Sub-Zero Code 50 U 80: Water Flow meter not detected

What Code 50 U 80 Means

Ice Maker / Water System Fault

Water Flow meter not detected. Verify power and wiring to flow meter assembly. If power and wiring are OK, replace flow meter assembly.

Ice maker and water system codes cover the water valve, supply line, icemaker module, dispenser, and flow meter — anything involved in getting water into the unit and turning it into ice.

01
The water valve solenoid has stuck open, stuck closed, or failed electrically
02
A kink or freeze-up in the water supply line is restricting flow
03
The icemaker module or dispenser motor has failed
04
The water flow meter isn’t detecting flow correctly

Safe Checks You Can Do First

Before you call.

A few things worth checking yourself — none of it requires opening the sealed system or working inside the control panel.

01
Check that the water supply line behind the unit is fully open at the shutoff valve
02
Check for a visible kink in the line
03
Check whether the ice bin is jammed or overfilled, which can trigger a stuck-switch fault

When to Call a Professional

Beyond the supply-line and ice-bin checks above, tracing a fault to the valve, module, or flow meter means testing components behind panels — worth having a technician confirm before any part is ordered.

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FAQ

Code 50 U 80, answered.

What does Sub-Zero code 50 U 80 mean on my ice / water?

Code 50 U 80 means: Water Flow meter not detected. Verify power and wiring to flow meter assembly. If power and wiring are OK, replace flow meter assembly. It falls under ice maker / water system fault — Ice maker and water system codes cover the water valve, supply line, icemaker module, dispenser, and flow meter — anything involved in getting water into the unit and turning it into ice.

Can an ice maker or water fault fix itself?

Sometimes, if it’s caused by a temporary kink in the supply line or an overfilled ice bin. A fault that keeps returning points to a real component issue.

Is it safe to keep using the water dispenser with this code active?

If water is leaking or pooling, turn off the supply line at the shutoff valve until it’s inspected to avoid water damage.

Can I check the water supply line myself?

Yes — checking that the shutoff valve behind the unit is open and the line isn’t visibly kinked is a safe first step anyone can do.

Does a water fault always mean the valve needs replacing?

Not always — it could be the valve, the icemaker module, the flow meter, or simply a restricted supply line, which the diagnostic visit narrows down.

How long does an ice maker or water valve repair typically take?

Once diagnosed, most are same-visit repairs.

Sub-Zero Code 50 U 80: Water Flow meter not detected

The fix points to the water valve, icemaker module, or flow meter. Beyond the supply-line and ice-bin checks above, tracing a fault to the valve, module, or flow meter means testing components behind panels — worth having a technician confirm before any part is ordered.

Ice Maker / Water System Fault

What you might notice.

Before you call.

Beyond the supply-line and ice-bin checks above, tracing a fault to the valve, module, or flow meter means testing components behind panels — worth having a technician confirm before any part is ordered.

Other Ice Maker / Water System Fault codes.

Code 50 U 80, answered.

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