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Tempstar Gas furnace *80CSU0802120B*

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

Technical Specifications

Product Specs

  • AHRI unit role: Furnace
  • AHRI model/pattern: *80CSU0802120B*
  • AHRI records represented: 151
  • AHRI equipment type: Central HP
  • AHRI tonnage: 2.9
  • AHRI refrigerant: R-454B
  • Verified catalog model: *80CSU0802120B*
  • Verified product family: Ion 80 Ultra Low NOx Gas Furnace
  • Verified catalog brand: Tempstar
  • 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.tempstar.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 217909456

AHRI 217909456 identifies a Mass Save qualified Central HP <5.4 tons from TEMPSTAR with outdoor unit N5H9V36*K*AAA* and indoor unit EVM5X43M21A*.
Eligible Central HP <5.4 tons

AHRI 217909463

AHRI 217909463 identifies a Mass Save qualified Central HP <5.4 tons from TEMPSTAR with outdoor unit Q5H9V36*K*AAA* and indoor unit EVM5X43M21A*.
Eligible Central HP <5.4 tons

AHRI 217910375

AHRI 217910375 identifies a Mass Save qualified Central HP <5.4 tons from TEMPSTAR with outdoor unit N5H9V36*K*AAA* and indoor unit EVM5X48M21A*.
Eligible Central HP <5.4 tons

AHRI 217910382

AHRI 217910382 identifies a Mass Save qualified Central HP <5.4 tons from TEMPSTAR with outdoor unit Q5H9V36*K*AAA* and indoor unit EVM5X48M21A*.
Eligible Central HP <5.4 tons

AHRI 217911556

AHRI 217911556 identifies a Mass Save qualified Central HP <5.4 tons from TEMPSTAR with outdoor unit N5H9V36*K*AAA* and indoor unit EVD5X36M21A*.
Eligible Central HP <5.4 tons

AHRI 217911563

AHRI 217911563 identifies a Mass Save qualified Central HP <5.4 tons from TEMPSTAR with outdoor unit Q5H9V36*K*AAA* and indoor unit EVD5X36M21A*.
Eligible Central HP <5.4 tons

AHRI 217914142

AHRI 217914142 identifies a Mass Save qualified Central HP <5.4 tons from TEMPSTAR with outdoor unit N5H9V36*K*AAA* and indoor unit EVD5X48M21A*.
Eligible Central HP <5.4 tons

AHRI 217914149

AHRI 217914149 identifies a Mass Save qualified Central HP <5.4 tons from TEMPSTAR with outdoor unit Q5H9V36*K*AAA* and indoor unit EVD5X48M21A*.
Eligible Central HP <5.4 tons

AHRI 217914971

AHRI 217914971 identifies a Mass Save qualified Central HP <5.4 tons from TEMPSTAR with outdoor unit N5H9V48*K*AAA* and indoor unit EVM5X48M21A*.
Eligible Central HP <5.4 tons

AHRI 217914976

AHRI 217914976 identifies a Mass Save qualified Central HP <5.4 tons from TEMPSTAR with outdoor unit Q5H9V48*K*AAA* and indoor unit EVM5X48M21A*.
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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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Ray

Just had a service call because my tankless water heater stopped working with E110 code. Andrey located the root cause real quick and fixed the issue within half an hour, also gave reasonable recommendations for further maintenance.

Randy J.

Thanks to Andrey for an amazingly quick response to my request for a service call. He diagnosed and fixed my issue within 24 hours of my asking for help. Excellent service. Thanks.

Jack B.

Andrey always does a great job.

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...

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