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If you are an owner of Ruud furnace or operate it at your work, you may encounter with Ruud furnace error codes appearing in the operation process. The tables on the page describe the codes, flashes, blinks and other problem signals and let you understand what is going on with the equipment at a certain moment.


Ruud R801T Furnace Error Code

CODE: 0.
RESULT: Standby.

CODE: C.
RESULT: Compressor on (cooling or heat-pump heat).

CODE: H.
RESULT: Gas heat on.

CODE: F.
RESULT: Continuous fan on.

CODE: 10.
RESULT: 1 hour lockout.

CODE: 11.
RESULT: Failed ignition.

CODE: 12.
RESULT: Low flame sense.

CODE: 13.
RESULT: Flame lost.

CODE: 14.
RESULT: Unexpected flame.

CODE: 20.
RESULT: Twinning fault.

CODE: 22.
RESULT: Main limit open.

CODE: 26.
RESULT: Line and neutral reversed.

CODE: 33.
RESULT: Mrlc (manual reset limit control) (aka roll-out) open.

CODE: 55.
RESULT: Pressure switch stuck closed when should be open.

CODE: 57.
RESULT: Press switch stuck open when should be closed.

CODE: 61.
RESULT: Blower fault-blower unable to run.

CODE: 93.
RESULT: Internal control fault.

Ruud U98V Furnace Error Code

FLAME LED: OFF.
RESULT: No flame is detected.

FLAME LED: Rapid blink.
RESULT: Unexpected flame.

FLAME LED: Slow blink.
RESULT: Marginal flame sense.

FLAME LED: Steady ON.
RESULT: Normal flame detected.

STATUS LED: Steady ON.
RESULT: Furnace.

STATUS LED: 1 Blink.
RESULT: Ignition failure, 1 HR lockout.
FIX: Reboot system.

STATUS LED: 2 Blinks.
RESULT: Pressure switch stuck open, switch will not close when inducer is on.
FIX: Try to manually close the switch, replace the switch, or check blowers and vents for air pressure.

STATUS LED: 3 Blinks.
RESULT: Limit switch open, main limit or roll out control
FIX: Check for a restricted air vent, loose blower wheel, a defective blower, or a dirty air filter.

STATUS LED: 4 Blinks.
RESULT: Pressure switch stuck closed, switch will not open.
FIX: Check for an obstruction in the pressure tubing.

STATUS LED: 5 Blinks.
RESULT: Not applicable.

STATUS LED: 6 Blinks.
RESULT: Line and neutral reversed.
FIX: Control board or the furnace's ground could be defective.

POWER LED: OFF.
RESULT: No power (24 VAC) to control board.

POWER LED: ON.
RESULT: Control is powered.

Ruud R802P Furnace Error Code

FLAME LED: OFF.
RESULT: No flame is detected.

FLAME LED: Rapid Blink.
RESULT: Unexpected Flame.

FLAME LED: Slow Blink.
RESULT: Marginal Flame Sense.

FLAME LED: Steady ON.
RESULT: Normal Flame Detected.

STATUS LED: Steady ON.
RESULT: Normal Fault detected.

STATUS LED: 1 Blink.
RESULT: Ignition failure, 1 HR lockout.

STATUS LED: 2 Blinks.
RESULT: Pressure switch stuck open switch will not close when inducer is on.

STATUS LED: 3 Blinks.
RESULT: Limit switch open main limit or roll-out control.

STATUS LED: 4 Blinks.
RESULT: Pressure switch stuck closed. Switch will not open.

STATUS LED: 5 Blinks.
RESULT: Not applicable.

STATUS LED: 6 Blinks.
RESULT: Line and Neutral reversed.

POWER LED: OFF.
RESULT: No power (24VAC) to control board.

POWER LED: ON.
RESULT: Control is powered.

Ruud R96P Furnace Error Code

GREEN LED: ON.
RESULT: Normal operation.

GREEN LED: 1 Flash.
RESULT: Ignition failure (4 trials).

GREEN LED: 2 Flashes.
RESULT: Pressure switch stuck open.

GREEN LED: 3 Flashes.
RESULT: Limit switches open.

GREEN LED: 4 Flashes.
RESULT: Pressure switch stuck closed.

GREEN LED: 5 Flashes.
RESULT: Twin fault.

GREEN LED: 6 Flashes.
RESULT: Brownout voltage.

GREEN LED: 7 Flashes.
RESULT: Hot and neutral reversed or no ground.

GREEN LED: Continuous.
RESULT: Gas valve relay short.

YELLOW LED: Rapid Blink.
RESULT: Flame out of sequence.

YELLOW LED: Slow Blink.
RESULT: Low flame or no flame.

YELLOW LED: ON.
RESULT: Flame present.


See What Our Customers Are Saying:

by Brent L on Twintech Heating and Cooling

Work was done on schedule, professionally, according to quote and with minimal inconvenience to building users. Very happy with the end result. The only area for improvement from my experience - need more timely quoting process.

by Karen on Twintech Heating and Cooling

The team was great! Very knowledgeable, professional and extremely helpful. A few days after install the unit didn’t seem to be working, user error, but within minutes of contacting them..on a Saturday.. a tech was on the phone troubleshooting with us. I highly recommend Twintech for your cooling or heating needs. They stand by their products and a pleasure to deal with.

by Rob on Twintech Heating and Cooling

During the hottest week in the summer our old A/C decided to call it quits. I called Twintech Heating & Cooling after receiving a referral from a family member; came highly rated for being an honest, family-run business, who appreciates their customers. Dave was able to accommodate my hectic schedule and book a late evening appointment to walk through the specifics. Greg and Mitch arrived exactly on time a few days later, were very polite and friendly, and within a couple of hours had a new unit up and running. I also received a follow-up call to ensure we were happy with the Amana.

by Linda Robinson on Twintech Heating and Cooling

They were on time and very professional. I'm so glad I decided to go with Twintech, thanks!

by Famcam1953 on Twintech Heating and Cooling

Timely and appreciated - this was during the hottest days this year when our Air and Furnace way.
Efficient. Professional. No BS or overselling. What was promised, was delivered at a cost-effective price point.
Down to earth.

by DG Sellers on Twintech Heating and Cooling

Professionally done and took care to cover all entry floors to the house for the installers to remove the old furnace and install a new furnace.
I also made recommendations of the tankless water heater that we had installed and items to address. We did not know they also installed tankless water heaters.

by Bill, Pickering on Twintech Heating and Cooling

Price was not the cheapest nor the most expensive of my quotes. It's the quality of the installation that makes for a good AC system. The twins' knowledge & professionalism was evident in the small details:
Very clean work. Greg made sure that the refrigerant level & temperature were correct. They reinstall the insulation & vapor barrier around the wall. The outside electrical cords were secured to the wall. Proud to support this local company. Thank you.

by Taz on Twintech Heating and Cooling

Great team of guys came to do the work. Very professional. Arrived on time worked very efficiently and were very clean. They answered any questions we had without hesitation. The air conditioner works great and is so quiet. I highly recommend them and they don't try to up-sell anything right from the start.

by Jordan on Twintech Heating and Cooling

The service was prompt, professional and very courteous. Competitive price. Would highly recommend this company.

by David on Twintech Heating and Cooling

Excellent workmanship, and quick response. Would recommend Twintech to anyone.