Problem with Sn, Dr and Dy

[stepas]

Hello,
Im new here and expecting some help with jacuzzi.
I got jacuzzi with house and now trying to fix it. After turning power on we got “Pr” code(prime i think so) after pr code we getting Sn code after few time all pumps turning off and we getting Dr code, after while Dr code we got dy code. We changed temp sensors in balboa heater from completly working jacuzzi and new circulation pump. Maybe someone got problem like this or was fixing this things for someone? Help me please

 

[ajw22]

Welcome to TFP.

Maybe @RDspaguy knows what those codes mean.

 

[RDspaguy]

Post pics of circuit board, wiring diagram, and equipment area.

 

[stepas]

 

[stepas]

Post pics of circuit board, wiring diagram, and equipment area.

We have changed circulation pump with temp sensors which dont help us. And after that we changed main board from other spa. But now what we have is LF error code and i dont get it where is the problem…

 

[RDspaguy]

You can't necessarily just swap out boards. Different models have different functions, compatible topside controllers, and programming.
Again, to help you I need to see the wiring diagram on the cover of the box that board came from. It should show the dipswitch configurations for that board, which are needed to program it.
This system uses the two temp sensors for both temp control and flow detection. So Fl, dr, sn, oh, and probably a few more are all triggered by various temp sensor readings. Faulty sensors (out by even a few hundred ohms) can trigger all kinds of errors. For example, a rapidly increasing temp on both will trigger a FL and OH, but no increase will trigger a dr. Also these sensors are directional, so sensor A should be where water enters the heater tube and B where it leaves.
I can't help but notice the excessive rust on the transformer. Voltage problems can cause random error codes.