System Diagnosis
Low flame sense; weak flame current detected.
Rheem Furnaces
Error Code 12
Troubleshooting guide for the Rheem Furnaces system fault 12.
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.
Potential Causes & Solutions
- Dirty flame sensor rod, poor flame sensor grounding, weak flame, incorrect flame sensor position, or wiring/control issue.
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.
- Verify each safety device and prove where the sequence stops under live operation.
- After the correction, run the system long enough to confirm the code does not return under normal load.
Field Signals to Confirm
What usually confirms it
A repeatable stop in the heating sequence at the same safety or prove step.
What can fool you
Weak grounding, marginal flame signal, or venting issues can produce inconsistent code behavior.
When to Escalate the Call
- Safety devices keep opening after the obvious mechanical causes are corrected.
- Combustion, venting, or gas input needs a higher-confidence review.
Still unsure about this fault?
ACLogics walks you through Rheem Furnaces diagnostics step-by-step — so you confirm the cause before swapping parts.
