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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 Private User from Private User on Twintech Heating and Cooling

I have used Twintech many times over the years. They always arrive quickly and get the issue fixed. The most recent incident was when my air conditioner broke last week I called Greg at 11:30am and he was at my home by 2:30pm he had the unit fixed by 3:30pm. Twintech are very reliable and honest and they are experts in the field. I have already recommended them to many of my friends. I would not use anyone but them for my heating and air conditioning issues.

by Kate A in Pickering on Twintech Heating and Cooling

I would highly recommend these guys, professional, fast and competitive pricing. I moved into this place with no working AC unit with a 8 month baby, he was able to come with in a week to fix even in the busy summer days. He really values his customers , I am already recommending to my neighbors.

by Private User in Whitby on Twintech Heating and Cooling

Very impressed they arrive to quote even though I had forgotten to call them back to confirm date & time. They showed the day before installation to deliver the unit. Returned the next day as promised at 9am. Project was completed in a professional manner. They even fixed a few things that they noticed were not installed correctly, or to code by previous heating & air contractors we had at our residence before. Would recommend this company to everyone!

by Private User from Bowmanville on Twintech Heating and Cooling

Greg removed old oil furnace and oil tank from basement relocated new Napoleon propane furnace to allow duct work to be rerouted to a much more suitable location. Moved air conditioner to the new furnace. Dave recommended two available grants to assist with cost. They kept to their original quoted price which was substantially lower than a competitors for the same furnace and work. They completed the work as stated when stated and left the area clean and tidy. We are very pleased with the outcome.

by astephenson in Oshawa on Twintech Heating and Cooling

Twintech installed a Goodman furnace and ac init. Very professional install, both units are working well.

by rcnichols electric in Whitby on Twintech Heating and Cooling

We had Grant and Greg Dainty quote to replace our 20 yr old furnace. I have known them for years and have had other jobs done by them ( AC and Pool Htr). The price was very reasonable and the job was completed in one day.

by Rick. F. in Pickering on Twintech Heating and Cooling

TwinTech was the right choice. Our consultation with Dave set the tone. Professional and knowledgeable, we even received a follow-up call within hours of our install completion, wow! TwinTech arrived as scheduled to install our A/C unit. Within minutes of arrival Greg noted and explained a few out of code faults on our furnace installed by another company, problems fixed, thanks TwinTech. Greg, Grant and "Subaru" Pete were meticulous start to finish. Highly recommended!

by Taresh, Pickering on Twintech Heating and Cooling

Twintech replaced our aging +20 yrs old Furnace & AC with the variable high efficiency Napoleon Furnace matched with the Goodman AC. Sales guy ,Dave was great, gave a no pressure estimate, explained about the Government Rebate program which they took care of completely including arranging the home energy audit. On the scheduled day Greg and his team arrived on time, did a great job and completed the same day , extremely professional and courteous, cleaned up everything , tested the system, Greg took his time to explain the setup. Very impressed with the Napoleon Furnace 9600 which did a great job in maintaining a comfortable temperature last winter and now with the hot weather the Goodman AC cooled the house in much less time than the old AC unit could ever. From start to finish Twintech were great and have no hesitation in recommending them 100%.

by Private User Pickering, ON on Twintech Heating and Cooling

The Twintech team did an excellent job installing our new Goodman air conditioner. They were polite and professional. Greg was knowledgeable and clearly experienced. Thank you Twintech for bringing our cooling system up to current regulations. Job well done!

by Y. M. from Pickering on Twintech Heating and Cooling

Dave from TwinTech was very knowledgeable, professional and thorough in the buying process. He helped us to identify the best furnace for our home and our budget. When we needed a new filter a year later and seemed to have a problem finding the right one, I called Dave up and he delivered a filter to me the next day! The cost was on par with other retailers, but it was this unexpected personal service that really was impressive. The furnace? Works like a charm.

See What Our Customers Are Saying:

by Aaron on Twintech Heating and Cooling

We are very happy to recommend this company to everyone. Our furnace broke down on Sunday morning. We phoned them and before noon Grant the owner showed up. He worked on the furnace for about a hour not wanting to give up to fix the problem. The furnace was 17 years old. I was the one talking about replacing it. End result was the next day it was all done. On the Sunday Bob came over with heaters to warm up the house. We decided to replace the water heater at the same time. Thanks Grant for the excellent work. Thumbs up.

by Linda on Twintech Heating and Cooling

Right on time. Explained how to work the HRV in a different way so the house would not be so dry. Changed my whole house water filter for me as well. Friendly, helpful, caring service!

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!

Simple Signs Your Furnace Needs Repair

  • SUBMITTED BY:
  • TWINTECH HEATING & COOLING
  • - March 10, 2025

A well-functioning furnace is essential for keeping your home warm and comfortable, especially during colder months. However, furnaces can develop issues over time, leading to inefficiencies or even breakdowns. Recognizing the signs that your f

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Heat Pumps: Heating and Cooling in One System

  • SUBMITTED BY:
  • TWINTECH HEATING & COOLING
  • - May 8, 2025

When it comes to maintaining year-round comfort in your home, few systems offer the convenience and efficiency of a heat pump. What sets heat pumps apart from traditional HVAC systems is their dual functionality—the ability to both heat and

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Portable A/C question

  • SUBMITTED BY:
  • TWINTECH HEATING & COOLING
  • - April 9, 2023

Hello!. My TURBRO 8000 BTU air conditioner is no longer cooling my room effectively. My exhaust tube is about 8 feet long, but I don't think that's the main problem. It was cooling my room effectively before, down to 74 when it was 8

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Is it normal to use aluminium tubing with external condenser units?

  • SUBMITTED BY:
  • TWINTECH HEATING & COOLING
  • - April 10, 2023

I'm a engineer by trade, and my A/C system just got started up for the first time since last spring here in AZ, noticed I wasn't getting cooling, went to check the external unit and the sound from the compressor was hollow and now it echoes.

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