E07
Pentair
Stack Flue Sensor Fault / Flue Overheat
Heater shows E07 and shuts down or will not start.
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Failed stack flue temperature sensor, Restricted exhaust vent, Excessive scale in heat exchanger causing high flue temperature, Loose or corroded sensor wiring
How to Fix / Troubleshooting
Safety: Turn off power and gas. Allow the heater and vent to cool fully.
- Inspect venting: Check the vent pipe for kinks, crushed sections, or obstructions. Ensure termination is clear and installed per Pentair specifications.
- Check stack flue sensor: Locate the flue sensor on the exhaust stack. Inspect wiring and connector for corrosion or damage. Reseat the connector.
- Test sensor resistance: With power off, disconnect the sensor and measure resistance with a multimeter. Compare to Pentair’s temperature/resistance chart. Replace the sensor if readings are out of range.
- Consider heat exchanger condition: If the sensor is good and vent is clear but E07 persists, the heat exchanger may be scaled, causing excessive flue temperatures. This requires professional inspection and possible descaling or replacement.
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Repair Difficulty
Hard
4/5
Required Part
Stack Flue Temperature Sensor
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