Fujitsu · Heat pump

52 Indoor electronic expansion valve error

High severity Fujitsu ductless split/multi/VRF (general code list)

What the control is telling you

Indoor EEV coil or valve fault. Indoor lamps: OPERATION (green) flashes 5x, TIMER (orange) flashes 2x, ECONOMY (green) flashes fast nonstop; wired remote shows 52.

Applies to: Fujitsu ductless heat pumps: Fujitsu ductless split/multi/VRF (general code list)

Likely causes

EEV coil open or unplugged
Valve stuck

Test and repair steps

Check EEV coil connector and resistance.
Replace coil or valve as needed.

Settings for these units

Operating range and service space · Fujitsu multi-zone outdoor 18/24 type

Other codes on the same units

35 MANUAL AUTO button error
41 Room (intake air) temperature sensor error
42 Indoor coil (heat exchanger middle) sensor error
51 Indoor fan motor error
53 Drain pump error
57 Damper error
58 Intake grille error
62 Outdoor main PCB error (EEPROM / model / micro comms)

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Source: Fujitsu All Fujitsu split - multi - VRF (generic code list) codes.pdf - section error code table (indoor LED flashes). 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.