HARD LOCKOUT
Ruud
Hard Lockout Due to Repeated Ignition or Safety Failures
Control board indicates hard lockout (may show solid LED or specific pattern), furnace will not attempt to start until power is cycled.
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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
Multiple failed ignition attempts, Repeated limit or rollout trips, Control board internal fault, Gas valve or ignition system failure
How to Fix / Troubleshooting
Safety: Determine why the furnace locked out before repeatedly resetting. Frequent lockouts indicate a serious problem.
Steps to check:
- Power reset: Turn off power to the furnace for at least 5 minutes, then restore. Observe the LED code and ignition sequence.
- Review recent codes: Many Ruud boards flash the last fault code before lockout. Note the pattern and refer to the code list to identify the underlying issue (pressure switch, limit, flame sense, etc.).
- Address root cause: Follow the appropriate troubleshooting steps for the last stored code (e.g., clean flame sensor, replace filter, clear vent).
- Call technician if lockout returns: If the furnace returns to hard lockout after a reset, contact a qualified HVAC technician for full diagnostics.
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Repair Difficulty
Hard
4/5
Required Part
Integrated Furnace Control Board
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