Artesian La Paz - 3 flashing lights

[mdex]

Hi,

We have just bought and moved into a new house and the previous owners left behind an Artesian La Paz Hot Tub. I appreciate this is quite an old model but on the face of it looks it pretty good condition. The issue is the hot tub is regularly producing a 3 flashing lights error at which point it refuses to heat until I 'reset' it.

I have done a fair bit of reading and some of my own troubleshooting but I hope someone more experience can please help me diagnose the problem from my symptoms.

The display we have is a Spa Builders branded version of this which I have found to be a Gecko TSC-9.

This is an image of the circuit board.

 

At first glance the hot tub heats, and pumps without any issue. Once set temp is reached here is when the issues start.

If I try and turn the jets on stage 1 (Pressing Pump button once) I get a hum from the pump but no water flow, and then 3 red lights. If I press the Pump button again for stage 2 then the jets work full power. After pressing Pump again to turn the jets off the 3 red lights disappear.

If instead of turning the jets on I try and up the heat I get the same hum from the pump and 3 red lights, if I reduce demand for heat again then hum stops and 3 red lights disappear.

I have drained, cleaned, and refilled (sticking the hose down the filter hole) to reduce the chances of air locks. I have also run without the filter and get the same issue. 

Here is a video of what I describe above. (May still be processing if you read this post quickly)

https://youtu.be/ti39bwu0n38

Thanks so much in advance for any assistance.

[mdex]

In case anyone see this in future and has a similar fault it was the low speed capacitor in the pump. 16uf.

Got some advice elsewhere, replaced it and all working ok.