Fujitsu Error Code E5:00: Indoor Coil Sensor Short
Severity
Warning
Type
digital display
Estimated repair cost:$100 — $250(parts + labor)
Warning: The unit has detected a short in the indoor coil temperature sensor and has shut down to prevent damage. The unit will not operate until this is resolved.
How to Fix Fujitsu Code E5:00
Step 1: Turn the unit off and then back on. Sometimes a simple reset can clear a temporary error.
Step 2: Check the wiring connections at the indoor unit where the wires enter the unit. Look for any obvious signs of damage or loose connections. Do not open the unit, just visually inspect the external wiring.
Step 3: If the error persists after resetting and checking the external wiring, contact a qualified HVAC technician to diagnose and repair the issue.
How to Reset Fujitsu Code E5:00
Turn off the unit using the remote control or wall controller.
Turn off the circuit breaker for the outdoor and indoor units. Wait 60 seconds.
Restore power at the breaker.
Turn the unit on with the remote control. If the error returns, the fault needs professional diagnosis.
What does E5:00 mean?
The E5:00 error code on your Fujitsu mini-split indicates a problem with the temperature sensor located on the indoor coil. This sensor monitors the coil's temperature to prevent freezing during cooling or overheating during heating. A 'short' means the sensor is sending an incorrect signal to the control board, suggesting an extreme temperature even if the coil is not actually that hot or cold. Because the system can't reliably monitor the coil temperature, it shuts down to prevent potential damage to the compressor or other components. This isn't a dangerous situation like a gas leak, but it does mean your system won't provide heating or cooling until the issue is fixed. A faulty sensor, wiring issues, or even a problem with the main control board can trigger this error.