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How to Test: If you suspect the thermal regulator to be faulty simply place the thermal regulator in water heated to at least 130 degrees Fahrenheit. The regulator should open.
Compatible With: Pentair Mastertemp 400 parts, SR333NA, Mastertemp 300, SR200NA, Mastertemp 200 and Pentair Mastertemp 125 Low Nox Pool Heater. This includes all HD heaters as well.
How to Fix: If the thermal regulator does not open during the testing stage, replace the thermal regulator. If it is found that the thermal regulator IS working then proceed to Internal Bypass
Location: The thermal regulator is located between the inlet and outlet water connections on the water manifold. This is true for all Pentair Mastertemp parts
Includes: This kit for the Pentair thermal regulator max valve includes a clip, spring, thermal regulator and plug. Everything you would need to replace the thermal regulator
Swimables Heater Repair Kit for Pentair Mastertemp and Starite Max-E-Therm Pool and Spa Heater - Mega Bundle Includes - Thermistor 42001-0053S, Stack Flue Sensor 42002-0024S, HLS 42001-0063S, AGS 42002-0025S, Igniter 77707-0054, Thermal Regulator 77707-0010, Control Board 42002-0007s, Membrane Pad 42002-0029Z/472610Z, Manifold Oring Set 77707-0120, Bypass Valve 77707-0001, and Air Flow Switch 42001-0061S. Mega Bundle - The perfect Pentair Mastertemp parts list designed to fix most problems within the Pentair Pool Heater. This Pentair Mastertemp 400 parts bundle is designed for the pool professional or the homeowner. Compatibility: This pressure switch is compatible with all BTU's of the Pentair Mastertemp heater parts and Mastertemp 400 parts. It will also work with HD Versions of the heater as well. Affordable: Unlike the OEM, this parts list is the most affordable Master Temp 400 and Sta Rite Repair Kit on the market. Compatible with all Pentair Pool Heater parts. Kit Includes: Thermistor, Stack Flue Sensor, High Limit Switch, AGS, Igniter , Thermal Regulator Kit, Control Board, Membrane Pad, Manifold Oring Set , Bypass Valve, and Air Flow Switch. Best Value - This one purchase can ensure that your Pentair Pool Heaters and Starite Pool Heater will work for years to come. The kit contains enough replacement parts to fix various different issues.