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Heat pump condensing unit

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Trane Heat pump condensing unit GSK120A3

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Trane Trane AHRI Outdoor - Axiom Rooftop Water Source Heat Pump Heat pump condensing unit Repair, maintenance, and replacement planning
Trane GSK120A3 product image

Technical Specifications

Product Specs

  • AHRI unit role: Outdoor
  • AHRI model/pattern: GSK120A3
  • AHRI records represented: 1
  • AHRI equipment type: Ground Loop
  • AHRI tonnage: 11.111166666666668
  • Verified catalog model: GSK120A3
  • Verified product family: Axiom Rooftop Water Source Heat Pump
  • Verified catalog brand: Trane
  • Verified model family: GSK
  • AHRI model/pattern: GSK120A3
  • Base catalog model/pattern: GSK120A3
  • Application: commercial rooftop water-source heat pump
  • Nominal capacity: 10 ton
  • Refrigerant: R-454B
  • Official product page: https://www.trane.com/commercial/north-america/us/en/products-systems/packaged-units-and-split-systems/water-source-heat-pumps/rooftop-wshp.html
  • Configuration: rooftop WSHP packaged unit
  • Unit controller family: Symbio 700

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.

Troubleshooting

Error Codes

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Anti-short cycle Compressor timing control

Compressor anti-short-cycle timing active

Document the flash pattern, check thermostat, filter, and visible outdoor-unit obstruction status, and schedule service if the condition remains.
Brownout condition Low-voltage protection

Low-voltage brownout diagnostic

Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service.
Soft lockout LP Low pressure safety

Low-pressure soft lockout

Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service.
Soft lockout HP High pressure safety

High-pressure soft lockout

Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service.
Manual lockout LP Low pressure safety

Low-pressure manual lockout

Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service.
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Certification match

AHRI certificates

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Eligible Ground Loop

AHRI 215746922

AHRI 215746922 identifies a Mass Save qualified Ground Loop from TRANE with outdoor unit GSK120A3.

Service planning

How GreenFlow handles GSK120A3 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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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...

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.

Terry S.

Excellent service from best tech!

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...

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