Midea · Heat pump

EL16 Main board to transit board communication error

High severity Midea DLCURA ducted single-zone inverter heat pump (outdoor)

What the control is telling you

The outdoor main board is not communicating with the outdoor transit board.

Applies to: DLCURAH18-60 AAK/ABK single-zone heat pump outdoor units (18K-60K, regular and High Heat)

Likely causes

Loose or damaged internal cable between outdoor boards
Faulty transit board
Faulty main board

Test and repair steps

Warning: Turn off and lock out power at the outdoor disconnect and wait for the inverter capacitors to discharge before touching the outdoor board or compressor wiring.
Locate the communication cable between the outdoor main board and transit board and reseat both ends.
Inspect the cable for damage.
If the error remains, replace the transit board or main board per the service manual.

Settings for these units

Outdoor unit minimum clearances · Midea DLCURA ducted single-zone inverter heat pump (outdoor)

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Source: Midea/Carrier DLCURA Installation Instructions (Catalog DLCURA-03SI), Table 11 Outdoor Unit Diagnostic Codes, p.19. Summarized in our own words; check the original manual for your model.

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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.