Jenn-Air Dishwasher Error Code E:19

Error code E:19 on a Jenn-Air dishwasher indicates that the flow sensor is failing to send impulse signals to the control board, even though the heat pump is detecting the presence of water in the system. The flow sensor is a reed switch type device that generates a series of pulses as water moves through the circulation path. The control board expects to receive these pulses during operation as confirmation that water is flowing at the correct rate. When pulses are absent despite the heat pump registering water, the control board interprets this as a flow sensor fault and halts the active wash programme, then initiates a drain cycle to prevent potential damage from running dry or from stagnant water.

The reed switch at the heart of the flow sensor operates magnetically. A small rotor or impeller spins as water passes through, and a magnet on the rotor triggers the reed switch to open and close repeatedly, producing the pulse signal. If the reed switch fails internally, corrodes, or if the impeller becomes jammed by debris, no pulses are generated. The wiring harness connecting the sensor to the control board is equally critical, as a broken wire, corroded connector, or loose terminal will interrupt the signal path and produce the same fault symptom.

Diagnosis should begin with a visual inspection of all wiring and connectors between the flow sensor and the control board, looking for damage, corrosion, or disconnection. If wiring checks out, the reed switch itself should be tested directly. A functioning reed switch will show continuity changes as a magnet passes near it. A switch that reads continuously open or continuously closed regardless of magnetic input has failed and requires replacement. Debris blocking the impeller can sometimes be cleared without part replacement, but a faulty reed switch will need a new sensor unit.