Mitsubishi Mini-Split P6 Error Code: Current Transformer Sensor Fault

Quick Answer

Mitsubishi P6 is a current protection fault. The CT sensor monitors compressor and fan motor current to detect overcurrent conditions. When it reads outside its acceptable range, the system shuts down to prevent compressor or board damage. P6 requires a licensed HVAC technician to diagnose because it involves measuring live electrical values on the outdoor unit. Do not attempt to reset and run the unit repeatedly - this can damage the compressor.

MitsubishiMinisplitSeverity: highDifficulty: advanced65% DIY Success

Time to Fix

60–240 min

Difficulty

advanced

Parts Cost

$30 – $80

Tools Needed

Clamp meter (for technician use), Multimeter

What Does the P6 Code Mean?

P6 is a CT sensor or compressor overcurrent fault. Do not keep resetting the unit. This code requires a technician to measure compressor operating current and verify the CT sensor output. Repeated resets with a failing compressor can cause permanent damage.

Most Likely Causes

Based on aggregated repair data, here is the probability breakdown for this error code:

CT sensor failure on outdoor unit40%

Compressor drawing abnormal current24%

Outdoor unit PCB fault22%

Wiring fault at CT sensor connection14%

Symptoms You May Notice

Indoor unit displays P6
Outdoor unit may not start at all
System shuts down shortly after startup
Compressor sound is abnormal before shutdown

Can you reset a Mitsubishi minisplit to clear the P6 code?

Attempt one reset only: turn off the circuit breaker for 60 seconds and back on. If P6 returns after one reset, do not continue resetting the unit. Contact a certified HVAC technician. Repeated resets with an overcurrent condition risk permanent compressor damage.

Tools Required for Diagnosis

Clamp meter (for technician use)Multimeter

Diagnostic Checklist

Follow these steps in order. We start with the easiest external fixes before opening up the machine.

Attempt a single power cycle reset

Attempt a single power cycle reset. Turn off the circuit breaker for 60 seconds and back on. Attempt to start the unit. Note whether P6 returns immediately or after a brief run period.

Do not perform further resets if P6 persists

Inform the technician of any symptoms before the fault: unusual

The technician will use a clamp meter to measure compressor

If refrigerant level is confirmed low

Replacement Parts

If your diagnostic testing proves the component has failed, you will need a replacement. We recommend OEM parts over aftermarket for water-handling components.

Part Name	OEM Number	Estimated Price
CT Sensor (current transformer)T7WE17200 (verify for your model) · $30–$80	T7WE17200 (verify for your model)	$30 – $80

Verify part fitment for your Mitsubishi model

Repair vs. Replace Calculator

Appliance Age (Years)7 Yrs

Labor Approach

Our Verdict

REPAIR

Estimated Cost: $55 (Parts) vs $1900 (New Machine)

Frequently Asked Questions

What is a CT sensor on a mini-split?

A current transformer (CT) sensor is a small donut-shaped device that clamps around a wire and measures the current flowing through it without making direct electrical contact. On a Mitsubishi mini-split, it monitors the current drawn by the compressor and fan motors to detect overcurrent conditions that could cause damage.

Why should I not keep resetting a P6 error?

If P6 is being triggered by a compressor drawing too much current, the shutdown is protecting the compressor from burning out. Repeatedly resetting and restarting the compressor under overcurrent conditions can overheat the motor windings and cause permanent internal failure, turning a $80 sensor replacement into a $1500 compressor replacement.

Can low refrigerant cause a P6 error?

Yes. When refrigerant is low, the compressor works harder to move heat, which increases its current draw. If the draw exceeds the CT sensor threshold, P6 trips. The fix is not just replacing the CT sensor - the root cause (refrigerant leak) must be found and repaired first.

How much does CT sensor replacement cost?

The CT sensor part itself is $30 to $80. Labor for an HVAC technician to access and replace it (which involves removing the outdoor unit access panels and disconnecting wiring) typically adds $100 to $200. If the compressor itself has failed, the repair cost increases significantly.

My Mitsubishi mini-split shows P6 only when it is very cold outside. What does that mean?

In heating mode at very low outdoor temperatures, the compressor works harder than in mild weather. If the compressor is at the edge of its current rating due to age, low refrigerant, or a slightly elevated voltage supply, it may trip the CT sensor only under these high-demand conditions. Have a technician check refrigerant level and compressor health.

Related Mitsubishi Minisplit Error Codes

Code: HUBMitsubishi Mini-Split Error Codes: Complete MSZ and MXZ Series Guide Code: RESETMitsubishi Mini-Split Error Codes: Complete MSZ and MXZ Series Guide

Same Fix on Other Brands

Daikin E3:

Models Known to Experience P6 Errors

This repair applies to most Mitsubishi minisplits with this error code. Common model numbers include:

MSZ-GL12NA, MSZ-FH12NA, MSZ-FS12NA, MXZ-2C20NAHZ

Last verified for technical accuracy on March 14, 2026