If you’re looking for help fixing your Ruud furnace, look no further! Our comprehensive Ruud furnace repair guide will explain common issues, provide troubleshooting tips, and show you how to read your model’s error codes.

CODE: LED is steadily on
PROBLEM: Normal fault detected.

CODE: Single LED flash
PROBLEM: Failed to detect flame within three attempts for ignition, 1-hour lockout.
FIX: Reboot system.

CODE: Two LED flashes
PROBLEM: The pressure switch is stuck open or induced draft blower problem detected.
FIX: Try to manually close the switch, replace the switch, or check blowers and vents for air pressure.

CODE: Three LED flashes
PROBLEM: The limit switch is open, or the roll-out control is engaged.
FIX: Check for a restricted air vent, loose blower wheel, a defective blower, or a dirty air filter.

CODE: Four LED flashes
PROBLEM: The pressure switch is stuck closed, or the switch won’t open.
FIX: Check for an obstruction in the pressure tubing.

CODE: Five LED flashes
PROBLEM: N/A

CODE: Six LED flashes
PROBLEM: Line and Neutral are reversed.
FIX: Control board or the furnace’s ground could be defective.

ruud furnace codes

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