation pump fuse and it is good. I could not detect any power going to the recirculation pump. I suspect that the main board is bad. I have attached a picture of the control board below. I don't see any obvious signs of damage. Is there anything else that I could try? Thanks in Advance!

spa.control.board.jpg

There are 2 cables for the light 

Turn spa off at the mains discount both cables for the light ones white the others red , turn tub back on and see what happens 

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The incoming voltage is good. I unplugged the lights, but that didn't help. I also checked the power coming from the power relay board. There is a thermistor and a limit check. I assume that the thermistor should have a resistance and the limit check should be either on or off. There is also another pair of wires going to the heater that are plugged into the board and labeled regtherm. Is that another thermistor? 

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