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Fujitsu · Heat pump

53 Drain pump error

Medium severity Fujitsu ductless split/multi/VRF (general code list)Fujitsu wall-mounted 7-15 (NA ASU/AOU type)Fujitsu slim duct ARU 7-18 (LL type)

What the control is telling you

Condensate is not being removed by the drain pump (float stays high). Indoor lamps: OPERATION (green) flashes 5x, TIMER (orange) flashes 3x, ECONOMY (green) flashes fast nonstop; wired remote shows 53.

Applies to: Fujitsu ductless heat pumps: Fujitsu ductless split/multi/VRF (general code list), Fujitsu wall-mounted 7-15 (NA ASU/AOU type), Fujitsu slim duct ARU 7-18 (LL type)

Likely causes

  • Blocked drain line or pan
  • Drain pump failed
  • Float switch fault

Test and repair steps

  1. Warning: Check for water overflow before resetting.
  2. Clear the drain pan and line.
  3. Test pump and float switch; replace the failed part.
  4. On ducted units without a pump, DIP SW101-1 must be set to disable the drain function.

Settings for these units

Other codes on the same units

  • 42 Indoor coil (heat exchanger middle) sensor error
  • 44 Human (occupancy) sensor error
  • 51 Indoor fan motor error
  • 52 Indoor electronic expansion valve error
  • 57 Damper error
  • 58 Intake grille error
  • 61 Outdoor reverse / missing phase or wiring 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); Fujitsu Wall-mounted 7-9-12-15 (North American trilingual, UTY-RNNUM remotes; e.g. ASU9-12-15 RLF1-RLS familie.pdf - section 14 Error codes; Fujitsu Slim duct AR07-09-12-14-18 (ARU-ARYG LL-type equivalent) installation P-N 9381858064.pdf - section 14 Error codes. 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.