What It Means
Flame signal lost after successful ignition.
Rheem Furnace
Rheem Furnace Error Code 13
Troubleshooting guide for the Rheem Furnace system fault 13.
Possible Causes
- Intermittent gas supply.
- Unstable flame or dirty flame sensor.
- Venting, draft, or condensate issue.
- Poor burner grounding.
Not sure which one it is — or if it's none of these? Try ACLogics today.
Disclaimer: This information is for general reference. Error codes can vary by model and production year. Always refer to your machine's specific manual and the information printed on the unit itself.
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Full Diagnosis
Flame lost after flame was established.
All Recorded Causes
Intermittent gas supply, unstable flame, dirty flame sensor, venting/draft issue, condensate or pressure-switch issue, or poor burner grounding.
Verify Before Replacing Parts
- Confirm the exact Rheem model family and furnaces context before acting on a generic code description.
- Walk the entire heating sequence in order instead of jumping straight to the reported code, watching for intermittent gas supply, unstable flame, dirty flame sensor, venting/draft issue, condensa….
- Verify each safety device and prove where the sequence stops under live operation, including whether the next candidate on the list.
- After the correction, run the system long enough to confirm the furnaces fault does not return under normal load.
Still unsure about this fault?
ACLogics walks you through Rheem Furnace diagnostics step-by-step — so you confirm the cause before swapping parts.
