The Pentair Motherboard With 4 Aux Pool/Spa Combo (520659) is the OEM replacement control board for the EasyTouch pool and spa automation system, restoring full system control when the central processing board fails.
IMPORTANT: LICENSED PROFESSIONAL INSTALLATION REQUIRED
This motherboard operates at mains voltage (120V/240V). Installation or replacement must be performed by a qualified electrician or certified pool technician. Do not attempt to install this component without proper certification and training.
IMPORTANT: CONFIRM YOUR AUXILIARY COUNT BEFORE ORDERING
This is the 4-auxiliary version of the EasyTouch motherboard. EasyTouch systems are available in multiple configurations with different auxiliary counts. Verify that your existing system uses the 4-auxiliary version by checking the part number printed on your current motherboard or your EasyTouch control panel documentation before ordering.
This motherboard is the central processing board of the EasyTouch automation system, governing communication between the control panel, load center, and connected pool and spa equipment. When this board fails, the EasyTouch system loses the ability to control pumps, heaters, lighting, and auxiliary equipment. Replacing it with this OEM Pentair board restores full system function. This version is configured for pool/spa combo systems with 4 auxiliary outputs.
Specifications
| Pentair Part Number | 520659 |
| Motherboard With 4 Aux Pool/Spa Combo | |
| Quantity Included | Each |
Fits Into
| Brand | Equipment Line | Model / Part Number | Notes |
| Pentair | EasyTouch Control System | EASYTOUCH | 4-auxiliary pool/spa combo configuration. Confirm auxiliary count on existing board before ordering. |
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 will be marked on the PCB itself or on a label affixed to the board. Confirm that your current board shows 520659. If your board shows a different part number, your system may have a different auxiliary configuration (such as the 8-auxiliary variant) and will require a different replacement board. As a precaution, photograph your existing wiring harness connections before the board is removed this reference documentation will assist your technician during reinstallation.
