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How to fix a MasterTemp Pool Heater Stack Flue Sensor (SFS) Error Mastertemp 400 Heat Exchanger

Last updated: Sunday, December 28, 2025

How to fix a MasterTemp Pool Heater Stack Flue Sensor (SFS) Error Mastertemp 400 Heat Exchanger
How to fix a MasterTemp Pool Heater Stack Flue Sensor (SFS) Error Mastertemp 400 Heat Exchanger

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