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Comfortmaker Gas furnace *80CSU0802120B*

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Comfortmaker Comfortmaker AHRI Furnace - Ion 80 Ultra Low NOx Gas Furnace Gas furnace Repair, maintenance, and replacement planning
Comfortmaker *80CSU0802120B* product image

Technical Specifications

Product Specs

  • AHRI unit role: Furnace
  • AHRI model/pattern: *80CSU0802120B*
  • AHRI records represented: 154
  • AHRI equipment type: Central HP
  • AHRI tonnage: 3.9166666666666665
  • AHRI refrigerant: R-454B
  • Verified catalog model: *80CSU0802120B*
  • Verified product family: Ion 80 Ultra Low NOx Gas Furnace
  • Verified catalog brand: Comfortmaker
  • Verified model family: F80CSU
  • AHRI model/pattern: *80CSU0802120B*
  • Nominal input: 80,000 BTU/h input
  • AFUE family: 80%
  • Heating stages: single-stage
  • Blower: variable-speed
  • NOx classification: ultra-low NOx
  • Cabinet width code: 21
  • Application: matched gas furnace for split-system air conditioner or heat pump combinations
  • Official product page: https://www.comfortmaker.com/en/us/products/gas-furnaces/ion-80-ultra-low-nox-gas-furnace

Useful troubleshooting details

  • Confirm the installed model and serial number, matched indoor or outdoor equipment, voltage, refrigerant, controls, and AHRI certificate before service or replacement planning.
  • Use the linked AHRI certificates to verify matched-system combinations, rebate conversations, and equipment eligibility before quoting replacement work.
  • Collect photos of the nameplate, equipment access, recent fault history, and comfort symptoms before dispatch or proposal planning.

Certification match

AHRI certificates

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Eligible Central HP <5.4 tons

AHRI 217728879

AHRI 217728879 identifies a Mass Save qualified Central HP <5.4 tons from COMFORTMAKER with outdoor unit C5H0V48*K*AAA* and indoor unit H,GG35*48+TXV.
Eligible Central HP <5.4 tons

AHRI 217728880

AHRI 217728880 identifies a Mass Save qualified Central HP <5.4 tons from COMFORTMAKER with outdoor unit C5H0V48*K*AAA* and indoor unit H,GG2K*60+TXV.
Eligible Central HP <5.4 tons

AHRI 217728935

AHRI 217728935 identifies a Mass Save qualified Central HP <5.4 tons from COMFORTMAKER with outdoor unit C5H0V60*K*AAA* and indoor unit H,GG2K*60+TXV.
Eligible Central HP <5.4 tons

AHRI 217909452

AHRI 217909452 identifies a Mass Save qualified Central HP <5.4 tons from COMFORTMAKER with outdoor unit N5H9V36*K*AAA* and indoor unit EVM5X43M21A*.
Eligible Central HP <5.4 tons

AHRI 217909459

AHRI 217909459 identifies a Mass Save qualified Central HP <5.4 tons from COMFORTMAKER with outdoor unit Q5H9V36*K*AAA* and indoor unit EVM5X43M21A*.
Eligible Central HP <5.4 tons

AHRI 217910371

AHRI 217910371 identifies a Mass Save qualified Central HP <5.4 tons from COMFORTMAKER with outdoor unit N5H9V36*K*AAA* and indoor unit EVM5X48M21A*.
Eligible Central HP <5.4 tons

AHRI 217910378

AHRI 217910378 identifies a Mass Save qualified Central HP <5.4 tons from COMFORTMAKER with outdoor unit Q5H9V36*K*AAA* and indoor unit EVM5X48M21A*.
Eligible Central HP <5.4 tons

AHRI 217911552

AHRI 217911552 identifies a Mass Save qualified Central HP <5.4 tons from COMFORTMAKER with outdoor unit N5H9V36*K*AAA* and indoor unit EVD5X36M21A*.
Eligible Central HP <5.4 tons

AHRI 217911559

AHRI 217911559 identifies a Mass Save qualified Central HP <5.4 tons from COMFORTMAKER with outdoor unit Q5H9V36*K*AAA* and indoor unit EVD5X36M21A*.
Eligible Central HP <5.4 tons

AHRI 217914138

AHRI 217914138 identifies a Mass Save qualified Central HP <5.4 tons from COMFORTMAKER with outdoor unit N5H9V36*K*AAA* and indoor unit EVD5X48M21A*.
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Service planning

How GreenFlow handles *80CSU0802120B* requests

1

Identify the equipment

Confirm the model or series name, serial number if available, photos, and whether the unit is roof, exterior, basement, or mechanical-room equipment.

2

Describe the service issue

Share no heat, no cooling, weak airflow, error codes, alarms, leaks, noise, control problems, or comfort complaints.

3

Review access and history

Include access notes, tenant or business-hour constraints, filter status, recent repairs, and maintenance records when available.

4

Plan the next step

GreenFlow can route the request for diagnostics, repair planning, maintenance, replacement scope, or related system upgrades.

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Our Happy Customers

Anna F.

They showed up within an hour of me making the call on a Sunday. They fixed our system and taught us how to replace the fuse in the future. We would definitely call again.

Sharad W.

Green Flow and the people who work there are terrific. Vlad and Andre are excellent. Andre was very helpful. He was punctual, respectful, efficient and knowledgeable. He did not try to sell me something I didn’t need ( as others have done before). I was charged $99 which...

John F.

I needed 2 new AC units and decided to go with high efficiency heat pumps. I chose Greenflow because of the equipment they offered, and the price (2nd lowest quote and much cheaper than the average of all quote we received). Their technicians were very detail oriented and...

Anna G.

They quickly identified the issue with the heating system and fixed it efficiently. He explained everything clearly and made sure I understood what was going on. Very professional and reliable, extremely satisfied with the service.

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