A new white water filter cartridge and the used one it replaces lying side by side on a folded towel on a kitchen counter, the open door of a home refrigerator beside them, nobody in the frame.

Sub-Zero REPLACE FILTER — water filter due

Sub-Zero's own ice maker guide lights REPLACE FILTER in red once the unit completes 8,000 ice-making cycles, or Sub-Zero elsewhere recommends changing the same filter roughly every six months, whichever comes first.

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Mon–Sat, 8am–8pm

  • Filters
  • Water filter and descaling service
  • Source: Sub-Zero

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or call (844) 879-5178

What REPLACE FILTER lit red
actually means.

Sub-Zero's own ice maker guide lights REPLACE FILTER in red once the unit completes 8,000 ice-making cycles, or Sub-Zero elsewhere recommends changing the same filter roughly every six months, whichever comes first.

Sub-Zero home appliance display

What to do when REPLACE FILTER lit red shows on the home appliance

Before you book,
in this order.

Each step comes from Sub-Zero's own guidance for REPLACE FILTER lit red on its home appliances. Follow it to the end: the last card says whether this is a visit.

01

Replace the water filter with the model-specific part.

02

Touch and hold CLEAN for 6 seconds to reset the indicator once the new filter is fitted.

03

If REPLACE FILTER lights again well before the expected interval, book a visit to check the water supply and flow.

Still there?

It usually turns into water filter and descaling service. Book with the code and the model number.

What not to do

REPLACE FILTER is not a report that the ice maker itself has failed; the light is a cycle-count reminder cleared by swapping the filter, not a diagnosis of the appliance.

What you may
notice with it.

The home appliance problems REPLACE FILTER lit red tends to arrive with. Answer these at the home appliance before anyone is booked.

All problems

Where REPLACE FILTER lit red usually leads

Water filter and descaling service.

Water filters replaced and flushed, inlet screens checked, descaling run on a steam oven, ice maker or dish care machine · low.

In Sub-Zero's own words

When the unit completes 8000 ice making cycles, “REPLACE FILTER” will illuminate red to indicate the water filter needs to be replaced. Touch and hold “CLEAN” for 6 seconds to reset the indicator.
Sub-Zero UC-15I ice maker use and care guide Sub-Zero UC-15I ice maker use and care guide

Every code on this site is taken from the manufacturer's documentation, never from a forum or a parts listing. Confirmed in Sub-Zero's UC-15I ice maker use and care guide; the guide also notes the filter should be changed every six months, after a prolonged shutdown, or after 8,000 cycles, whichever comes first.

Sub-Zero REPLACE FILTER lit red home appliance maintenance,
where we come out.

The same visit in every metro below: the code, the model number, and a diagnosis before any part is ordered.

All service areas
A family sharing breakfast in a bright, well-kept home kitchen.
For the heart of your home.

Questions
about REPLACE FILTER lit red.

Can I clear REPLACE FILTER lit red myself?
Replace the water filter with the model-specific part. If it comes back, it needs a visit.
Does the ice maker need to be shut off to change the filter?
No. Sub-Zero's own guide notes the unit bypasses the filter when it is removed, so the water supply does not need to be turned off during the swap.
Which comes first, six months or 8,000 cycles?
Sub-Zero's guide lists both as triggers for a change, so a household making ice heavily may hit the cycle count before the six-month mark, and vice versa for lighter use.
What happens if the filter is left in past its due point?
Ice and water quality can decline gradually as the filter's capacity is used up, which is part of why Sub-Zero ties the reminder to a specific cycle count rather than leaving it open-ended.

Back to your everyday

Still showing REPLACE FILTER lit red?

A booking goes further when it has the reminder or code as shown, the model number from the rating plate, and a word on when that filter, screen or tub was last cleaned. With those three, the office can pack the right filter or cleaner for your appliance.

(844) 879-5178 Schedule maintenance