The Most Common Causes
Ranked by how often this kind of fault turns out to be each one. A list isn’t a diagnosis — that takes someone looking at your specific machine — but it’s worth knowing what’s on the menu before anyone quotes you.
Frozen Fill Tube
The thin tube feeding water into the ice mould ices over, usually after a slow drip from a worn inlet valve or a door left ajar. Water can’t reach the mould, so the maker cycles on an empty tray forever. Thawing it clears the symptom — but if the valve is what caused the drip, it comes right back, so the tube is a clue rather than the whole answer.
Failed Water Inlet Valve
An electrically operated valve at the back of the fridge that opens to let water in. They fail two ways: stuck shut (no ice at all) or weeping (small hollow cubes, plus the frozen fill tube above). A valve needs adequate household water pressure to open properly, so a half-closed shutoff behind the fridge produces identical symptoms.
Clogged Water Filter
A filter well past its service life restricts flow enough that the mould never fills properly. You get small, hollow or crescent-shaped cubes before you get none. Worth checking early because it’s the cheapest thing on the list and requires no tools.
Freezer Running Too Warm
Ice makers need the freezer genuinely cold — around −18°C — before the mould thermostat will trigger a harvest. A freezer sitting at −12°C keeps food frozen and feels fine to the hand, but the ice maker simply never cycles. This one gets misdiagnosed constantly, because nothing looks broken.
Ice Maker Module or Thermostat
The motorised head that sweeps cubes out and signals for a refill. When the module or its internal thermostat fails, everything else in the chain works and nothing happens. Usually replaced as an assembly rather than repaired piece by piece.
Shutoff Arm or Optical Sensor
Every ice maker has a way to stop when the bin is full — a wire arm on older units, an infrared beam on newer ones. A nudged arm or a beam blocked by a stray bag reads as “bin full” permanently. Free to fix, and more common than you’d think.
Before You Call
Worth ruling out first. If one of these is the answer you’ve saved yourself a service call, and if none of them are, the diagnosis starts from a better place:
- Is the shutoff arm down, or the sensor clear? A raised arm or blocked beam tells the maker to stop. Costs nothing to check and resolves a fair share of calls.
- Check your freezer temperature with a thermometer. Not the display — an actual thermometer left in there. If it’s warmer than about −18°C, that alone can explain no ice.
- When was the water filter last changed? If you can’t remember, that’s your answer. Restricted flow shows up as small or hollow cubes first.
- Look for a thin sheet of ice under the mould. That’s the frozen-fill-tube signature. A hair dryer on low will thaw it — and if ice returns within days, the inlet valve is weeping and needs replacing.
- Confirm the water line behind the fridge is fully open. Fridges get pulled out for cleaning and the saddle valve gets bumped. Half-open reads exactly like a failed valve.
In Calgary
Two local wrinkles worth knowing. Calgary’s water comes from the Bow and Elbow rivers, and hardness varies by quadrant and season — roughly 125–260 mg/L, with the Elbow-fed south generally harder and winter running harder than spring melt. Scale builds inside inlet valves and fill tubes, which shortens their life — so hard-water cities see more weeping valves than soft-water ones. And in older Bowness, Bridgeland, Inglewood and Killarney homes, fridge water lines were often added long after the house was built, sometimes with a saddle valve that was never great to begin with and is now a decade past its best.
Why a Real Diagnosis Matters
Several causes on the list above produce an identical symptom, and they sit at very different price points. That’s the whole argument for testing rather than guessing — a wrong part fitted confidently still leaves you with a broken appliance and a smaller bank balance.
What a Proper Diagnosis Does
- Tests water arrival before replacing parts. If water reaches the mould, the valve and filter are fine and the problem is electrical or thermal. That single check eliminates half the possible causes in about a minute.
- Distinguishes “no ice” from “bad ice.” Hollow, small or slow cubes point at flow restriction. No cubes at all points at signal or temperature. They’re different repairs and confusing them is how people end up buying a module they didn’t need.
- Checks the freezer’s actual temperature. A warm freezer explains no ice and also predicts a second call about soft ice cream. Worth catching in one visit.
- Tells you when replacement beats repair. On some models the ice maker assembly costs enough that on an older fridge it isn’t the right spend. We’d rather say so.
What the Repair Typically Costs
Kodiak quotes labour as a flat rate per repair type, after diagnosis but before any work begins. Parts are quoted separately on your invoice. Typical labour ranges:
Ice Maker Repairs
Standard repair: Most ice maker work — inlet valve, fill tube thaw and correction, module or thermostat replacement, sensor and arm faults — falls in the $220–350 range for labour. Parts are quoted separately.
The cheap outcomes are real. A blocked sensor, raised arm, or filter overdue for replacement can end the visit at the service call. That happens often enough that it’s worth checking the free items on the list above first.
Service-call fee: $119, applied toward the repair if you proceed.
Your firm quote comes from your tech after diagnosis, before any work begins. You approve before we touch anything. Full pricing details.
Related Reading
- Fridge Repair Calgary — Main fridge service page — all brands, all symptoms.
- Find Your Appliance Model Number — Ice maker assemblies are model-specific; the number decides which one fits.
- Is It Worth Repairing? — On an older fridge, an ice maker assembly is a real decision rather than an automatic yes.
Ready When You Are
An ice maker isn’t an emergency, but a weeping inlet valve can become a water-damage problem quietly and slowly. Worth looking at before it does. Kodiak launches in Calgary October 2026 — join the waitlist for day-one priority booking.