The Pentair 461105 is the OEM Control Board Kit for the MasterTemp and Max-E-Therm pool and spa heaters (125, 250, and 400) — Natural Gas (NA) and Liquid Propane (LP) versions. This kit replaces the PCBA and membrane keypad as a matched assembly, restoring full heater control and automation connectivity. Note, this product has been succeeded by the 466105Z (interchangeable per Pentair service support). ⚠️ IMPORTANT: KIT LISTING — MULTIPLE COMPONENTS INCLUDEDThis listing is a kit, not an individual board or keypad. It includes the PCBA, 6-button membrane pad, RS485 assembly, and installation instructions — all required for a complete control board replacement. ⚠️ IMPORTANT: LICENSED PROFESSIONAL INSTALLATION REQUIREDGas and high-voltage electrical heater components must be serviced by a licensed pool professional or qualified HVAC technician. Do not attempt to service gas or high-voltage components without proper certification. The PCBA is the primary control module for the heater — managing ignition sequencing, temperature regulation, and RS485 communication with automation systems such as IntelliTouch and EasyTouch. When the control board fails, common symptoms include no-start conditions, persistent fault codes on the display, and loss of automation connectivity. Replacing the PCBA and membrane keypad together as a matched kit ensures consistent electrical contacts between the board and the keypad buttons, avoiding intermittent input failures that can result from mixing components across service intervals. Specifications Pentair Part Number 461105 Part Type Control Board Kit — PCBA + Membrane Pad Fuel Compatibility Natural Gas (NA) and Liquid Propane (LP) Quantity Included Kit (PCBA, 6-Button Membrane Pad, RS485 Assembly, Installation Instructions) Also Included In Pentair Heater Master Kit — All (461100) Fits Into Brand Equipment Line Model / Part Number Notes Pentair MasterTemp 125 Heater MT125 / MasterTemp125 NA and LP Series Pentair Max-E-Therm 125 Heater MAX-E-THERM (125K BTU) NA and LP Series Pentair MasterTemp 250 Heater MT250 / MasterTemp 250 NA and LP Series Pentair Max-E-Therm 250 Heater MAX-E-THERM (250K BTU) NA and LP Series Pentair MasterTemp 400 Heater MT400 / MasterTemp 400 NA and LP Series Pentair Max-E-Therm 400 Heater MAX-E-THERM (400K BTU) NA and LP Series 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, confirm the part number currently installed in your heater — the control board is typically labeled on the board itself or referenced in your heater's service manual. When installing the new board, note the orientation of all wire harness connections before disconnecting them, as the RS485 and ignition harnesses can be easy to reverse on reassembly. This kit is also a component of the master service kit (461100) — if your heater requires multiple component replacements in the same service call, the master kit may be more cost-effective. Installation Guide Here is the installation guide for the Control Board. Note, installation must be performed by a licensed pool professional or HVAC service expert.
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