Dacor Range Oven Cooktop Error Code L4

The L4 error code on a Dacor Third Generation Dishwasher signals a water intake fault rooted in pulse count monitoring. The water inlet system uses a flow meter or pulse-generating sensor to track incoming water volume. Under normal operation, the dishwasher expects to register at least 80 pulses within the first 60 seconds of the fill cycle. If that threshold is not met, or if the correct total pulse count is not achieved within 255 seconds, the control board interprets this as insufficient water intake and halts the program entirely.

This fault most commonly stems from restricted or interrupted water flow to the unit. A kinked inlet hose, a partially closed supply valve, low household water pressure, or a clogged inlet screen can all reduce flow to a level where the pulse sensor cannot register adequate counts within the required timeframe. The flow meter itself can also fail mechanically or electrically, producing inaccurate or absent pulse signals even when water flow is adequate.

Because the program stops completely when L4 triggers, the dishwasher will not advance to wash or drain cycles until the underlying condition is corrected. Technicians should verify water supply pressure and flow rate first, inspect the inlet valve for proper operation and solenoid continuity, and then evaluate the flow meter sensor and its wiring harness for damage or connection issues. Resolving this code requires confirming that both the physical water delivery and the pulse counting system are functioning correctly together.