The Pentair EasyTouch UOC Motherboard (520657) is the OEM replacement circuit board for EasyTouch automation systems configured with 8 auxiliary outputs in a pool/spa combo setup. If your EasyTouch system is unresponsive, displaying persistent error codes, or intermittently failing to trigger relays, this board is the direct replacement for the main logic board inside your EasyTouch load center. ⚠️ IMPORTANT: HIGH-VOLTAGE INSTALLATION ENVIRONMENT This motherboard is installed inside an automation load center that contains high-voltage wiring (120V/240V). Disconnect all power before servicing and follow applicable local electrical codes. Electrical control components must be installed or replaced by a qualified electrician or certified pool technician. The 520657 serves as the central logic board of the EasyTouch 8 automation system, managing communication between all connected equipment — pumps, heaters, lights, valve actuators, and auxiliary loads. The board features rear-facing low-voltage connectors for sensors and accessories, and an LCD diagnostic display on the front panel for local status readout. Confirm your existing board's part number before ordering — EasyTouch motherboards are model-specific and are not interchangeable across different aux-count configurations. Specifications Pentair Part Number 520657 Part Name Motherboard With 8 Aux Pool/Spa Combo Part Category Circuit Boards — Automation & Controls Auxiliary Outputs 8 Configuration Pool/Spa Combo Quantity Included 1 (Each) Fits Into Brand Equipment Line Model / Part Number Notes Pentair EasyTouch Control System — EasyTouch Series EASYTOUCH 8 Aux Pool/Spa Combo configuration only Compatibility is based on Pentair parts documentation and available OEM records. This is not an exhaustive list. For certainty, verify the part number in your equipment's manual or on the original part itself before ordering. Pro Tip Before ordering, locate the part number printed directly on your existing motherboard — it is stamped on the PCB itself. EasyTouch boards differ by aux count (4 vs. 8) and by pool-only vs. pool/spa configuration; ordering the wrong variant will result in a non-functional replacement. If your board shows a different part number, search that number on Poolaroo.com to find your correct replacement. ---
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