The short answer
This code is paired with long cycles or a machine stuck in a particular part of the cycle. One cause is worth naming before any part is suspected: how far the dishwasher is from the water heater. A long, cold pipe run means the machine fills with cool water on every cycle and then spends a great deal of time heating it.
Whirlpool dishwasher code as the manufacturer publishes it
Reference| Code | Meaning |
|---|---|
| 4-2 | Long Cycles and/or Stuck in Cortain Part ale |
What you observe alongside the code
- A cycle that runs hours longer than it used to — The defining symptom.
- The machine stuck at the same point every time — A repeatable stall is easier to diagnose than a random one.
- Dishes cool and wet at the end — Points at the heat step rather than the water.
- Water arriving slowly or in bursts — Points at the fill side instead.
What triggers it, most likely first
- Water arriving too cold, so the heat step runs long — First: the machine waits for a target temperature, and a cold supply or a distant water heater stretches that wait enormously.
- A restricted fill, from a part-closed valve or a clogged inlet screen — Third: the cycle cannot advance until the level is reached, and a slow fill delays every step after it.
- A failing heater or heater relay — Second: the control waits for heat that never arrives and extends the step rather than giving up.
- A slow drain from a loaded filter or kinked hose — Fourth: each drain step takes longer, and the effect compounds across the cycle.
Check in this order, and why
- Time how long the kitchen hot tap takes to run hot — That is the water the dishwasher would otherwise start with.
- Run the kitchen hot tap until it is hot before starting a cycle — Free, and it removes the commonest cause in one move.
- Note whether the machine stalls at the same point each time — A repeatable stall names the step that is waiting.
- Feel whether the door and tub get hot during the cycle — No heat at all points at the heater or its relay.
Clearing the code, then the owner-safe checks
- Run the hot tap at the sink until hot, then start the cycle — The machine then starts with hot water instead of heating a tubful from cold.
About 10 min
- Clean the filter and sump — A slow drain lengthens every drain step in the cycle.
Tools: glovesAbout 15 min
- Clean the inlet screen at the fill valve with the supply closed — A restricted fill delays every step that follows it.
Tools: pliers, towelAbout 20 min
- STOP HERE if the tub never gets warm — That is the heater or its relay, under the tub.
Before you open anything
Safety
Unplug the dishwasher or switch off its breaker before removing the toe panel or the inner door panel. A capacitor can hold a charge after the power is off, and the supply is not switched at the door. Bail any standing water out of the tub before working underneath, and go into the sump with gloves and a light — broken glass collects there.
When this code is a service call
Call when the tub never warms during a cycle, because that is the heater, its relay or the temperature sensor and all three sit under the tub. Call too if the machine stalls in the same place with a clean filter, hot incoming water and a clear fill screen: at that point the remaining suspects need a meter.
Neighbouring Whirlpool dishwasher codes
Which model lines this reading applies to
This reading of 4-2 applies to Whirlpool-built built-in dishwashers of the generation whose service documentation publishes this code, which is where the manufacturer documents it. A machine with a mechanical timer and no diagnostic display does not produce it, and the same characters can be published against a different fault on a KitchenAid or Maytag-badged unit from the same platform.
Lead Appliance Repair Technician · 12 years experience
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
