Ice from ice machine tastes bad, smells musty or makes drinks taste “off”? In most cases the cause is one of five things: stale ice that has absorbed odors, slime or scale inside the machine, the water supply, an expired filter, or cleaning chemical residue. The fix is usually a proper clean and sanitize, fresh ice, and the right water filter. Below is how to match the taste or smell to the cause, then fix it for good, whether you run a commercial machine or a home undercounter unit.
Ice from ice machine tastes bad? Match the symptom to the cause
| What you notice | Most likely cause | First fix |
|---|---|---|
| Stale, freezer or “fridge” taste | Old ice absorbing odors from the bin or nearby food | Empty the bin, clean it, make fresh ice |
| Musty, earthy or moldy smell | Slime or mold in the water trough, evaporator or bin | Full clean and sanitize per the manual |
| Chlorine or “pool” taste | Municipal water treatment, no or spent carbon filter | Install or replace a carbon filter |
| Rotten egg or sulfur smell | Sulfur in the water supply | Test the water; ask a water treatment pro |
| Metallic taste | Water supply minerals or plumbing | Test the water and check the filter |
| Soapy or chemical taste | Cleaner or sanitizer residue, or chemicals stored nearby | Rinse, discard ice, move chemicals away |
| Plastic taste in a new machine | Start up residue | Clean and sanitize, discard first harvests |
1. Stale ice that has absorbed odors
Ice is porous to smells. Culligan notes that ice that sits too long can go stale and absorb flavors from the freezer or the ice bin, and that machines used only occasionally are prone to it. This is common in offices, bars that close for a few days, and home ice makers that run but rarely get emptied.
The fix: empty the bin completely, wash and sanitize it, and let the machine make a fresh batch. Keep the bin door closed, and never store food, bottles or produce in the ice bin. In a commercial kitchen this is also a food safety rule: the FDA Food Code treats ice as food, and ice used to chill the outside of food or containers may not then be used as food. If your bin is oversized for your usage, ice sits longer, so match the bin to how much you actually serve.
2. Ice maker ice smells musty: slime, mold and scale
Any surface in an ice machine that touches water can grow slime or mold or build up scale. WebstaurantStore recommends cleaning and sanitizing a commercial ice machine at least once every six months: first a cleaning cycle to remove lime and scale, then a separate sanitizing step to kill algae and slime. Busy kitchens, warm rooms and hard water may need it more often, and your manufacturer’s schedule takes priority.
Signs this is your problem: a musty smell when you open the bin, pink or black film on the bin walls or water trough, and ice that tastes off even with fresh water. Follow our step by step guide on how to clean an ice machine, and use only the cleaner and sanitizer your manufacturer approves. Never mix the two chemicals. For Manitowoc Indigo machines, an add on such as the Manitowoc iAuCS automated cleaning system ($538) is available; confirm compatibility with your exact model before ordering.
3. The water supply
Your ice can only taste as good as the water going in. Culligan points out that water quality varies by location, and that a chlorine taste suggests water treatment or filtration issues, a sulfur smell can come from high sulfur content, and a metallic taste can come from the tap water itself. Run a simple test: pour a glass of water from a tap on the same line. If the water tastes the same as the ice, the problem is upstream of the machine.
Carbon filtration targets taste and odor. Our ice machine water filter guide explains sediment, carbon and scale inhibitor stages and how to size a system for your machine’s daily output. Sulfur, iron or very hard water can need treatment beyond a standard ice machine filter, so get a water test and talk to a water treatment professional. A licensed plumber should handle any changes to the supply line.
4. An old or missing filter
Filters have a capacity limit. Once a carbon cartridge is spent, chlorine and odors pass straight through, and a clogged sediment stage can starve the machine of water. Change cartridges on the schedule in the filter’s instructions, or sooner if taste changes. Options we carry include:
- Manitowoc K00530 Arctic Pure Plus cartridge ($65.48): a 5 micron NEO replacement cartridge that the listing describes as filtration for cleaner, better tasting ice and water.
- Icetro IcePro 400 filtration system ($306): sized for ice machines producing up to 400 lbs per day, and designed to address scale and poor water quality, per the listing.
5. Cleaning chemical residue
A soapy, sour or chemical taste right after maintenance usually means residue. WebstaurantStore advises rinsing all areas with clean water after cleaning and throwing out the first batch of ice made after cleaning and sanitizing. Culligan also recommends keeping cleaning supplies away from the ice maker so fumes and spills cannot reach it. If the taste persists after two or three harvests, repeat the rinse and check that no parts were reinstalled with sanitizer pooled inside.
Ice machine odor from the drain
A sewer smell that seems to come from the bin can be a drain issue rather than the ice. Ice machine and bin drains should empty into an open floor drain or receptor through an air gap, not connect directly to a sewer line. If you smell drain gases, have a licensed plumber inspect the drain line, trap and air gap against local code.
When to repair or replace
If a machine keeps growing slime weeks after a proper sanitize, the bin insulation or gaskets may be damaged, or there may be hidden buildup a technician needs to reach. Our guide on how long ice machines last covers when replacement makes more sense. If you are upgrading, compact options include the Manitowoc NEO UYP0190A undercounter half dice machine ($3,332) with a 90 lb bin, and for homes and outdoor bars, the Marvel 15 inch outdoor clear ice machine ($4,519), which lists up to 39 lbs of clear ice per day, 28 lbs of storage and cleaning reminders. Browse more on our Manitowoc brand page and in our commercial kitchen equipment guide.
Frequently asked questions
Why does my ice taste weird but my water is fine?
If the tap water tastes clean, the cause is inside the machine or bin: stale ice, slime or mold, or residue from cleaning. Empty the bin, clean and sanitize, and discard the first batch.
Why does my ice maker ice smell?
A musty smell usually means slime or mold. A fridge or food smell means the ice has absorbed odors. A sewer smell points to the drain. Each has a different fix, listed above.
How often should I clean an ice machine to prevent bad tasting ice?
At least every six months for commercial machines, per WebstaurantStore, or more often if your manufacturer, water quality or environment calls for it.
Can a water filter fix ice machine odor?
A carbon filter helps with chlorine taste and odors that come from the water. It will not remove slime already growing in the machine, so clean first, then filter.
Need a replacement filter, a cleaning system or a new ice machine? Call The Everything Depot at 866-777-2590, Monday to Friday, 9AM to 6PM PST, and we will match parts to your model. Orders of $999 or more ship free by freight; smaller orders ship for a flat $200. Returns follow our return and refund policy.
Sources: WebstaurantStore, How to Clean an Ice Maker; Culligan Quench, Why Does My Ice Taste Bad?; FDA Food Code.
