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A stainless door-type dish machine in a restaurant dish room with its hood raised and its wash chamber empty, a clean wire rack on the landing table beside it, the tiled floor dry, nobody at the dish machine.

Rational Service 42.1: the water supply to the steam generator is not right

The steam and combination modes depend on water from the building line.

(844) 571-4566

Mon–Sat, 8am–8pm

  • Water, fill and drain
  • Dish machine repair
  • Source: Rational

Book a visit

Three short steps, about a minute.

or call (844) 571-4566

What Service 42.1
actually means.

The steam and combination modes depend on water from the building line. Service 42.1 reports that the supply is not working correctly. Rational limits the oven to hot air mode until it is fixed.

Rational commercial appliance display · also shown as 42.1

What to do when Service 42.1 shows on the commercial appliance

Kind of codeWater, fill and drain

Water is not arriving, not reaching its level, not heating or not leaving on time. A dish machine may be short of fill because a supply valve is half closed or its line strainer is clogged, it may drain slowly through a scrap basket full of debris, or its booster may be too scaled to heat the rinse; a combi's steam generator may be scaled or its water treatment exhausted; a washer-extractor may time out on a slow drain. Opening the supply valve, cleaning strainers with the unit off and checking the drain line are fair; a pump, a fill valve, a heater or a leak near wiring is a visit.

Usually leads toDish machine repair

Undercounter, door-type and conveyor dish machines: tank heaters, boosters, wash pumps, fill and drain valves.

Shows up asCommercial Appliance Error Code on a Combi, Fryer, Dish Machine or Laundry Display

A commercial appliance error code appears as letters or numbers on a combi, fryer, reach-in controller, dish machine or laundry machine display, or as a flashing light or an alarm tone.

MakeRational

A Rational visit is timed after the evening cleaning cycle, when the cabinet is cool and the display can be read without a load inside.

SourceRATIONAL iCombi Pro floor units 20-1/1 and 20-2/1, original instructions for use (US English)

Listed in the error message tables of the iCombi Pro floor unit instructions for use (models 20-1/1 and 20-2/1, US English edition).

Before you book,
in this order.

Each step comes from Rational's own guidance for Service 42.1 on its commercial appliances. Follow it to the end: the last card says whether this is a visit.

01

Make sure the shut-off on the oven's water line is open.

02

Carry on with dry heat recipes, since hot air mode still works.

03

Book a visit if the valve is open and 42.1 stays.

Still there?

It usually turns into dish machine repair. Book with the code and the model number.

What not to do

Service 42.1 is not the same as Service 43.1, where the internal water supply does not close and water may keep flowing. It is also different from Service 46.1, which shares the wording but leaves cooking fully available.

What you may
notice with it.

The commercial appliance problems Service 42.1 tends to arrive with. Answer these at the commercial appliance before anyone is booked.

All problems

Before you call

Commercial Appliance Error Code on a Combi, Fryer, Dish Machine or Laundry Display

All 8 causes, cheapest first

It also comes with

Close view of the dark touch control panel on the front of a stainless combi oven in a commercial kitchen, one abstract amber warning indicator glowing among unlit icons, the steam-fogged glass door blurred beside it. Problem

Commercial Appliance Error Code on a Combi, Fryer, Dish Machine or Laundry Display

8 causes, cheapest first

Where Service 42.1 usually leads

Dish machine repair.

Dish machine tank heater or booster element, thermostat, fill valve, float switch, drain valve, wash pump seal or motor, conveyor drive · moderate.
Book a visit What the job involves

Rational
commercial appliances.

A Rational visit is timed after the evening cleaning cycle, when the cabinet is cool and the display can be read without a load inside.

Rational commercial appliance repair

More Rational codes

Service 10Service 11Service 20.1Service 25Service 28.2Service 29Service 31.1Service 32.1Service 40Service 41Service 47.1Service 50
All 15 Rational codes

Water, fill and drain on other makes

Alto-Shaam E01Blodgett Water Level ErrorCleveland LOW WATER lightDexter F2Frymaster E33Hatco LO H2OHobart 019Miele Professional F18
All 43 codes of this kind
A working restaurant cooking line under a stainless ventilation hood, two stainless gas fryers with baskets hanging above the oil, a flat griddle and a combi oven with a glass door beside them, the equipment clearly the subject, a cook seen only from behind and shoulders down at the far end of the line, warm kitchen light, small blue flames visible under the griddle. Rational builds this

Commercial cooking equipment

Fryers, griddles, charbroilers, restaurant ranges, convection and combi ovens, steamers, kettles, holding cabinets and toasters, on gas or electric, that make up the hot side of a kitchen line.

In Rational's own words

The water supply is malfunctioning.
RATIONAL iCombi Pro floor units 20-1/1 and 20-2/1, original instructions for use (US English) RATIONAL iCombi Pro floor units 20-1/1 and 20-2/1, original instructions for use (US English)

Every code on this site is taken from the manufacturer's documentation, never from a forum or a parts listing. Listed in the error message tables of the iCombi Pro floor unit instructions for use (models 20-1/1 and 20-2/1, US English edition).

Rational Service 42.1 commercial appliance 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 restaurant team working a busy commercial kitchen line.
For the heart of your home.

Questions
about Service 42.1.

Can I clear Service 42.1 myself?
Make sure the shut-off on the oven's water line is open. If it comes back, it needs a visit.
What still works on a Rational showing Service 42.1?
Hot air mode. Steam and combination cooking need water, so they are unavailable until the supply is sorted out.
Could a closed valve cause Service 42.1 on a Rational?
Yes, and a shut or half-shut valve is the quickest thing to rule out. If it is open, the problem is inside the oven or in the supply line and needs a technician.
Why are there several 42 numbers on Rational combis?
The manual uses 42.1 to 42.6 in different tables: steam generator, hot air, humidity and care. The exact number tells the technician where to start.

Back to your everyday

Still showing Service 42.1?

A booking with a code goes further when it has the code as shown, the model and serial from the data plate, and a word on whether the unit still holds temperature, heats, rinses or spins. With those three, the office can match the likely part to your unit the same day.

Schedule a repair Call (844) 571-4566
(844) 571-4566 Schedule a repair