Pentair MiniMax 115 Degree F Hi-Limit Thermostat | 471587
Pentair
SKU: 471587
Pentair MiniMax NT High Limit Thermostat / Hi-Limit Sensor, 115°F (Auto Reset) | 471587
The Pentair 471587 is an OEM 115°F high limit thermostat (hi-limit sensor) used on select Pentair/Sta-Rite gas pool and spa heaters. This auto-reset safety switch helps protect the heater by interrupting operation if internal water temperature reaches an unsafe level. Replace it if your heater is shutting down on high limit, showing hi-limit fault symptoms, or if the original sensor is corroded, out of calibration, or physically damaged.
Key Features
- Safety high-limit protection: helps prevent overheating by opening the safety circuit at approximately 115°F.
- Auto-reset style: restores once temperatures return to normal (heater-dependent behavior and conditions).
- OEM Pentair replacement: correct fit and electrical characteristics for compatible heater control systems.
- Common service item: frequently replaced during heater troubleshooting and rebuilds.
Common Compatibility
- Pentair MiniMax NT heaters (200, 250, 300, 400 models) where parts diagram specifies 471587
- Select MiniMax heater variants including Low NOx / TSI / LN configurations where specified
Tip: Many heaters use more than one limit switch (often a 115°F and a higher-limit switch). Match the temperature rating and part number on your heater’s parts diagram.
Specifications
- Brand: Pentair
- Part Number: 471587
- Part Type: High limit thermostat / hi-limit sensor
- Trip Rating: 115°F
- Reset: Auto reset
- Quantity: Sold individually
Common Symptoms of a Failing High Limit
- Heater starts then shuts down and indicates a high-limit condition
- Intermittent shutdowns that return after cooling
- Corroded terminals, brittle wiring, or damaged sensor body
- Nuisance trips after confirming water flow and filtration are normal
Installation Notes
- Turn off power to the heater at the breaker before servicing.
- Allow the heater to cool completely before removing sensors.
- Transfer wires one at a time to the new switch to avoid miswiring.
- If the heater continues to trip the high limit, verify circulation first (dirty filter, closed valves, low pump speed, air in system) before assuming the new part is defective.
Related Products
- Search Aqua Pool Supply for 471587
- Pentair MiniMax NT heater parts
- 150°F high limit switches
- Heater thermistors / temperature sensors
- Heater pressure switches
- Heater gaskets & seals
Maintenance Tips
- Most high-limit trips are caused by low water flow—keep baskets and filter clean and confirm valves are fully open.
- For variable-speed pumps, ensure the heater’s “heating speed” provides adequate flow when the heater is enabled.
- Maintain balanced water chemistry to reduce scale buildup inside the heater that can create hot spots and nuisance trips.
- Inspect heater wiring connections seasonally for corrosion and tighten loose spade terminals as needed.
Questions about returns? View our return policy.
Hours Of Operation:
Monday - Friday: 7:00 am to 5:00 pm Phoenix Time
Saturday: 8:00 am to 2:00 pm
Sunday: Closed
- We do not ship on Saturday or Sunday.
- Orders totaling more than $300 will require signature confirmation upon delivery.
- We process and prepare orders for shipment within 1 business day. Please note that many other pool supply retailers require 3–5 days of handling time before shipping.
- Orders placed after 1:00 pm Phoenix Time may not be eligible for same-day shipment.
- Expedited shipping options are available at checkout.
Return Policy:
- Products that are received damaged will receive a refund in store credit.
- Most products are eligible for return within 30 days of receipt, except where noted below.
- To initiate a return, please complete an RMA form prior to sending your item back.
- Original shipping costs are non-refundable and will be deducted from the return credit.
- Items returned missing accessories or original packaging, or that are not in the same condition as received, may be subject to a restocking fee of up to 100% depending on the condition of the item upon return.
- Some returns will be charged an automatic 15% restocking fee.
- We are unable to issue refunds for items that have been damaged or rendered inoperable due to installer error.
- Please complete the return form to receive your RMA number and return shipping label.
- Chemical products are not eligible for return under any circumstances.
- The Pentair Colorsync 618031 is not eligible for return.
- Pool cleaners are not eligible for return.
- Opened seals and o-rings are not eligible for return.
- Capacitors are not eligible for return.
- Plastic popup tools are not eligible for return.
- Automation components and circuit boards are not eligible for return.
- If a light is returned due to a reported malfunction and is found to be fully operational upon testing, return shipping costs and a restocking fee will be deducted from the refund.
- Orders refused at the time of delivery will be subject to the original shipping costs being deducted from the refund.
Related Products
