E08
Rheem
Exhaust Temperature Sensor / Flue Sensor Fault
Heater shows E08 and will not operate
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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 flue temperature sensor, Loose sensor wiring, Overheated flue due to restricted exhaust
How to Fix / Troubleshooting
Safety First: Turn off power and gas. Exhaust components may be hot.
- Inspect venting: Check the exhaust vent for obstructions, sagging sections, or improper terminations that could cause overheating. Correct any installation issues.
- Locate flue sensor: The exhaust temperature sensor is mounted in the flue collector or vent collar. Inspect the sensor and wiring for heat damage.
- Test sensor: With power off, disconnect the sensor and measure resistance. Compare to Rheem's chart. Replace if readings are out of specification.
- Replace sensor if necessary: Install a Rheem-approved flue temperature sensor, ensuring good contact and proper routing of wires away from hot surfaces.
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Repair Difficulty
Medium
3/5
Required Part
Flue Temperature Sensor
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