Maytag Dryer Error Code D15

Error code D15 on a Maytag stack dryer indicates a Lower Burner Return Voltage Fault specific to the lower drying pocket. This code is the lower-unit counterpart to error code D23, which monitors the same function in the upper pocket. The fault means the dryer's control board is not detecting the expected voltage signal returning from the lower burner circuit after an ignition attempt or during a heating cycle. This return voltage signal is how the control system confirms the burner is operating correctly. When that confirmation signal is absent or outside the expected range, the board logs D15 and typically disables the lower pocket's heating operation.

The lower burner assembly in a gas stack dryer includes the gas valve, igniter, flame sensor (radiant sensor), and associated wiring harness. Any failure in this circuit can interrupt the return voltage signal. The gas valve coils, which open to allow gas flow, are a common point of failure. The radiant sensor, which detects burner flame and signals the control board, is another critical component in this loop. Wiring connections between these components and the control board are also subject to heat damage, corrosion, or vibration-related loosening in a stacked configuration.

Because stack dryers are taller units with two independent drying systems sharing a single frame, servicing the lower pocket can require more disassembly than a standard standalone dryer. Technicians should inspect the lower burner wiring harness for damaged insulation or loose connector pins before condemning individual components. Gas supply pressure to the lower unit should also be confirmed as adequate, since a pressure drop can prevent ignition and trigger a return voltage fault even when the electrical components are functioning correctly.