Fujitsu 10 3 Error (Compressor Temperature Error)

Skylar Kaczanowski

Mar 22, 2025

Troubleshooting A Fujitsu 10-3 Error

Compressor Temperature Error

Codes will be displayed on indoor unit head on the indicator lights.

There are three lights:

Operation
Timer
Economy - Typically is flashing rapidly when there is an error occurring

To determine code:

Count each light separately
Count the operation light flashes
count the Timer light flashes

Compressor temperature error codes by model:

10x Operation & 3x Timer:

RL2 series, RLS3 series, RLS2 series, RLB/RLXB series, RLF series, RLF1 series, LUAS1 series, LMAS series, LZBS series, LZAS series, LPAS series, RGLX series, RLE series

3x Operation & 8x Timer:

RLS series, RLXS series, CQ series, RQ series, R2 series, RL series, RML series, RMLQ series, CLX series, CLX1 series, RLX series, RLXQ series, CL1 series, CL series, RLQ series

(*Operation & Timer LEDs colors are reversed) (**Refer to wired remote controller)

Continuous flash Operation & 8x flashes Timer:

ABU18RULX, ABU24RULX & ABU36RSLX

10x flashes on LED A, 3x flashes on LED B & 1x flash on LED F:

AOU36RLXFZH & AOU45RLXFZ

2x flashes on Power Mode LED, Solid Error LED, 10x flash L1, 3x flash L2, solid L5 & solid L6:

AOU30RLXEH

EA31 outdoor LED:

AOU48RLXFZ & AOU48RLXFZ1

97 / 98 / 1B Wired remote:

UTY-RNBYU, UTY-RNNUM, UTY-RVNUM, UTY-RSNUM, UTY-DMMUM & UTY-RNRUZ series, UTY-RSRY, UTY-RHRY

Compressor Temperature Error Troubleshooting Checklist

Cooling Operation:

Check of 3-way valve (gas side) was closed, open the 3-way valve and check operation.
Should that not solve the error, check if the EEV (electronic expansion valve) is defective.
Conduct a strainer check to see if the strainer is clogged. The strainer does not have temperature difference between the inlet and outlet. If there is a temperature difference as shown in figure 2, there is a possibility the strainer is clogged and would need replacing.
Inspect the condenser fan motor to see if motor spins freely with little to no resistance. If no problems are found, proceed to ohm the motor windings. If windings are not within range, motor must be replaced.
If fan ohms correctly, check the resistance of the Compressor Thermistor by ohming it out. See attached Thermistor Resistance Chart.
If above does not rectify the system of the error proceed to leak checking the system.

Heating Operation:

Check of 3-way valve (liquid side) was closed, open the 3-way valve and check operation.
Should that not solve the error, check if the EEV (electronic expansion valve) is defective.
Conduct a strainer check to see if the strainer is clogged. The strainer does not have temperature difference between the inlet and outlet. If there is a temperature difference as shown in figure 2, there is a possibility the strainer is clogged and would need replacing.
Proceed to checks 4-6 of Cooling Operation checklist to continue.

See "how to" videos below for doing the EEV, Fan Motor, and Thermistor Checks.

EEV:

https://techsupport.jswmi.com/kb/article/368-fujitsu-eev-check/

Fan Motor:

https://techsupport.jswmi.com/kb/article/791-fujitsu-outdoor-fan-motor-check/

Thermistor: