95Fujitsu · ASTG09 / ASTG12 / AOTG09 / AOTG12 KMTC · Mini Split

Fujitsu ASTG09 / ASTG12 / AOTG09 / AOTG12 KMTC error code 95

Compressor rotor position detection error

Needs attention soon

Also written as rotor position, compressor start, code 95

Quick answer

On Fujitsu ASTG09 / ASTG12 / AOTG09 / AOTG12 KMTC, 95 is a fault. It means compressor rotor position detection error. A first thing to check: A failed inverter assembly that cannot measure rotor position.

Applies to: Fujitsu ASTG09 / ASTG12 / AOTG09 / AOTG12 KMTC; Fujitsu GENERAL AIRSTAGE KMTC wall split codes, indoor and outdoor · Mini Split
Type of code: Fault; Urgency: Needs attention soon
First safe check: Measure the compressor winding resistance and compare it with the documented 1.975 Ohm at 25 C across all three pairs.

Checked 2026-09-26

What 95 means on this model

The unit has lost track of where the compressor rotor is, so it cannot start the motor and has stopped. The drive has to establish rotor position before it will run the compressor, and when that measurement is wrong or missing the motor will not start. A failed inverter assembly, a compressor that can no longer be measured correctly, a wiring problem at the compressor, or a supply outside the available range all produce it, and it is closely related to the inverter and current sensor codes.

Symptoms you will notice

Code 95 and the system will not start
The compressor does not run or drops out immediately
The fault appeared after a power interruption
Inverter and current sensor codes appear alongside it

Common causes

The code tells you what the control detected, not which part failed. These are the causes we see most often, roughly in order of likelihood:

A failed inverter assembly that cannot measure rotor position
A compressor that has weakened or failed
A loose or corroded compressor connector
A supply voltage problem
A wiring fault in the compressor connection

What you can safely check

These are homeowner-level checks. None of them need you to open a live electrical compartment or work on gas.

Measure the compressor winding resistance and compare it with the documented 1.975 Ohm at 25 C across all three pairs.
Confirm the supply voltage is inside 198 to 264 V.
Check the compressor connector for a loose or corroded pin, and check the outdoor unit supply connector, since both are disturbed on any service to the outdoor unit.

Do not do these

×Do not keep attempting to start the compressor. A compressor the drive cannot position is being driven against its own start and will damage the drive.
×Do not replace the compressor without proving the supply voltage, because a marginal supply destroys the replacement.
×Do not work on the compressor terminals with the power switch on.

When to call a technician

Book a technician, do not keep resetting it

This fault will not clear on its own. Every power cycle gives the control one more failed attempt, and repeated attempts are what turn a cheap part replacement into a seized or contaminated system.

The refrigerant circuit is sealed and legally requires licensed handling. Opening it without certification releases refrigerant and can put the whole system in violation of regulation, so a low-pressure or high-pressure fault on this equipment is a call-out, not a weekend job.
If the appliance has stopped mid-cycle, is making a noise you have not heard before, or smells burnt, stop reading here and call. Those are symptoms of something the fault code does not describe well enough.

A licensed technician job.

What it costs to fix

Parts

Inverter assembly $600 to $1,400. Compressor $1,400 to $3,000.

Labor

Four to eight hours including recovery, replacement and recharge.

DIY or technician