When turning on, the red service light came on. Whenever i turn on the heater, the heating system turns on and the service light comes on for only a few seconds before turning off. I hear the flame part (don’t know what. Jan 13, 2023 · when your pentair mastertemp 400 service heater light illuminates, it’s crucial to identify the root cause to prevent further damage and restore functionality swiftly. Mar 26, 2022 · the most typical cause of your pentair mastertemp 400, not the heating issue is a clogged swimming pool filter.
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