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Gree · Heat pump

dn Wrong interconnect wiring or EEV fault

Medium severity Gree Multi21+

What the control is telling you

The outdoor unit found the communication wires and piping of a zone do not match, or an expansion valve is faulty.

Applies to: Gree Multi21+ 18-24k multi-zone (MULTI..HP230V1CO)

Likely causes

  • Interconnect wires of a zone crossed with another zone's pipes
  • EEV coil or valve fault

Test and repair steps

  1. Check that each zone's wiring and piping go to the same indoor unit.
  2. Check EEV coils and plugs for each zone.

Models that show this code

2 models in Gree Multi21+

MULTI18HP230V1COMULTI24HP230V1CO

Other codes on the same units

  • HC PFC protection
  • LC Compressor failed to start
  • LP Indoor and outdoor units do not match
  • Ld Compressor phase loss
  • PH DC bus voltage too high
  • PL DC bus voltage too low
  • PU DC bus capacitor charging fault
  • dd Wiring/EEV check running (status)

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Source: Gree Multi21+ multi-zone 18-24k (MULTI18-24HP230V1CO) service.pdf - section 9.1 Malfunction status sheet / 9.2 Malfunction Checking and Elimination. Summarized in our own words; check the original manual for your model.

Homeowner looking at this code? See what it means for you and when to call a technician.

For licensed technicians. Gas, electrical and refrigerant work must be done by a qualified, licensed person. Shut off power and gas before servicing, never bypass a safety control, and follow the manufacturer’s manual for the exact model; it and local codes always take priority. HVACopedia is not affiliated with any manufacturer; brand and model names only identify the equipment.