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The slide-out water tank of a steam oven pulled halfway from its slot beside the control panel, water visible through its clear side.

Viking combi steam oven
showing DESCALE NOW

On Viking's built-in electric combi steam/convection oven, DESCALE NOW means the boiler has built up scale.

(844) 407-1890

Mon–Sat, 8am–8pm

  • Steam and water
  • Steam system repair
  • Source: Viking

Book a visit

Three short steps, about a minute.

or call (844) 407-1890

What DESCALE NOW
actually means.

On Viking's built-in electric combi steam/convection oven, DESCALE NOW means the boiler has built up scale. The manual adds that a partly blocked water filter can play a part.

Viking oven display

What to do when DESCALE NOW shows on the oven

Kind of codeSteam and water

The steam oven found its water tank empty, its supply short, or its steam generator slowed by scale. Refilling and seating the tank and running the descaling program come first; a pump, a level sensor or the generator is looked at only after that.

Usually leads toSteam system repair

A steam or combi-steam oven that makes no steam, weak steam or asks for water it already has, traced to scale, the pump, the generator or the tank sensor.

Shows up asOven Error Code

The oven shows letters and numbers, beeps, and stops a cycle or refuses to start one.

MakeViking

A Mississippi brand of professional-style cooking appliances, with heavy-duty built-in wall ovens.

SourceViking use and care manual F20427: built-in electric combi steam/convection oven (Wayback copy)

Viking built-in electric combi steam/convection oven covered by use and care manual F20427 (a retired model); current Viking RVL steam ovens are described by Viking as not needing descalers.

Before you book,
in this order.

Each step comes from Viking's own guidance for DESCALE NOW on its ovens. Follow it to the end: the last card says whether this is a visit.

01

If the oven has not been descaled recently, replace the water filter first.

02

Run the descaling program: it takes about 30 minutes, followed by two rinse phases that ask you to empty and refill the water tank.

03

Do not interrupt the program; the manual says it cannot be stopped once started.

04

If DESCALE NOW stays after a full program and a new filter, book a visit.

Still there?

It usually turns into steam system repair. Book with the code and the model number.

What not to do

DESCALE NOW is not a service code. It is maintenance the owner can run.

What you may
notice with it.

The oven problem DESCALE NOW tends to arrive with. Answer these at the oven before anyone is booked.

All problems

Before you call

Oven Error Code

All 6 causes, cheapest first
The glowing control display of a built-in wall oven in a US home kitchen showing a blurred, unreadable code, a phone held up beside it as if to look it up. Problem

Oven Error Code

6 causes, cheapest first

Where DESCALE NOW usually leads

Steam system repair.

Steam generator, pump or tank sensor · moderate.
Book a visit What the job involves

Viking
ovens.

A Mississippi brand of professional-style cooking appliances, with heavy-duty built-in wall ovens.

Viking oven repair

More Viking codes

Hot water pumped out

Steam and water on other makes

Bertazzoni rESDacor C-70Gaggenau E182JennAir F7 E0KitchenAid F7 E0Miele F10Samsung C-70Wolf E67
All 20 codes of this kind
A stainless single wall oven is set into a painted cabinet at chest height in a bright US home kitchen. Viking builds this

Single wall oven

One oven cavity set into a cabinet at chest height, with its own controls above the door and nothing to cook on above it.

 A stainless double wall oven fills a tall painted cabinet in a US home kitchen, with both doors closed and both oven lights on. Viking builds this

Double wall oven

Two full oven cavities stacked in one tall cabinet, sharing one control panel and one power supply but heating on their own.

In Viking's own words

The boiler is scaled:
Viking use and care manual F20427: built-in electric combi steam/convection oven (Wayback copy) Viking use and care manual F20427: built-in electric combi steam/convection oven (Wayback copy) Viking use and care manual F20427: built-in electric combi steam/convection oven (Wayback copy)

Every code on this site is taken from the manufacturer's documentation, never from a forum or a parts listing. Viking built-in electric combi steam/convection oven covered by use and care manual F20427 (a retired model); current Viking RVL steam ovens are described by Viking as not needing descalers.

Viking DESCALE NOW oven repair,
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

Tampa BayFL · 31 areas

OrlandoFL · 30 areas

Miami / South FloridaFL · 47 areas

New York MetroNY · 75 areas

HoustonTX · 36 areas

ChicagoIL · 50 areas

Los AngelesCA · 95 areas

San DiegoCA · 31 areas

San Francisco Bay AreaCA · 74 areas

A parent and a child sliding a tray of cookies into an open wall oven together in a bright kitchen
For the heart of your home.

Questions
about DESCALE NOW.

Can I clear DESCALE NOW myself?
If the oven has not been descaled recently, replace the water filter first. If it comes back, it needs a visit.
Why does my Viking combi steam oven want a new water filter along with DESCALE NOW?
The manual links DESCALE NOW to a scaled boiler and also to a partly blocked filter, which lets less water through. Changing the filter first gives the descale a fair test.
Can I stop the descale on my Viking once it has started?
No. Viking's manual says the descaling process cannot be interrupted for safety reasons, so start it when you can let it run to the end.

Back to your everyday

Still showing DESCALE NOW?

Book with the code exactly as shown, the full model number, and whether you can smell gas or burning — with a code, that is where the diagnosis starts.

Schedule a repair Call (844) 407-1890
(844) 407-1890 Schedule a repair