How do I clear the Time To Clean light on a Scotsman CU50 ice machine?

Short answer: Descale reminder. If your Scotsman CU50 undercounter cuber is showing Time To Clean light, the controller has logged a specific, documented condition. This page covers what it means, what causes it, what you can safely fix yourself, and when — and why — it takes a technician.

What exactly is the machine telling you?

The Time To Clean indicator on the control panel signals that the machine is due for descaling. The service manual's cleaning procedure uses Scotsman Ice Machine Scale Remover in the reservoir, and the light blinks during the cleaning mode.

Which machines show this?

the Scotsman CU50, a compact undercounter gourmet-cube machine common in bars, coffee shops, offices and break rooms. There's no code display on this one — it reports through a small set of indicator lights on the control panel, chiefly Check Water and Time To Clean, alongside the On/Off and Clean-Reset buttons. Because it lives under a counter, the usual suspects are the ones you can't see: a kinked line or a partly closed valve behind the cabinet, and scale from an overdue cleaning. The machine is patient by design — a failed water fill retries every 20 minutes on its own — so give it time after you fix the supply rather than power-cycling it repeatedly.

What causes it?

• The machine is due for de-scaling — this is a maintenance reminder, not a fault
• The light also blinks during the cleaning mode itself, which is normal

Can you fix it yourself?

Yes, entirely. Run the clean mode (hold On/Off 3 seconds to shut off, then hold Clean-Reset and On/Off together 5 seconds), use 8 oz of Scotsman Scale Remover, flush, then scrub and sanitize the bin. Holding Clean-Reset 3 seconds resets just the light.

Step by step — what to try, in order:

1. Remove the ice, then start the clean mode: hold On/Off 3 seconds to shut off, then hold Clean-Reset and On/Off together for 5 seconds (Time To Clean light blinks)
2. Add 8 oz of Scotsman Ice Machine Scale Remover to the reservoir and run about 30 minutes, then press On/Off to flush and run another 30 minutes
3. Scrub and rinse the bin liner, then sanitize the bin
4. To reset just the light: press and hold the Clean-Reset button for 3 seconds

When do you need a technician — and why?

The cleaning itself needs no technician. But if scale comes back quickly after a proper clean, the water supply needs filtration or treatment — worth a service company's assessment of the water, because no amount of cleaning outruns bad water.

If it does come to a service call and you're in Nashville, TN or Birmingham, AL, we maintain independently compiled lists of local companies that service commercial ice machines — real businesses with verified contact information, none of whom paid to be listed.

Related questions

What does Time To Clean light mean on a Scotsman CU50 undercounter cuber?

Descale reminder. The Time To Clean indicator on the control panel signals that the machine is due for descaling. The service manual's cleaning procedure uses Scotsman Ice Machine Scale Remover in the reservoir, and the light blinks during the cleaning mode.

Can I fix Time To Clean light on a Scotsman CU50 undercounter cuber myself?

Yes, entirely. Run the clean mode (hold On/Off 3 seconds to shut off, then hold Clean-Reset and On/Off together 5 seconds), use 8 oz of Scotsman Scale Remover, flush, then scrub and sanitize the bin. Holding Clean-Reset 3 seconds resets just the light.

When does Time To Clean light on a Scotsman CU50 undercounter cuber need a technician?

The cleaning itself needs no technician. But if scale comes back quickly after a proper clean, the water supply needs filtration or treatment — worth a service company's assessment of the water, because no amount of cleaning outruns bad water. Call a service company if scale returns quickly after cleaning — the water supply likely needs filtration or treatment.

Source: cu50_service_man.pdf (scotsman-ice.com)