Scotsman CME AutoIQ Ice Machine: Refrigeration and Water Lights
On Scotsman CME256, CME506, CME656 and CME806 AutoIQ cubers, the Refrigeration light steady or blinking one, two or three times points to refrigeration, harvest, no cubes sensed or high discharge, and a Water light blinking twice points to the inlet valve. Count the blinks, note the Water light, push and release Off, then Freeze, to reset, and call us with the pattern.
Medium: the lights flag a problem area that can reduce or stop ice making, depending on the pattern.
- Code
- Refrigeration diagnostic light blinks 1 / 2 / 3 times (or steady); Water light blinks 2 times
- Maker
- Scotsman
- Equipment
- Ice machines
- Applies to
- CME256/506/656/806 AutoIQ
What does Scotsman Refrigeration diagnostic light blinks 1 mean?
These cubers use two diagnostic lights to say what the controller found. A steady Refrigeration light means a probable refrigeration problem, such as low discharge or a long freeze. Blinks of one, two or three on the Refrigeration light point to harvest, no cubes sensed or high discharge. A Water light blinking twice means the inlet valve. Both lights together mean the temperature sensors are out of range. So the pattern, not just the presence of a light, is the answer, and the blink count is what we need when you call. The manual's causes follow the same grouping: the Refrigeration light pattern and count, water inlet valve operation, the temperature sensors, the harvest and bin controls, and the refrigerant charge and condenser. Pressing Off and then Freeze resets the machine and shows whether the pattern comes back. Because the lights point to the area and not the part, a technician confirms with gauges and a meter.
Affected models and control systems
This applies to Scotsman CME256, CME506, CME656 and CME806 AutoIQ cubers with the two diagnostic lights. Other Scotsman lines use code displays or different panels.
Code numbers and their meaning can change between control generations. We match the full model and control before acting on a code.
What you may notice
- Refrigeration light steady or blinking a set number of times
- Water light blinking twice
- Both lights on together
- Reduced or no ice production
Possible causes
Listed in Scotsman's documentation
- Refrigeration light pattern and count point to a refrigeration, harvest or discharge problem
- Water inlet valve is not operating
- Temperature sensors read out of range
- Harvest and bin controls are off
- Refrigerant charge or condenser is the cause
Other likely causes — what usually sits behind Refrigeration diagnostic light blinks 1 on this control. A technician confirms which one it is before any part is replaced.
- A dirty condenser raising discharge pressure on a hot afternoon
- An inlet valve screen clogged with sediment after a plumbing repair
Safe checks before calling for service
- Count the blinks on the Refrigeration light and note whether it is steady.
- Note whether the Water light is blinking.
- Push and release Off, then Freeze, to reset the machine.
- If the lights return, call us with the pattern you saw.
How a technician diagnoses Refrigeration diagnostic light blinks 1
- Record the exact light pattern and blink count.
- If the Water light blinks twice, test the inlet valve and screen.
- For a refrigeration pattern, check the condenser, fan and ambient conditions.
- Connect gauges and check pressures, charge and harvest operation.
- Test the temperature sensors if both lights show, and replace only what the readings identify.
- Refrigeration patterns need gauge readings on a regulated refrigerant circuit.
- Inlet valve and sensor tests mean live measurements inside the control area.
How Refrigeration diagnostic light blinks 1 differs from similar codes
These cubers use blinking lights, while the Prodigy ELITE and Prodigy Plus lines use numbered codes on a display.
Technical reference
- Document
- CME256/506/656/806 AutoIQ manual July 2002, "Controller Diagnostic Light Analysis" p.23
- Edition
- June 2007 (printed under the Parts lists note; page footers carry other dates such as July 2004); our title says July 2002, which the PDF does not print
- Models / control
- CME256/506/656/806 AutoIQ
- Section
- Service Diagnosis: Controller Diagnostic Light Analysis, PDF p. 23 (a second Diagnostic Lights page at p. 14 and p. 36)
- Checked
- October 2026
We use the maker's document to read the code and do not reproduce it. Always confirm the complete model and control before applying these steps.
Related Scotsman ice machine error codes
Does a steady Refrigeration light mean the same as a blink?
No. Steady points to a probable refrigeration problem such as low discharge or a long freeze, and blinks point to harvest, no cubes sensed or high discharge.
What does the Water light blinking twice mean?
The inlet valve needs checking.
What if both lights are on?
The temperature sensors are out of range.
Need help with Scotsman Refrigeration diagnostic light blinks 1?
A technician confirms the cause on site and gives you the price in writing before any work starts.