Appliance Spares
Quick answer: A fridge that runs too warm — or one freezing the lettuce at the back — usually comes down to one part: the thermostat. On older Westinghouse, Kelvinator, Electrolux, Haier and Lemair fridges it is a mechanical capillary-tube control that drifts with age, and a replacement typically lands between $20–$90 against a $100–$165 call-out before parts. It sits outside the sealed gas system, so on many fridges it is a realistic DIY swap. What matters is matching the part number to the model number on your model sticker.
Last updated August 2026
Two opposite symptoms, one usual suspect
The milk is borderline. Or the exact opposite — the lettuce at the back of the crisper comes out frozen solid and the eggs have ice crystals in them. Opposite complaints, same usual culprit: the temperature control, better known as the thermostat.
There is a third version of the fault: the fridge that never shuts up. If the compressor hums around the clock, the thermostat has likely lost its ability to sense “cold enough” and never switches off. That costs you on the power bill daily — and it is far better fixed now than in December, when the fridge is fighting 35-degree air.
Match the part number to your fridge
Fridge thermostats are not interchangeable — capillary tube length, bracket, terminals and switching temperatures are all tuned to one cabinet family. Here are four controls we keep on the shelf, and the machines they belong to.
| Part number | The part | Fits these models |
|---|---|---|
 1409938 (0570) | Westinghouse Kelvinator Electrolux fridge thermostat 1409938 | A long list of cyclic-defrost Westinghouse, Kelvinator and Electrolux cabinets — confirm it against the model number on your model sticker before ordering |
 HR04X00008 | Haier fridge thermostat HR04X00008 | Haier HRFZ-213 family: HRFZ-213, HRFZ213SS, HRFZ213 and TWLTRF-200 |
 20060340 (0597) | Lemair upright freezer thermostat 20060340 | Lemair FR90VN upright freezer |
 SEA00092DA | Isotherm Cruise Elegance thermostat kit SEA00092DA | Isotherm CR42EL, CR49EL, CR65EL, CR85EL and CR130EL boat and caravan fridges |
That last row is worth a second look if you own a caravan or a boat: marine and RV compressor fridges drift out of calibration just like kitchen ones, and we walk through that exact job in our Isotherm Cruise Elegance thermostat guide.
Your model number lives on the model sticker — usually inside the fresh-food compartment, behind the crisper bins, or on the rear panel. If you cannot find it, our find-your-model page shows where each brand hides it. Then either search the part number, browse the fridge parts range, or run the part finder and let it narrow things down.
How a capillary-tube thermostat actually works
The mechanical fridge thermostat is a lovely bit of pre-electronic engineering. A thin copper capillary tube runs from the control body to the evaporator or the cold air path, charged with a small amount of gas. As the fridge warms, the gas expands and pushes on a diaphragm inside the control; at a set pressure the diaphragm snaps a switch and the compressor kicks on. Cool down far enough and it snaps back off. The dial simply changes the spring tension the diaphragm has to fight.
Age attacks it two ways. The gas charge can slowly leak down, so the control thinks the cabinet is colder than it is — the compressor barely runs and the fridge sits warm. Or the spring and contacts wear so the cut-out drifts colder — the compressor over-runs and your salad greens come out as garnish-flavoured ice blocks. Either way, the fix is the same part.
The dial is a setting, not a thermometer
Honesty time: the numbers on a fridge dial are not degrees. Three is not a temperature, it is a vibe. A higher number just means more spring tension, longer compressor runs and a colder cabinet. The only way to know what your fridge is actually doing is a $10–$20 fridge thermometer in a glass of water on the middle shelf overnight. You are aiming for 3–4 degrees in the fresh-food section and about minus 18 in the freezer.
That thermometer is also your diagnostic tool: dial at its normal position but the water reading 8 degrees, or the crisper at freezing point, is evidence — not a hunch.
Rule it in before you spend a dollar
A few free checks first, because not every warm fridge is a thermostat:
- Listen for the click. With the fridge quiet, slowly rotate the dial from minimum to maximum. A healthy thermostat gives a firm click and the compressor starts. No click at any position on a powered fridge is a strong sign the control is dead.
- Check the compressor pattern. Normal is a cycle: run for a stretch, rest for a stretch. Running 24/7, or barely running at all while the cabinet sits warm, points at the control.
