GE UNC15NJBII ice maker Parts

For the GE freestanding ice maker model UNC15NJBII, the reset is done by cycling power with the POWER ON/OFF button. Press and release POWER ON/OFF to turn the unit off, wait about 10 seconds, then press and release it again to restart ice making (the ICE MAKING light should glow white). See the UNC15NJBII owner's manual for the control panel and troubleshooting steps.

Quick reset steps (UNC15NJBII)

• Make sure the water supply valve to the ice maker is fully open.
• Press and release POWER ON/OFF to turn the unit OFF.
• Wait about 10 seconds.
• Press and release POWER ON/OFF to turn the unit ON.
• Confirm the ICE MAKING light is white.
• If the CHECK WATER light is red, restore water supply and restart.

If it still will not run after a reset

These checks solve most “won’t start” or “no ice” complaints on freestanding nugget ice makers:

• Power: Verify the outlet has power and the breaker is on.
• Water supply: If CHECK WATER is lit red, the unit is not getting enough water.
• Time to clean: If TIME TO CLEAN is on, run the cleaning process (the light stays on until cleaning is completed).
• Drain issues: Standing water or a restricted drain can reduce capacity.
• Airflow: Keep the front grille area clear so the unit can move air properly.

Indicator light	What it usually means	What to do next
ICE MAKING (white)	Unit is on and making ice	Allow time for production
CHECK WATER (red)	Water supply is low/off	Open supply, check line for kinks
TIME TO CLEAN (yellow)	Cleaning is due	Run the cleaning procedure

Why it matters

A “reset” on the UNC15NJBII mainly clears a temporary control or motor overload condition by restarting the ice-making cycle. If water supply is low or the unit needs cleaning, resetting alone will not restore normal ice production.

For more symptom-based troubleshooting, use our freestanding ice maker troubleshooting guide.

Last updated: February 2026

If your GE UNC15NJBII freestanding ice maker is not making ice, the most common causes are no water supply, poor water quality, a dirty ice-making system, or the unit operating outside its recommended temperature range. Restoring proper water flow and cleaning usually gets ice production going again.

Quick checks that fix most “no ice” problems

• Confirm the unit has power and is turned on.
• Verify the water supply is potable and the shutoff valve is fully open.
• Check the inlet water line for kinks, pinches, or a clogged screen.
• Make sure the room temperature is in a normal operating range; it performs best around 60°F to 80°F.
• Clean the ice-making section and condenser; lack of regular cleaning leads to mineral buildup and poor performance.

Water supply and water quality (very important on this model)

This ice maker must be connected to a potable water supply. Mineral content in the water can build up on ice-making components over time, which can slow or stop ice production.

What to check	What “good” looks like	What to do if it is not good
Water supply	Steady flow to the unit	Open shutoff valve; straighten/kink-free line
Water quality	Potable water; minimal mineral scale	Use a water filter on the inlet line; descale/clean more often
Reverse osmosis (RO)	Conductivity stays at or above the minimum spec	Add post-treatment or blending so conductivity meets spec

For model-specific requirements and the recommended filter approach, follow the UNC15NJBII owner’s manual.

Why it matters

This GE nugget ice machine uses a continuous ice-making system that starts when the ice level is low and stops when the bin is full. If water flow is restricted or mineral scale builds up, the ice-making system cannot run correctly, so production drops or stops.

Next best step if it still will not make ice

Use our step-by-step troubleshooting for the symptom and test sequence in freestanding ice maker troubleshooting.

Last updated: February 2026

The most common issue that stops ice production is a water supply and water quality problem: the ice maker is not getting steady potable water, or mineral content is causing scale buildup that interferes with the freeze and harvest cycle. For the GE UNC15NJBII freestanding ice maker, GE specifically calls out mineral buildup and the need for potable water.

Most common causes (and what to check)

• Water supply valve not fully open, or supply line kinked behind the unit.
• Non-potable water source or poor water quality.
• High mineral content causing scale on ice-making components.
• Reverse osmosis water without proper post-treatment or blending (conductivity too low).
• Airflow blocked at the front bottom grille, reducing cooling performance.

Quick troubleshooting steps for UNC15NJBII

1. Confirm the unit is powered on and allowed time to start a cycle.
2. Verify the water inlet line is connected to a potable water supply and the shutoff valve is fully open.
3. If you have hard water, plan on regular cleaning and scale control.
4. Keep the front grille clear; this model uses air-cooled refrigeration and needs unobstructed airflow.

Symptom-to-cause guide

What you notice	Most likely cause	Best next step
Runs but makes no ice	No water supply or restricted flow	Check shutoff valve, line routing, and inlet connection
Ice production drops over time	Mineral scale buildup	Clean and address water hardness
Works poorly in warm areas	High ambient temp or blocked grille	Improve ventilation, keep grille clear
Odd taste or cloudy ice	Water quality or minerals	Use potable water and improve water treatment

Why it matters

Freestanding ice makers are extremely sensitive to water quality and airflow. On the GE UNC15NJBII, minerals that are harmless to drink still stick to ice-making surfaces; that buildup quickly reduces output and can lead to “runs but no ice” symptoms.

Helpful resources

• Use the UNC15NJBII owner’s manual for potable water requirements, reverse osmosis guidance, and ventilation requirements.
• If the unit powers on but does not produce ice, follow ice maker runs but no ice for step-by-step checks.

Last updated: February 2026