33
Rheem
Limit or Flame Rollout Switch Open
Status LED flashes 3 short and 3 long (33); furnace may run blower only
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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
Overheating due to restricted airflow, Tripped rollout switch, Faulty limit switch, Loose wiring in safety circuit
How to Fix / Troubleshooting
Safety first: Turn off power and gas. An open rollout switch can indicate dangerous combustion problems.
- Check air filter and ducts: Replace dirty filters and ensure all supply and return ducts are open and unobstructed.
- Inspect rollout switches: Locate rollout switches near burners. If they are manual reset, press the reset button once. If they trip again, do not continue resetting.
- Examine wiring: Look for burnt or loose wires in the limit/rollout circuit. Repair any damage.
- Observe operation: After resetting and restoring power, watch the furnace start-up. If flames roll out of the burner area or you see scorching, shut down immediately and call a professional.
Never bypass rollout or limit switches; they protect against fire and carbon monoxide hazards.
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Repair Difficulty
Professional Required
5/5
Required Part
Flame Rollout Switch
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