Green Flow Solution logo
Schedule Service

Gas furnace

Back to Comfortmaker products

Comfortmaker Gas furnace *80CSU1002120B*

Request ServiceEquipment Quote
Comfortmaker Comfortmaker AHRI Furnace - Ion 80 Ultra Low NOx Gas Furnace Gas furnace Repair, maintenance, and replacement planning
Comfortmaker *80CSU1002120B* product image

Technical Specifications

Product Specs

  • AHRI unit role: Furnace
  • AHRI model/pattern: *80CSU1002120B*
  • AHRI records represented: 129
  • AHRI equipment type: Central HP
  • AHRI tonnage: 3.9166666666666665
  • AHRI refrigerant: R-454B
  • Verified catalog model: *80CSU1002120B*
  • Verified product family: Ion 80 Ultra Low NOx Gas Furnace
  • Verified catalog brand: Comfortmaker
  • Verified model family: F80CSU
  • AHRI model/pattern: *80CSU1002120B*
  • Nominal input: 100,000 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

View All
Eligible Central HP <5.4 tons

AHRI 217728881

AHRI 217728881 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 217728882

AHRI 217728882 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 217728936

AHRI 217728936 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 217909467

AHRI 217909467 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 217909474

AHRI 217909474 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 217915384

AHRI 217915384 identifies a Mass Save qualified Central HP <5.4 tons from COMFORTMAKER with outdoor unit N5H9V48*K*AAA* and indoor unit EVM5X49M21A*.
Eligible Central HP <5.4 tons

AHRI 217915389

AHRI 217915389 identifies a Mass Save qualified Central HP <5.4 tons from COMFORTMAKER with outdoor unit Q5H9V48*K*AAA* and indoor unit EVM5X49M21A*.
Eligible Central HP <5.4 tons

AHRI 217915814

AHRI 217915814 identifies a Mass Save qualified Central HP <5.4 tons from COMFORTMAKER with outdoor unit N5H9V48*K*AAA* and indoor unit EVM5X60M21A*.
Eligible Central HP <5.4 tons

AHRI 217915819

AHRI 217915819 identifies a Mass Save qualified Central HP <5.4 tons from COMFORTMAKER with outdoor unit Q5H9V48*K*AAA* and indoor unit EVM5X60M21A*.
Eligible Central HP <5.4 tons

AHRI 217916257

AHRI 217916257 identifies a Mass Save qualified Central HP <5.4 tons from COMFORTMAKER with outdoor unit N5H9V48*K*AAA* and indoor unit EVD5X48M21A*.
Loading more

Service planning

How GreenFlow handles *80CSU1002120B* 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.

Our Services

Showing services from our catalog

Brands We Service

Popular cities

Service Areas

Our Happy Customers

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...

Dev W.

I had a breakdown of my cooling system and Hanna at Green Flow responded to my request right away. They scheduled me same day. The team at Green Flow was easy to communicate with over phone and text. They kept me updated on delays on arrival of the...

Jack B.

Andrey always does a great job.

View All