e6
Moderate
Mitsubishi Electric · Mini-Splits & Ductless Systems
Indoor/Outdoor Communication Error
Quick Answer
Error code E6 on your Mitsubishi Electric Mini-Splits & Ductless Systems means: Indoor/Outdoor Communication Error. This is usually fixable — see the step-by-step guide below.
Affected Models
Applies to all models
Likely Causes
How to Fix It
1
Check all wiring connections at the indoor and outdoor unit terminal blocks and tighten as needed
2
Verify the communication wire has continuity between the units using a multimeter
3
Confirm the wiring matches the wiring diagram exactly (polarity matters on communication wires)
4
Inspect the cable for physical damage along its entire run
5
If wiring checks out, a licensed HVAC technician should test the communication circuits on both PCBs
Pro Tip
This fix requires some technical knowledge. If you're unsure about any step, consider contacting support or a qualified technician.
Parts You May Need
Interconnecting wire cable
Indoor PCB
Outdoor PCB
Terminal connectors
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