- Frost-free caveat. On a frost-free two-door fridge, a warm fresh-food section with a cold freezer can also be a failed defrost system or a blocked air damper — check the freezer’s back panel for a wall of ice before blaming the stat. Our guide to what actually fails in fridges walks the whole fault tree.
- Basics. Door seals sealing, vents inside the cabinet not buried under shopping bags, and a hand-span of breathing room behind the cabinet.
One more distinction: this article is about mechanical controls with a dial. Late-model electronic fridges use thermistor sensors and a control board instead — if you own one of those, start with our Fisher & Paykel temperature sensor 855203P guide, because the fix is a sensor, not a stat.
The swap: an honest look at the job
On many older fridges the thermostat is one of the most accessible parts in the machine. It usually lives behind the dial housing inside the cabinet, held by a couple of screws, with two or three spade terminals and the capillary tube clipped along the cabinet wall.
- Unplug the fridge at the wall. Not standby — unplugged.
- Unclip or unscrew the control housing and photograph the wiring before anything comes off.
- Transfer the wires one at a time to the same terminals on the new control.
- Feed the new capillary tube along the same route as the old one, gently — do not kink it, do not snap it, and never cut it “to tidy it up”. The tube is the sensor.
- Refit the housing, plug in, set the dial mid-range, and check with your thermometer over the next day.
Most of the controls above sit in the $20–$90 band, while a repairer’s call-out and diagnosis typically runs $100–$165 before the part and labour enter the conversation. On a plug-in fridge with a terminal-for-terminal swap, this is a legitimate weekend job for a careful owner. If anything about the wiring looks unusual, stop and hand it to a repairer — no shame in that.
The line you do not cross: the sealed system
Clear and non-negotiable: the sealed refrigeration system — compressor, refrigerant gas, condenser and evaporator piping — is licensed territory. In Australia, handling refrigerant legally requires a licensed refrigeration mechanic; there is no DIY version of that job. If the thermostat clicks and the compressor runs but the cabinet still will not pull down to temperature, the fault has likely moved into the sealed system, and the right move is a repairer’s opinion — often followed by an honest chat about whether an old cabinet is worth regassing at all.
The good news is that the thermostat lives entirely outside that sealed loop. Swapping it breaks no gas circuit and needs no licence on a plug-in fridge — which is exactly why it is the one cooling repair a home fixer can genuinely own.
Frequently asked questions
Q: How do I know it is the thermostat and not the gas?
A: Do the cheap tests first. No click at any dial position, or a compressor that never cycles off, points at the thermostat. If a good thermostat clicks and runs the compressor but the fridge still cannot reach temperature, suspect the sealed system — that repair belongs to a licensed refrigeration mechanic.
Q: Can I legally replace a fridge thermostat myself in Australia?
A: On a plug-in fridge, yes — the thermostat is a replaceable control outside the sealed gas system, swapped with the appliance unplugged. Anything involving refrigerant, the compressor or brazed piping requires a licensed person. If your fridge is hard-wired or the wiring looks unfamiliar, use a repairer.
Q: Why is food freezing at the back of my fridge?
A: The rear wall sits closest to the evaporator, so it is the coldest spot in the cabinet, and a drifted thermostat that over-runs the compressor freezes food there first. Check the dial has not been bumped to maximum, then measure the true temperature with a thermometer in a glass of water.
Q: What do the numbers on the fridge dial actually mean?
A: They are relative settings, not degrees. A higher number means longer compressor runs and a colder cabinet. Aim for a measured 3–4 degrees in the fresh-food section; if you cannot reach that on any setting, the control has likely drifted and needs replacing.
Q: Will any thermostat fit my fridge?
A: No. Capillary tube length, cut-in and cut-out temperatures, brackets and terminals all differ between cabinets. Match the part number printed on the old control, or the model number on your model sticker — send it through and we will check the match before you order.
Get the right stat, not a near enough one
Open the door, find the model sticker, and copy the model number exactly — letters, digits, dashes, all of it. Search it against the part numbers above, or send it through our contact page and we will match the thermostat to your fridge before you spend a cent. Ordered by 12pm, it is picked, packed and on its way from Sydney’s Northern Beaches that afternoon — which means the fridge is back to cold milk and unfrozen lettuce well before the first warm weekend of spring.
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.
