Sterilight errors and fault codes

What does your Sterilight UV ballast fault code mean? Well, unless it’s one of the following it’s likely that you’re reading the display upside down (Yes this happens) and that LEE is actually 337 days left on your countdown. These methods are still true for Viqua fault codes as well so if you see the A3 fault on a Viqua controller then carry on.

Sterilight UV A3

The Sterilight UV A3 fault means that your UV lamp’s 1-year lifespan has been spent. You will need to order a new lamp and reset the controller to fix this code.

Sterilight UV A2 –level alternating

Your UV lamps output has dropped below 50%. You will either need to clean your quartz sleeve with an acid-based product, clean the sensor head or clean the window the sensor looks into. If all this fails, you will need to replace the lamp. You need a UV sensor on your unit to see the Sterilight UV A2 fault code.

Low UV level

This is limited to the fancier controllers that have a different display. Either your unit is not powerful enough to treat the quality of the water running through it or once again, your quartz and sensor peripherals need cleaning. Water quality may need a test or re-test to come to a conclusion on this. We usually find this happens the most when people go for a smaller unit than they need trying to save money, only to fail their water test later.

Blank LED display

So, you’ve switched your Sterilight UV controller off and back on again and the display is still blank. Fear not, the most likely reason is that you have a faulty lamp and that it needs replacing. Please make sure your unit is plugged in and that it has power going to it though. On very rare occasions, the internal fuse may have blown on your controller. This is not replaceable, and you will need a whole new ballast if that’s the case. You’re roughly talking about 1 in 100000 for that though!

I can assure you, these are the only fault codes Viqua and Sterilight UV units are programmed to show. You can ring me up and talk about how your one is not on this list, but I will debunk your different fault code theory and tell you your controller is broken. Feel free to get in touch if you’re unsure