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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 Tracy, Pickering on Twintech Heating and Cooling

We couldn’t have been more impressed with Twintech - from our first service call with Mitch who took the time to thoroughly diagnose the issue with our furnace, to Dave who proposed a well thought out solution to meet our needs and finally Greg and team who acted quickly to install given we had no heat.


We did our due diligence by soliciting quotes from alternate providers and were shocked and disappointed by the aggressive and manipulative tactics used.


Twintech was honest in their approach, detailed in their product knowledge, reasonably priced, diligent in their follow-up and valued our business.


Well done Twintech! You made this a positive experience for us and our new furnace works beautifully!

by Skapoor, Ajax on Twintech Heating and Cooling

We recently purchased an Amana high efficiency furnace and humdifier through Twintech. The work was completed very professionally and the quality of the workmanship was high. There was some additional sheet metal work required to complete the installation, which they were able to complete themselves. Overall I am very pleased with the work and would highly recommend Twintech for a furnace replacement.

by Steve, Oshawa on Twintech Heating and Cooling

We were very pleased with every aspect of the work that was done. They were very professional and polite. They arrived when they said they would and job was completed on estimated time


We would highly recommend them to whoever needed a recommendation


We have a very large dog and they were very understanding and respectful of him being around

by Patrick, Toronto on Twintech Heating and Cooling

The blower on our furnace stopped working leaving us with a cold house. Dave from TwinTech responded immediately to our HomeStars service request. From beginning to end Dave was nothing but helpful, friendly and professional, he did a great job of walking us through the quote and scope of work.


The replacement of the furnace went smoothly. The Guys did a great job, everyone was very friendly and polite. There were no hiccups, or unexpected costs. The only surprise was they left the work area cleaner than it was before they started.


Was a great experience with the whole TwinTech team. Its been a couple of months since the new furnace has been installed and its working great!

by Ed, Whitby on Twintech Heating and Cooling

I heard about TwinTech when researching new furnaces at furnaceprices.ca. After contacting them about my broken down furnace, Dave came to my house the next day to assess my situation and requirements for a new furnace. He recommended one that had stainless steel heat exchangers which sold me since my previous furnace had issues with a rusted secondary heat exchanger that had to be replaced. Dave also set me up with an appointment with an energy audit company so that I could take advantage of a rebate to help improve the energy efficiency of my home and get some money back. A few days later, Greg, Grant, and Mitch came to install the new furnace and remove the old one. When delivering and removing the furnaces, they were very careful not to damage my floors and walls, and even laid out red carpeting to protect the floors. They were very friendly and professional. The installation was completed in the time they said it would take and they cleaned up their work areas. Within a week, Dave called to follow-up to see how everything was going. I have already recommended them to several friends and family members who may need new furnaces soon.

by Fred, Toronto on Twintech Heating and Cooling

Twintech did a great job, from Dave the Sales Rep to the Office staff and The Professional Technicians who did the installation. They were professional, courteous, knowledgable and informative. From beginning to follow up we were completely satisfied with everything. Thanks Again. Sincerely The Laytons

by Elle, Oshawa on Twintech Heating and Cooling

Great product, great service, great follow-up. The Twintech Heating and Cooling arranged removal of my existing oil tank and they installed the new gas furnace Amana (made in USA). I am very happy with the final result and support I received throughout the process. My thanks go to the entire Twintech team for their professionalism, great communication and follow-up.

by John & Linda, Ajax on Twintech Heating and Cooling

We've had Twintech provide us with work in the past, for an inground pool heater and required rough-in for a new gas stove. More recently they provided the same friendly, professional, timely and clean installation of our new furnace.

by Bill, Whitby on Twintech Heating and Cooling

Reasonable price and the workmanship was prompt and timely and the employees were great to deal with.

by Nadia, Toronto on Twintech Heating and Cooling

The sales process was friendly, informative, and very consultative. They worked hard to earn our business by taking a careful look around our home to assess our needs, providing a lot of information about the product, and answering all our questions and finding the right solution for our home at a competitive price. They prepared us very well for what to expect on installation day, and the installation went very smoothly - no surprises, all very professional! They gave us a call after installation to ensure we were happy with the work. We're very happy that we chose to work with TwinTech to get our new furnace.

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.

Is My Air Conditioner Miswired?

  • SUBMITTED BY:
  • TWINTECH HEATING & COOLING
  • - August 16, 2024

If you suspect your air conditioner is miswired, it could lead to improper functioning, electrical issues, or potential damage. Here are some signs that your air conditioner might be miswired: 1. Unit Not Turning On Issue: If your air condit

Read More

Are Portable ACs at all useful if you have no other options?

  • SUBMITTED BY:
  • TWINTECH HEATING & COOLING
  • - April 21, 2023

I have a friend who lives in an apartment that does not allow window units to be placed. Seems their only option is one of the portable ACs that stand on the floor that you just use the vent / exhaust hose going out the window. This would only

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Why Choose an Armstrong Heat Pump?

  • SUBMITTED BY:
  • TWINTECH HEATING & COOLING
  • - February 21, 2024

Choosing an Armstrong heat pump can offer several benefits depending on your specific needs and preferences. Here are some reasons why you might consider selecting an Armstrong heat pump: Energy Efficiency: Armstrong heat pumps are designed to

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How Do You Choose an HVAC Technician?

  • SUBMITTED BY:
  • TWINTECH HEATING & COOLING
  • - November 22, 2019

An HVAC technician is there to help when something goes wrong with your heating or cooling unit. These skilled workers are hired to come to your house, inspect the unit, and do what they can to make your home comfortable again. But how do you choose

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