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E6: Indoor/Outdoor Communication Error (Mitsubishi)

Mitsubishi heat pump indoor unit and outdoor unit have lost communication between each other.

What This Error Code Means

The data transmission between the indoor and outdoor PCBs has been interrupted.

Common Causes

  • Interconnecting cable damaged
  • Terminal connection loose
  • Outdoor PCB failure
  • Indoor PCB failure
  • Noise interference on communication line

Affected Brands

Mitsubishi

How ROMA Heating Fixes This

  • Check interconnecting cable continuity
  • Verify all terminal connections are tight
  • Inspect for voltage on communication lines
  • Test indoor and outdoor PCBs
  • Replace damaged components

Why Trust ROMA Heating

24/7 Emergency

True round-the-clock service including weekends and holidays

Licensed Technicians

TSBC licensed and trained on all major heat pump brands

Fast Diagnosis

We know exactly how to interpret and resolve error codes

Related Services

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