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CODE-12

Carrier · Carrier 25VNA Infinity Greenspeed Variable-Speed Heat Pump

Carrier Carrier 25VNA Infinity Greenspeed Variable-Speed Heat Pump CODE-12 Error Fix: Infinity Code 12 — No Cooling / Call Not Satisfied

The Infinity System Control displays "Code 12" indicating the system is calling for cooling but the thermostat set point has not been reached within the expected time. This is a general code that can result from many underlying issues: the outdoor unit may not be running (check the circuit breaker and disconnect), refrigerant charge may be low, the condenser coil may be dirty, the air filter may be clogged, ductwork may be leaking, or the system may be undersized for the cooling load. Review the other Infinity diagnostics for more specific fault codes. If no other codes are present, check the basics: is the outdoor unit running? Is the indoor blower running? Is the air filter clean? Are supply vents open? Is the condenser coil clean? The Infinity system tracks how long it takes to satisfy a call — extended run times trigger this alert.

Low severity2 fixes available

Quick Answer

Error CODE-12 on the Carrier Carrier 25VNA Infinity Greenspeed Variable-Speed Heat Pump means: Infinity Code 12 — No Cooling / Call Not Satisfied. The top-ranked community fix is “Clean Outdoor Condenser Coil and Test Refrigerant Charge” (medium difficulty, ~60 min, DIY cost: $10-$20). 2 community-ranked fixes available below.

Published February 2026 · 2 fixes · heat pump

Content is based on manufacturer service documentation, community repair experience, and OEM technical bulletins. Always verify with your owner's manual.Learn about our editorial standards.

When to Call a Professional

While many heat pump repairs can be done safely at home, consider hiring a qualified technician if:

The repair involves electrical wiring, gas lines, or refrigerant
You've tried the top-ranked fix and the error persists
You smell gas, see sparking, or notice water leaking
The repair requires specialized tools you don't have
Your appliance is still under manufacturer warranty

Average professional repair cost for this issue: $150-$300.

Other Carrier Models with Error CODE-12

Carrier 26VNA1 Infinity 21 Variable-Speed Air Conditioner with Greenspeed Intelligence

air_conditioner · 2 fixes

Other Carrier Carrier 25VNA Infinity Greenspeed Variable-Speed Heat Pump Error Codes

CODE-11

Infinity Code 11 — No Heat / Heating Call Not Satisfied

2 fixes

CODE-31

Infinity Code 31 — High-Pressure Protection

2 fixes

CODE-32

Infinity Code 32 — Low-Pressure Protection

2 fixes

CODE-33

Infinity Code 33 — Outdoor Coil Thermistor Open/Short

2 fixes

CODE-34

Infinity Code 34 — Indoor Coil Thermistor Issue

2 fixes

CODE-51

Infinity Code 51 — Over/Under Charge Protection

2 fixes

CODE-52

Infinity Code 52 — Outdoor Unit Lost Communication

2 fixes

CODE-53

Infinity Code 53 — Indoor Unit Lost Communication

2 fixes

People Also Ask About Carrier Carrier 25VNA Infinity Greenspeed Variable-Speed Heat Pump Error CODE-12

What does error code CODE-12 mean on a Carrier Carrier 25VNA Infinity Greenspeed Variable-Speed Heat Pump?

Error code CODE-12 on the Carrier Carrier 25VNA Infinity Greenspeed Variable-Speed Heat Pump means: Infinity Code 12 — No Cooling / Call Not Satisfied. The Infinity System Control displays "Code 12" indicating the system is calling for cooling but the thermostat set point has not been reached within the expected time. This is a general code that can result from many underlying issues: the outdoor unit may not be running (check the circuit breaker and disconnect), refrigerant charge may be low, the condenser coil may be dirty, the air filter may be clogged, ductwork may be leaking, or the system may be undersized for the cooling load. Review the other Infinity diagnostics for more specific fault codes. If no other codes are present, check the basics: is the outdoor unit running? Is the indoor blower running? Is the air filter clean? Are supply vents open? Is the condenser coil clean? The Infinity system tracks how long it takes to satisfy a call — extended run times trigger this alert.

How do I fix error code CODE-12 on my Carrier Carrier 25VNA Infinity Greenspeed Variable-Speed Heat Pump?

The most successful fix is "Clean Outdoor Condenser Coil and Test Refrigerant Charge" (medium difficulty, ~60 minutes). Estimated DIY cost: $10-$20. HomeMD has 2 community-ranked fixes for this error.

Is error code CODE-12 on a Carrier Carrier 25VNA Infinity Greenspeed Variable-Speed Heat Pump serious?

This error is rated low severity. It is generally not urgent and can often be resolved with a simple DIY fix.

Can I fix Carrier Carrier 25VNA Infinity Greenspeed Variable-Speed Heat Pump error CODE-12 myself?

Yes — the top-ranked community fix ("Clean Outdoor Condenser Coil and Test Refrigerant Charge") is rated medium difficulty and takes about 60 minutes. Tools needed: Garden hose, Soft brush, HVAC manifold gauge set, T20 Torx screwdriver.

How much does it cost to repair Carrier Carrier 25VNA Infinity Greenspeed Variable-Speed Heat Pump error CODE-12?

DIY cost: $10-$20. Professional repair typically costs $150-$300. Many homeowners save money by trying the top-ranked community fix first.

What other error codes does the Carrier Carrier 25VNA Infinity Greenspeed Variable-Speed Heat Pump have?

The Carrier Carrier 25VNA Infinity Greenspeed Variable-Speed Heat Pump has 8 other known error codes, including: CODE-11 (Infinity Code 11 — No Heat / Heating Call Not Satisfied), CODE-31 (Infinity Code 31 — High-Pressure Protection), CODE-32 (Infinity Code 32 — Low-Pressure Protection), CODE-33 (Infinity Code 33 — Outdoor Coil Thermistor Open/Short), CODE-34 (Infinity Code 34 — Indoor Coil Thermistor Issue), and 3 more.

Which other Carrier models have the CODE-12 error?

Error code CODE-12 also appears on 1 other Carrier model: Carrier 26VNA1 Infinity 21 Variable-Speed Air Conditioner with Greenspeed Intelligence. The fix may vary by model, so check each model's specific page for tailored repair steps.

What other error codes does the Carrier Carrier 25VNA Infinity Greenspeed Variable-Speed Heat Pump have?

The Carrier Carrier 25VNA Infinity Greenspeed Variable-Speed Heat Pump has 8 other known error codes:

Which other Carrier models have the CODE-12 error?

Error code CODE-12 also appears on 1 other Carrier model:

Carrier 26VNA1 Infinity 21 Variable-Speed Air Conditioner with Greenspeed Intelligence (air conditioner) · 2 fixes

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