York Diamond 90 Furnaces | FurnaceCompare®

York Diamond 90 Furnace Overview

The Diamond 90 is a single-stage gas furnace manufactured by York. This furnace has some features consumers may not find on older single-stage furnaces, such as electronic ignition and a direct drive blower. The York Diamond 90 has an annualized fuel utilization efficiency (AFUE) rating of up to 94%.

The blower unit on the Diamond 90 is insulated to operate more quietly and the top intake and venting allow the Diamond 90 to be installed in tight spaces. The heat exchanger is constructed from steel that has been coated in aluminum for increased durability.

Furnace Filters for the York Diamond 90

Air Flow ConfigurationCabinet WidthFilter Size(s)
All14.5×28.5″14x25x1 (bottom)
All17.5×28.5″16x25x1 (bottom)
All21×28.5″20x25x1 (bottom)
All24.5x-28.5″22x25x1 (bottom)
AllAll16x25x1 (side)

Questions about this model?

Consumer Reviews of York Diamond 90


  • Very Satisfied
  • Somewhat Satisfied
  • Neutral
  • Somewhat Unsatisfied
  • Very Unsatisfied
  • #7 of 20 York Furnace
  • 60% of customers recommended

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York Diamond 90 Furnace Reviews

"Not a real York fan"

1.0 rating
Very Unsatisfied

We have had this furnace since 2000 and it has had something go wrong with it just about every year! I am not sure how much money I have put into it or the amount of time I have invested in labor. I have put 3 mother boards, 2 pressure switches, 1 blower motor, 1 squirrel cage and now something with the condenser. I have been fortunate that I can do the repairs myself with the help of AAA parts. I know I should have gotten rid of it a long time ago but there was always a money issue and it always seems to break down in the middle of winter. Living in Michigan you kind of need a furnace. Now is the time to get rid of it.

Howell, MI

"Unhappy customer"

1.0 rating
Very Unsatisfied

I have a York furnace, the heat exchanger went bad, still under warranty! Great news except that the part is no longer available. Company will give me money off on a new one but have to buy new one first. This is not what I would call good business relations. Why would I want to go with the same brand if I don’t know what they will give me. On a new purchase?

Clinton, IA

"my new furnace is a dream"

5.0 rating
Very Satisfied

About 10 years ago the gas company replaced my meter. While trying to relight my pilot, the gas man noticed a problem and put it out of service. We had a local company inspect it and they found holes in the heat exchanger. He put in our new York and our gas bill went down $50.00 the next month. In ten years it has run faultlessly. It is very quiet and definitely efficient. It also has a diagnostic system and if it ever has a problem the repairman just reads it to identify the problem. I will and have recommended York to friends.

washburn wi.

"We’re happy with it"

5.0 rating
Very Satisfied

We found this site looking for a replacement pressure switch for our furnace Diamond 90 series (the original has started to stick closed – thanks for the detailed information, diagnostic led – and the furnace won’t start unless we rap it gently to unstick it). And we replaced an ignitor a year or so ago. Nonetheless, as we enter our ninth central New Hampshire heating season we’re happy with it (though not with the current price of propane, which is causing us to start looking at standing-column well heat pumps and pellet stoves; folks with access to natural gas should still find operating costs attractive, though): we’ve performed no routine maintenance at all (probably should at least get a brush to check the flame tubes for carbon, but there’s been no loss of efficiency so it’s probably not too bad), the two repairs we’ve had to make have been inexpensive (on eBay) diy jobs, and otherwise our DIY-installed $1150 furnace (plus a few hundred more for installation hardware: we used to heat our open-plan house quite comfortably with a centrally-located wood stove and just ran a single duct to the same location) has served us well.

Central NH

"Mr Happy"

5.0 rating
Very Satisfied

I have had a YORK Diamond 90 gas furnace for 16 years and no service calls EVER. Quality to the end: ‘It’s time to get comfortable.’

Rochester NY

Other Diamond 90 Reviews

Reviews of this furnace cite problems with it blowing cold air instead of heated air.

At doityourself.com forum owners express problems with the York Diamond 90 blowing cold air; the furnace will not stay ignited. One user found out through a HVAC professional service call that it is was a problem with the wiring harness caused by constant vibration. The online professional said that this type of problem is hard to find and the service person deserved a special gift for his diligence.

One consumer asks about the location of any reset buttons on justanswer.com. In some cases these buttons can solve the problem of the furnace blowing only cold air. An ignition problem is discussed on fixya.com; cleaning the ignition area can help the igniter stay lit.

Question and Answer


Why does the sensor shows 3 flashes?


First, if you are getting an error code you need to call an HVAC tech to properly diagnose the problem. The following are general fault codes for York furnaces however your model may vary.

  • Slow Green: Normal Operation
  • Slow Amber: Normal Operation With Call For Heat
  • Steady on Red: Control Failure
  • Rapid Amber: Low Flame sense
  • 1 Red: Flame present with gas off
  • 2 Red: Pressure Switch stuck closed
  • 3 Red: Pressure switch stuck open
  • 4 Red: Limit switch open
  • 5 Red: Rollout switch open
  • 6 Red: Pressure switch cycle lockout
  • 7 Red: Ignition lockout due to retries
  • 8 Red: Ignition lockout due to recycles
  • 9 Red: Grounding or line polarity fault
  • 10 Red: Gas flow with no call for heat
  • 11 Red: Limit switch open or blower failure
  • 4 Amber: Y present with no g call

York Diamond 90 Model Numbers

The Diamond 90 is available in different models which vary in efficiency and capacity.

Model Number AFUE BTUs per Hour
P3DHA10N03701 91 40,000
P3DHB12N05501 91 60,000
P3DHB12N07501 91 80,000
P3DHC16N07501 91 80,000
P3DHC20N09501 91 100,000
P3DHD20N11201 91 120,000
P3URA10N03701 92.4 40,000
P3URB10N05501 92.2 60,000
P3URB12N07501 92 80,000
P3URC14N09501 92.2 100,000
P3URC16N07501 94.3 80,000
P3URC20N09501 93 100,000
P3URD20N11201 92 120,000
P3URD20N13001 92 140,000

Diamond 90 Warranty

York offers an extended warranty to cover limited labor costs in addition to the regular warranty. Customers can add this optional warranty when they purchase the York Diamond 90. The optional warranty plans can cover the parts and labor for up to ten years. The regular warranty consists of the following:

  • Twenty-year limited warranty on the heat exchanger
  • Five-year limited warranty on parts

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