When an ice maker stops working, start at the water side. A partially closed supply valve, a clogged inlet screen, or low line pressure will starve the machine. If water is reaching the unit, the fault usually lies in the fill valve, the thermistor that senses the bin, or the module that runs the harvest cycle.
What to Check First
A few quick checks are safe to try before booking a technician:
- Confirm the water supply valve is fully open.
- Check that the ice maker is switched on and the bin is seated.
- Replace the water filter if it is overdue.
- Look for a frozen fill tube or a jammed ejector.
Before You Dig In
Turn the ice maker off before clearing a jam so the ejector cannot cycle on your hand.
Likely Causes and Fixes
| Symptom | Likely Cause | What the Fix Involves |
|---|---|---|
No water to unit | Closed valve or clogged inlet screen | Open the supply; clear or replace the inlet valve |
Water but no ice | Thermistor or module fault | Test and replace the thermistor or ice module |
Small or hollow cubes | Low pressure or partial freeze | Check pressure and the harvest cycle |
Notes by Brand
The failure looks a little different across the brands we service. Here is what we check on each:
| Brand | What We Look At |
|---|---|
| Sub-Zero | Clear-ice modules and fill valves; we check water pressure and the thermistor. |
| Scotsman | Nugget and cuber machines; we clean the system and test the water valve. |
| Bosch | French-door ice modules; we inspect the fill tube and auger motor. |
| KitchenAid | Whirlpool-platform modules; F-codes can point to the sensor. |
| Thermador | Column ice makers; we check the inlet valve and harvest cycle. |
| True Residential | Undercounter ice; we verify condenser cleanliness and water flow. |
Have a Sub-Zero or Wolf That Needs Attention?
Book online and a brand-focused technician will diagnose it. Diagnostic and travel fees, if applicable, are confirmed before the appointment and before repair approval.
When to Call a Technician
If water reaches the unit but no ice forms, the fill valve, thermistor, or module likely needs testing and replacement. Book a diagnosis so the right part comes on the diagnostic visit.