The Pentair 474367Z is the OEM replacement high limit switch for the MasterTemp 125 pool and spa heater.
⚠️ IMPORTANT: LICENSED PROFESSIONAL INSTALLATION REQUIRED
Gas and 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 high limit switch is a safety-critical thermal protection component within the MasterTemp 125 heater. It monitors water temperature and shuts the heater down if an unsafe temperature threshold is reached, protecting the heat exchanger and connected plumbing from thermal damage. A failed high limit switch may cause nuisance shutdowns, prevent the heater from firing, or — if the switch has failed in the closed position — allow the heater to operate beyond safe temperature limits.
Specifications
| Pentair Part Number |
474367Z |
| Component Type |
High Limit Switch |
| Quantity Included |
1 |
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 original high limit switch inside your MasterTemp 125 and confirm the part number stamped or printed on the component body matches 474367Z. Multiple thermal protection components are used in Pentair heaters and they are not interchangeable — ordering by the number on the original part is the most reliable way to ensure correct replacement.
