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E251: Communication Error Between Units (Samsung)

Samsung heat pump communication loss between indoor and outdoor units.

What This Error Code Means

The main control board cannot establish communication with the outdoor unit assembly.

Common Causes

  • Communication wiring damaged
  • Terminal block connection loose
  • Outdoor PCB power failure
  • Indoor PCB failure
  • Wiring polarity incorrect

Affected Brands

Samsung

How ROMA Heating Fixes This

  • Check communication wiring continuity
  • Verify power at outdoor unit
  • Check terminal connections
  • Test indoor and outdoor PCBs
  • Replace faulty PCB or repair wiring

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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