e7
Moderate
Mitsubishi Electric · Mini-Splits & Ductless Systems
Outdoor Unit Communication Error
Quick Answer
Error code E7 on your Mitsubishi Electric Mini-Splits & Ductless Systems means: Outdoor Unit Communication Error. This is usually fixable — see the step-by-step guide below.
Likely Causes
How to Fix It
1
Power cycle the system at the circuit breaker for 60 seconds
2
Verify proper voltage at the outdoor unit terminal block (208-230VAC)
3
Inspect the outdoor PCB for visible damage such as burn marks or bulging capacitors
4
Check all communication wiring connections in multi-zone systems at each branch box and indoor unit
5
Outdoor PCB replacement requires a Mitsubishi Diamond Contractor or licensed HVAC technician
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
Outdoor PCB
Communication cable
Surge protector
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