Trane Error Code CL2: Cooling, stage 2 (Air Handler)

Updated October 15, 2026 · by Aurora Star Tech Inc.

Trane error code CL2 on a air handler means: Cooling, stage 2. It is also called Trane diagnostic code CL2.

Low severityAir HandlerTrane P0V0

Homeowner? What Trane code CL2 means for you

Usually minor Your air handler is reporting: Cooling, stage 2. This code is usually informational or minor. The safe checks below often clear it; call us if it keeps showing up.

Safe things you can check yourself

Check the thermostat: right mode (Heat or Cool), set a few degrees past room temperature, and fresh batteries if it uses them.
Make sure the unit has power: its on/off switch (often looks like a light switch near the unit) is ON and the breaker in the electrical panel is not tripped.
Look at the air filter. If it is grey and clogged, replace it; a blocked filter causes many shutdowns.
Try one reset: turn the power off for 30 seconds, then back on. If the code comes back, stop resetting and call a technician.

Call (647) 657-2977 Book a service call

Licensed technicians serving Vaughan, Toronto and the GTA.

What does Trane error code CL2 mean?

Second-stage cooling call, alternating with the airflow value.

Applies to: P0V0 modular blower integrated control (IMBC)

Safety: Gas, electrical and refrigerant work must be done by a licensed technician. Turn off power and gas before servicing, never bypass a safety control, and always follow the manufacturer's manual for your exact model.

Trane models that use code CL2

P0V0A000M30SCA P0V0B000M40SCA P0V0C000M50SCA P0V0D000M50SCA

Other Trane Air Handler codes

Code	Meaning
---	Faults cleared confirmation
aRF	Calculated airflow readout (cfm x 10)
CL1	Cooling, stage 1
CoF	Continuous fan
Cr	Code release number
E01	Blower control (IMBC) internal failure
E6.1	120 V polarity reversed
E6.2	Ground not detected
E12	Control fuse open
E13	Blower HP / OEM ID mismatch
E14	No personality module and local copy bad
E15	Unit data file corrupt in module and control

All Trane Air Handler error codes →

Trane code CL2: homeowner questions

What does Trane code CL2 mean?

Cooling, stage 2. Second-stage cooling call, alternating with the airflow value.

Is it safe to keep using my air handler with code CL2?

Usually yes. Code CL2 is normally minor, but if it keeps coming back have it checked.

Can I reset Trane code CL2 myself?

You can try one reset (power off for 30 seconds, then on). If Trane code CL2 comes back, the cause is still there and a licensed technician should check it.

Who can fix Trane code CL2 near me?

Aurora Star Tech Inc. repairs Trane air handlers in Vaughan, Toronto and across the GTA. Call (647) 657-2977 or book a service call online.

Troubleshooting guides

Read or clear the last 6 faults (L6F menu) Trane · Air Handler
Reading and clearing fault history - Trane P0V0 modular blower Trane · Air Handler
Reset the control to factory defaults Trane · Air Handler
Run test mode (furnace) Trane · Air Handler

Source: Trane P0V0 modular blower installer's guide 18-GE20D1-1E-EN, IMBC Display Codes, p.30; Sequence of Operation, p.32. Written in our own words as a summary; always check the original manual.

General guidance for qualified technicians. The manufacturer's installation and service manual and local codes always take priority. Aurora Star Tech is not affiliated with, endorsed by or sponsored by any equipment manufacturer; brand and model names are used only to identify equipment and belong to their owners.