Appliance Spares
Quick answer: a Whirlpool (or Amana / Maytag) fridge that slowly ices up at the back of the freezer while the fridge compartment warms has lost its automatic defrost — and on these brands the classic culprit is the defrost timer: the small motorised switch that pauses cooling a few times a day to melt frost off the evaporator. When it sticks, frost grows into an ice wall, blocks the airflow, and the fridge side starves of cold air.
Find the defrost part for your fridge
The icing-up pattern
- Week 1: freezer back panel grows a frost layer that never clears.
- Week 2–3: fridge compartment runs warmer — the iced evaporator can’t push cold air up.
- The compressor runs almost constantly, and the power bill notices.
- Defrost it manually with the door open for a day and everything works — for a fortnight. That recovery-then-relapse loop is the timer’s signature.
Timer, heater, or thermostat?
Auto-defrost has three players, and each fails differently:
| Part | Failure signature |
|---|---|
| Defrost timer | Never enters defrost — steady ice growth, full recovery after manual thaw. The most common failure on this platform. |
| Defrost heater | Timer clicks into defrost but nothing melts — ice keeps winning. See our defrost heater guide. |
 Defrost (bi-metal) thermostat | Defrost runs but cuts early or never ends — partial melts, sometimes water leaks. The bi-metal thermostat is a $20-class part. |
The parts we stock:
- Refrigerator defrost timer — Whirlpool / Maytag / Amana / Fisher & Paykel
- Whirlpool defrost bi-metal thermostat
- Whirlpool fridge thermostat — BFD series
- GE / Whirlpool / Amana / Maytag fridge fan motor
Swapping the timer
The timer lives behind the kick panel or inside the control housing depending on series — a small box with four terminals and, on many, a manual-advance slot. Unplug the fridge, photograph the wiring, swap plug-for-plug. With a screwdriver in the advance slot you can also force defrost as a test: if forced defrost melts the ice and the fridge recovers, you’ve proven the timer was never asking for it.
| Path | Typical cost |
|---|---|
| Technician callout + timer + labour | $280–$420 metro |
| DIY timer swap | Part only — 30 minutes |
Frequently asked questions
Water pooling under the crisper drawers too — same fault?
Usually — meltwater from partial defrosts overwhelming a drain that’s icing over. Fixing the defrost cycle usually dries it up.
How often should a healthy fridge defrost?
Two to four times a day, briefly — you sometimes hear soft sizzling as the heater meets frost. Never hearing anything for weeks while ice grows is the giveaway.
My fridge is frost-free — how can it have frost?
“Frost-free” just means the defrost system removes it automatically — the frost still forms. When defrost dies, frost-free fridges frost faster than old ones.
Where’s the model number?
Inside the fridge compartment on the side wall or behind a crisper. Run it through the Part Finder for the exact timer.
Related guides
Ready to fix it?
- Run your model number through the Oz Appliance Spares Part Finder — model in, exact-fit part out.
- Browse 3,000+ parts in stock
- Order before 12pm Sydney time → ships same day from our Sydney Northern Beaches warehouse, Australia-wide.
Disclaimer: this article is general information only and is provided without warranty of any kind. Appliance designs vary between models and production runs — always follow the manufacturer’s instructions, switch off and unplug the appliance before starting any work, and confirm parts against the model number on your appliance’s model sticker. Any repair is undertaken at your own risk and Oz Appliance Spares accepts no liability for injury, loss or damage arising from work performed after reading this guide, to the maximum extent permitted by law. If in doubt, use a qualified technician.
