❄️Air Conditioner

CODE-34

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

Carrier Carrier 26VNA1 Infinity 21 Variable-Speed Air Conditioner with Greenspeed Intelligence CODE-34 Error Fix: Infinity Code 34 — Indoor Coil Thermistor Issue

The Infinity System Control displays "Code 34" indicating the indoor evaporator coil temperature sensor is reporting an abnormal reading — open circuit, short circuit, or out-of-range temperature. This sensor monitors the evaporator coil temperature for freeze protection, charge management, and dehumidification control on Infinity systems. A failed sensor can cause the system to disable cooling to prevent evaporator freeze-up, or the system may operate in a limited safe mode. Check the sensor wiring at the air handler or furnace control board. The thermistor is typically clipped to the evaporator coil suction line. If the connection is secure and the issue persists, replace the thermistor ($10-$30 part). Note: if both CODE-33 and CODE-34 appear together, there may be a communication or wiring harness issue rather than individual sensor failures.

Medium severity2 fixes available✨ Free fix available

Quick Answer

Error CODE-34 on the Carrier Carrier 26VNA1 Infinity 21 Variable-Speed Air Conditioner with Greenspeed Intelligence means: Infinity Code 34 — Indoor Coil Thermistor Issue. The top-ranked community fix is “Replace Indoor Coil Thermistor Sensor” (medium difficulty, ~45 min, DIY cost: $15-$30). 2 community-ranked fixes available below.

Published February 2026 · 2 fixes · air conditioner

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 air conditioner 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: $120-$180.

Other Carrier Models with Error CODE-34

Carrier 25VNA Infinity Greenspeed Variable-Speed Heat Pump

heat_pump · 2 fixes

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

CODE-12

Infinity Code 12 — No Cooling / 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-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

CODE-61

Infinity Code 61 — Compressor Protection (Low Speed)

2 fixes

People Also Ask About Carrier Carrier 26VNA1 Infinity 21 Variable-Speed Air Conditioner with Greenspeed Intelligence Error CODE-34

What does error code CODE-34 mean on a Carrier Carrier 26VNA1 Infinity 21 Variable-Speed Air Conditioner with Greenspeed Intelligence?

Error code CODE-34 on the Carrier Carrier 26VNA1 Infinity 21 Variable-Speed Air Conditioner with Greenspeed Intelligence means: Infinity Code 34 — Indoor Coil Thermistor Issue. The Infinity System Control displays "Code 34" indicating the indoor evaporator coil temperature sensor is reporting an abnormal reading — open circuit, short circuit, or out-of-range temperature. This sensor monitors the evaporator coil temperature for freeze protection, charge management, and dehumidification control on Infinity systems. A failed sensor can cause the system to disable cooling to prevent evaporator freeze-up, or the system may operate in a limited safe mode. Check the sensor wiring at the air handler or furnace control board. The thermistor is typically clipped to the evaporator coil suction line. If the connection is secure and the issue persists, replace the thermistor ($10-$30 part). Note: if both CODE-33 and CODE-34 appear together, there may be a communication or wiring harness issue rather than individual sensor failures.

How do I fix error code CODE-34 on my Carrier Carrier 26VNA1 Infinity 21 Variable-Speed Air Conditioner with Greenspeed Intelligence?

The most successful fix is "Replace Indoor Coil Thermistor Sensor" (medium difficulty, ~45 minutes). Estimated DIY cost: $15-$30. HomeMD has 2 community-ranked fixes for this error.

Is error code CODE-34 on a Carrier Carrier 26VNA1 Infinity 21 Variable-Speed Air Conditioner with Greenspeed Intelligence serious?

This error is rated medium severity. It should be addressed soon, but your appliance may still function in a limited capacity.

Can I fix Carrier Carrier 26VNA1 Infinity 21 Variable-Speed Air Conditioner with Greenspeed Intelligence error CODE-34 myself?

Yes — the top-ranked community fix ("Replace Indoor Coil Thermistor Sensor") is rated medium difficulty and takes about 45 minutes. Tools needed: Phillips screwdriver, Electrical tape, Multimeter.

How much does it cost to repair Carrier Carrier 26VNA1 Infinity 21 Variable-Speed Air Conditioner with Greenspeed Intelligence error CODE-34?

DIY cost: $15-$30. Professional repair typically costs $120-$180. Many homeowners save money by trying the top-ranked community fix first.

What other error codes does the Carrier Carrier 26VNA1 Infinity 21 Variable-Speed Air Conditioner with Greenspeed Intelligence have?

The Carrier Carrier 26VNA1 Infinity 21 Variable-Speed Air Conditioner with Greenspeed Intelligence has 8 other known error codes, including: CODE-12 (Infinity Code 12 — No Cooling / 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-51 (Infinity Code 51 — Over/Under Charge Protection), and 3 more.

Which other Carrier models have the CODE-34 error?

Error code CODE-34 also appears on 1 other Carrier model: Carrier 25VNA Infinity Greenspeed Variable-Speed Heat Pump. 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 26VNA1 Infinity 21 Variable-Speed Air Conditioner with Greenspeed Intelligence have?

The Carrier Carrier 26VNA1 Infinity 21 Variable-Speed Air Conditioner with Greenspeed Intelligence has 8 other known error codes:

Which other Carrier models have the CODE-34 error?

Error code CODE-34 also appears on 1 other Carrier model:

Carrier 25VNA Infinity Greenspeed Variable-Speed Heat Pump (heat pump) · 2 fixes

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