Hi, Was in tub last night when both pumps stopped working. The topside control lights up but will not activate pumps. The heater also does not work (probably because the pumps don't). Could it be a relay? Picture 004.jpgPicture 001.jpg Thanks

Hi, I might have an answer for you. I have fixed a few catalina spa tubs, but am relatively new at this business. I started in 2008. I actually came here to get some technical answers, but here I am giving advice instead.
you will need a muti meter, or 110 and 220 test lights. Begin at the source. You probably have a 240 volt system which means two lines, one neutral, and a green earth ground wire. These are hooked up to a 50 amp breaker nearby, or in your basement. Check to see that both legs, or lines are getting power, and then put your meter/240 volt test light across the the two lines. You should get 240 volts.
In case you need to start from scratch. You will first need to open up the access panel which is usually below the topside keypad. The panel in those years was removed with a phillips screw gun/driver. Then you will see the control box. Follow the power cable coming from the house and you will see the white junction block where the wires hook up. Be very careful as 220 volts can kill you.
You usually can see identifying labels marked line one, line two, and neutral and ground. You should get 240 volts when you test from line one to line two.
You will get 120 volts when you test from the earth ground to line one, and from the earth ground to line two. You will also get 120 volts when you test from neutral to line one and line two.
If this test fails, your circuit breaker, or GFCI is tripped, or broken.

If you get proper voltages, look for blown fuses within the board. Turn off the power, remove the big green, or orang cylyndrical fuses and test them for continuity. If one of them is bad, look at the schematic which is located on the cover of the box, or somewhere close by, and it will tell you what that fuse is for, eg Pump one, pump two, blower etc.

You probably can buy a new fuse at menards, Lowes, or Home depot.
Next, unplug whichever motor, or component is blowing the fuse. Turn the system back on. The system should work, or at least light up.

If it is pump one, and it is burnt out, your heat won't work and you will have to get a new pump and motor before resuming. It is very unlikely that both motors went bad at the same time, but some tubs use one fuse for both motors.
Hope this helps.

I just looked at your pics. Shame on me. The system you have is different and older than the ones that I worked on. You have a GFCI built into the front. Those are notorious for failing, and you can replace it yourself cheaply. You also have a timer, and that can break too. Inside is a little clock motor that gets tired and stops. You might be able to turn it on manually.
You can see the plugs on the side of your control. You can unplug the pumps, and test for voltage right there on the side. If no voltage, you will have to start at the source as I described earlier with a multi meter and find out what is getting power and what is not. Someone else will have to help you from there.
Perhaps someone was playing with the timer and it shut you down because it was that time.