Fujitsu Air Conditioner Power Transformer — AST14RVACW, AST14RVBCW, AST17RVACW

Replacement mains control transformer for Fujitsu air conditioners — Fujitsu General type EZ-030HSE-T, 230 V, 10 W, from the AST7A / RSB-W platform. It is the small transformer on the indoor unit that steps 230 V mains down to the low voltage the control PCB runs on. When it fails the indoor unit is simply dead.

OEM Genuine. This part is made by the original equipment manufacturer - the same factory that produces it for the brand - and carries their part number. It is the same component, supplied without brand-name retail packaging, which is why it costs less than buying the boxed part through the brand.
Mains voltage — qualified technician only.
This part sits on the 230 V side of the indoor unit. Installation is refrigeration/electrical trade work: isolate at the switchboard first. Note also that a burnt-out transformer is very often a symptom, not the cause — a shorted control PCB or fan motor will destroy the new one too. Check the load before you fit a replacement.

Part Numbers

Fujitsu General part number 9701803026. Transformer type marking EZ-030HSE-T. Platform code AST7A / RSB-W. Also written as 970-180-3026 and K9701803026 in some catalogues.

Do not confuse with: other Fujitsu transformers also marked EZ-030HSE-T carry different part numbers — 9701161010 and 9900028015 among them. No manufacturer source states these are interchangeable with 9701803026, so order by the part number and your model number, not by the type marking alone.

Fits These Models

AST7FSACWAST7LMACWAST7USACWAS7TFDMFAS7TFEMFAS7UFADRAST9ASHCWAST9ASJCWAST9FSACWAST9LMACWAST9PSACWAST9RSHCWAST9USACWAST9FMBDAST9UMADAST9UMBDAS9TFDMFAS9UFADRAST12ASHCWAST12FSACWAST12LMACWAST12RSHCWAST12RSJCWAST12USACWAS12TFDMFAS12UFADRAST14RVACWAST14RVBCWAST17RVACWAS14TFDMFAS14UFADRASTA07JCCASTA09JCCASTA12JCCAOT13PNACASY9FSBCWAOY9FSBCASY12FSBCWAOY12FSBC

Brand: Fujitsu / Fujitsu General. Appliance type: split system air conditioner, wall mounted indoor unit and matched outdoor unit. The ASY / AOY models above are confirmed against a Fujitsu service manual parts list; the AST, AS, ASTA and AOT models come from the Fujitsu spare parts fitment catalogue.

Symptoms Of A Failed Transformer

  • Indoor unit completely dead — no display, no beep, no response to the remote.
  • Mains present at the indoor terminal block but nothing on the control PCB.
  • Operation and timer LEDs not lighting at all.
  • Buzzing or humming from the transformer, or a burnt varnish smell.
  • Visible scorching, swelling or discolouration of the winding.
  • Open circuit across the secondary winding when measured with a meter.
  • Control fuse blowing repeatedly.

Specifications

Type: EZ-030HSE-T mains control transformer
Primary: 230 V a.c., 50 Hz
Rating: 10 W
Position: indoor unit control PCB power supply
Platform: AST7A / RSB-W
Brand: Fujitsu General (OEM)

Before You Order

  1. Read the model number from the rating plate on the indoor unit, not from the remote or the outdoor unit.
  2. Check it against the model list above.
  3. If your model is not listed, send us the model number and we will confirm fitment before you buy.
  4. Photograph the existing wiring before you disconnect anything.
  5. Diagnose why the old one failed before fitting the replacement.

Product images on this listing are a specification and fitment card, not a photograph of the item supplied.

Why Buy From Us

  • Australian stock, dispatched from our Sydney warehouse.
  • Same business day dispatch on orders placed before cut-off.
  • 12 month warranty.
  • Appliance and air conditioning spares specialists — talk to someone who knows the part.
AIRLINK
SKU FUJ_9701803026_14
Model # 9701803026
Brand Fujitsu
Shipping Weight 1.0000kg