j3
Easy Fix
Daikin · Mini-Splits & Ductless Systems
Discharge Pipe Thermistor Fault
Quick Answer
Error code J3 on your Daikin Mini-Splits & Ductless Systems means: Discharge Pipe Thermistor Fault. This is usually fixable — see the step-by-step guide below.
Likely Causes
How to Fix It
1
Locate the discharge pipe thermistor on the compressor discharge line
2
Verify it is securely mounted to the pipe with proper insulation tape or clamp
3
Measure the thermistor resistance and compare to the Daikin temperature-resistance chart
4
Check the connector at the outdoor PCB for corrosion or loose contact
5
Replace the thermistor if resistance readings are out of specification
Pro Tip
This is a common issue that most users can resolve without specialized tools. Try the first step before moving on to more complex solutions.
Parts You May Need
Discharge pipe thermistor
Insulation tape
Wire connectors
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