I have an aqua rite pro system with a possible burnt varistor. I know from other forums that the regular aqua rite system burns the SL322R025 thermistor and or V150LA2P varistor. My board looks different but what I think is the varistor ( little black disc ) is burnt. Wanted to replace but need to know correct part to order. Any help would be great. It’s the black disc behind R48 on circuit board
Welcome to the TechForum and thank you for posting your question. Are there any identifiable markings or numbers on either side of the part?
No there’s no visible markings
The board marking appears to designate that part as R48. Typically varistors are designated V or RV and R typically designates a resistor. So I’d guess it’s an inrush current limiting thermistor, not a varistor, and thermistors are often designated with an R.
The Ametherm SL32 2R025 Inrush Current Limiter looks very similar to the part in your photo. Since the PCB shows a 20A fuse in that area and the SL32 2R025 is a 25A rated part that might be the part. Of course getting that wrong could cause a catastrophic failure of other parts on the PCB so use my info at your own risk.
Thanks for the info