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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 Robert, Pickering on Twintech Heating and Cooling

Had new furnace installed and ran into some difficulties but the contractor responded in a timely and efficient manner - after further service calls were made, a reasonable resolution was found.

by Brian Burns, Whitby on Twintech Heating and Cooling

The work was done quickly efficiently neatly and professionally. Pleased with the service, information, product, and the company.

by Geoff, Port Perry on Twintech Heating and Cooling

Great sales member named Dave came in told us some amazing items and how they would be priced installed an all. We couldn’t believe it! The next day the ac was installed, that day one employee named Greg told us that our furnace was working way to hard and was causing us to use way too much gas. So two days later they came in an installed a new furnace!

by MB, Ajax on Twintech Heating and Cooling

Installation was done quickly and professionally. The new furnace is quiet and provides even heat.

by Richard from Oshawa on Twintech Heating and Cooling

They removed and discarded old furnace. Installed new furnace. Installed air intake pipe, that had never been installed by builder, no charge. Replaced loose hose on floor with hard pipe and rerouted it to drain, no charge. Almost 33% cheaper then quote from Enercare, which was the company we dealt with and had insurance with for 8 years. No yearly fee for cleaning/insurance, saves 300 a year. Courteous, professional, fast, and friendly. My wife and I have been recommending them to everyone we know and meet, and will continue to do so. Thanks for everything, Twintech!!!

by Darcy from Pickering on Twintech Heating and Cooling

This company was great to deal with. Our furnace went down and they installed a new furnace the next day with a lot of professionalism!

by gillian hooton from Uxbridge on Twintech Heating and Cooling

Finally! An honest company with highly knowledgeable and informative staff. Had a furnace service and found multiply errors in our system from an amateur installer. Very fair price to correct problems and will definitely use again.

by dflynn in Ajax on Twintech Heating and Cooling

Had to replace the heating & a/c unit in a condo apartment dwelling. this company recommended by the property manager and president of the condo building. found their workmanship and attention to details very good and very thorough. were able to resolve small problems and situations and happy to feel the heat in my unit. it's pricey, but happy was done by a very professional service. thank you.

by alisiena from Toronto on Twintech Heating and Cooling

Fantastic team. Completed the job as per the specifications and in under 3 hours. Highly recommended Twintech.

by David from Toronto on Twintech Heating and Cooling

During the summer, I previously hired TwinTech to replace my air conditioner when it failed. They did an excellent job so when I decided to proactively replace the furnace I contacted them. The furnace I had was 22 years old and showed signs of internal leakage. It still worked but rather than wait to have it fail in cold weather, I decided to purchase a higher efficiency model before it failed and take advantage of energy efficiency rebates. TwinTech offered very useful advice on the make and model of furnace to choose including high efficiency and variable speed motor. The price was reasonable, TwinTech arrived at the allotted time, installed the new furnace (including some re-routing of exhaust lines since the existing ones were too close to other vents), removed the old furnace, tested the installation and cleaned everything up. Overall, it was a good experience, they did a great job and the new furnace is working well.

See What Our Customers Are Saying:

by Robert Rogers on Twintech Heating and Cooling

Very pleased with the professional service that TwinTech Heating and Cooling provided in replacing my furnace. I got several quotes from different service providers. Their price was excellent and they explained the features very well. We are very glad we went with TwinTech and highly recommend their services.

by Robert Mizuno on Twintech Heating and Cooling

We were new homeowners in need of a second opinion. TwinTech Heating & Cooling were Amazing and professional. Very knowledgeable and great service all around. Recommend to anyone looking for honest and reliable services. Treated with respect and care. Thank you Greg, Mitch and Bob!

by Ruth on Twintech Heating and Cooling

TwinTech is an excellent and honest company! I called them for a second opinion after being told by another company that I needed to replace my furnace. Turns out this was not the case at all! I did not need a new furnace. TwinTech did not push to make an unnecessary sale and saved me from a huge expense. Bob and Mitch were extremely professional and above all honest! I definitely recommend TwinTech!

by Anna Chin on Twintech Heating and Cooling

Amazing experience with TwinTech Heating & Cooling! Their team was professional, knowledgeable, and efficient from start to finish. They installed my new furnace quickly and left everything spotless. The technicians took the time to explain everything and made sure I was comfortable with the system before they left. Great customer service and fair pricing. I highly recommend them for anyone needing HVAC services!

by Connor Agnew on Twintech Heating and Cooling

Great experience all around. Bob was sharp and easy to talk to, and Greg handled the installation perfectly. Would hire them again in a heartbeat.

HVAC 101: Awesome Cleaning Projects

  • SUBMITTED BY:
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  • - May 14, 2018

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What is the Difference Between a Heat Pump and a Furnace?

  • SUBMITTED BY:
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  • - February 12, 2020

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Exhaust Hose Extension Help on Portable A/C

  • SUBMITTED BY:
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  • - May 21, 2023

I bought a black and decker portable A/C very similar to the one in these pictures with those exact parts. It has a 5. 9” exhaust hose. I am looking for parts to extend the exhaust hose but I feel like I'm missing a part. I boug

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