The short answer
The order that matters here is an old shut-off or saddle valve first, the water supply to the unit next and the fill valve last. Age moves this ranking: on a machine that has outlived several kitchens, the parts that have been working longest come before the electronics, of which there is very little to fail. That ranking is the value of this page: the cheap causes are the common ones on Simplex refrigerators, and the costly one is what people reach for first.
What you observe
- A stale taste to the ice — Old ice absorbs odours. It is a sign of very slow production rather than a fault in itself.
- The maker buzzes but nothing comes out — The fill valve is being told to open and no water is passing.
- It stopped right after the filter was changed — A filter not seated, or an air lock that has not been purged, will stop production immediately.
- NEAR MISS — water at the dispenser but no ice — Water reaching the door proves the supply, which moves the diagnosis into the freezer side entirely.
Causes, most likely first on Simplex
- An old shut-off or saddle valve — The valve that taps the supply for an older unit has often been in place for decades. Saddle valves in particular silt up around the piercing pin and slowly close themselves, giving a fill that gets shorter every year. Ranked first on Simplex: it leads here because a slow decline over years points at the plumbing rather than at the appliance.
- The water supply to the unit — Everything starts at the shut-off valve behind or under the unit. Kept just below the point above rather than dropped, because it is outside the appliance, costs nothing to check, and accounts for more stopped ice makers than anything inside the cabinet.
- A freezer that is not cold enough — An ice maker will not run a harvest cycle until the mould has reached its release temperature. Third on this brand: this belongs above the mechanical causes because a warm freezer stops a perfectly healthy ice maker.
- The fill valve — The valve that lets water into the mould is a solenoid at the back of the unit. Last: this position keeps a part replacement below the two free checks that make it unnecessary most of the time.
Check in this order, and why
- First: Look at the valve, not just the appliance — An old saddle valve that has silted up gives a fill that has been getting shorter for years. It is first because it is the cheapest of the three to settle.
- Second: Check the shut-off valve and the line — Make sure the valve is fully open and the line is not crushed where the unit was pushed back.
- Third: Measure the freezer temperature — A freezer holds food safely at 0 °F (−18 °C) or below; above that, ice production suffers first.
What an owner can safely check
- Open the valve fully and straighten the line — Pull the unit out, check the valve is fully open, and free any kink in the supply line. Get a second person before you pull the cabinet out or tilt it.
Tools: torchAbout 20 min
- Put a thermometer in the freezer and read it — Leave a freezer thermometer between packages overnight and read it before opening the door.
Tools: freezer thermometerAbout 30 min
- STOP HERE if the next step needs a meter on live terminals — That is the line between an owner check and a service call, and it is not worth crossing.
Before any panel comes off
Safety
Unplug the appliance or switch off its breaker before removing any panel, and treat every capacitor as still charged: a capacitor can hold a charge after the power is off. Secure or remove the doors before moving a unit, get help with the lift, and never lay a refrigerator on its back. Do not put a heat gun anywhere near a cabinet full of plastic.
When to call a technician
The owner side of this is the valve, the filter, the arm and a thermometer. Past that it is a service call.
Nearest pages of this class
What this page does not cover
This is generalized information for Simplex refrigerators as a class, not for one family or one model. No family- or model-specific page for this brand and appliance is published here yet, so nothing narrower is linked; when one is, it becomes the more specific answer and this page will point to it. Deliberately absent: part numbers, wiring colours and the order the panels come off in — those belong with a named family.
