Pentair 140 Degree Taped Automatic Gas Shut-Off Switch for Heater Electrical System 42002-0025S
$99.99
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Pentair 140 Degree Taped Automatic Gas Shut-Off Switch for Heater Electrical System 42002-0025S
$99.99
It serves as a critical safety component designed to prevent the system from overheating by cutting off the gas supply if the water temperature within the heater header exceeds 140°F (60°C).
Product Details & Compatibility
- Equipment Compatibility: Fully compatible with standard Pentair MasterTemp and Sta-Rite Max-E-Therm pool and spa heaters (including models 175, 200, 250, 300, 333, and 400).
- Location:It is threaded into the indoor/outdoor header assembly where water enters and exits the heater's heat exchanger coils.
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Alternate Part Numbers: You may also see it cross-referenced as
42001-0064S,420020025S, orSTA-151-6230.
Troubleshooting Signs
If this switch fails or triggers defensively, you will typically see the "AGS" service LED illuminate on your heater's main electrical back-board, causing the system to lock out and stop heating to ensure safety. Common causes for it tripping include a genuine low water flow/overheating issue, bypassing too much water around the heater, or internal corrosion within the switch element itself.