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4.4.2 Overfill Mode - Drain Pump Not Operating
Symptom: Overfill mode indicated by
Heated Dry LED
rapidly flashing, all outputs terminated and the drain pump
NOT operating.
The electronic power control board (PCB) continuously
monitors the complete drain and drain pump circuit from the
DRAIN terminal to the N terminal on the main terminal block.
In effect, the “watch dog circuit” ensures if an open circuit is
present, the
Heated Dry LED will rapidly flash to indicate an
overfill. All outputs from the electronic power control board
(PCB) will be terminated.
The complete circuit with the drain pump field windings
resistance of 35 ohms must provide continuity from the
electronic power control board (PCB) terminal DRAIN to the
neutral N terminal of the main terminal block.
Refer to the following “watch dog wiring circuit” for drain
mode.
The following malfunctions can cause the “Heated Dry”
LED to rapidly flash and terminate all outputs of the
electronic power control board (PCB).
• DRAIN terminal not attached to the electronic power
control board (PCB).
• Wire “B7-D” not attached to the drain pump terminal L.
• Open circuit of drain pump field windings - resistance 35
Circuit Diagram: "Watch Dog" circuit for
drain mode
Important. Check all wiring connections before
reconnecting to supply.
ohms ±10% must be present.
• Neutral wire “XN-D” not attached to the N terminal of the
drain pump.
• Wire “XN-D” not connected to N terminal of the main
terminal block.
• Any faulty Quick Connect terminals in the circuit.
To test the continuity/resistance of the circuit, proceed
as follows:
• Remove wire Quick Connect terminal “XN-D” from N of
the main terminal block.
• Remove wire “B7-D” Quick Connect terminal from the
DRAIN terminal of the electronic power control board
(PCB).
• Measure the resistance between wire terminals “B7-D”
and “XN-D”. Continuity must exist with a resistance of
approximately 35 ohms.
To test the continuity/resistance of the circuit, proceed
as follows:
• Remove wire Quick Connect terminal “XN-D” from N of
the main terminal block.
• Remove wire “B7-D” Quick Connect terminal from DRAIN
terminal of electronic power control board (PCB).
• Measure resistance between wire terminals “B7-D” and
“XN-D”. Continuity must exist with a resistance of ap-
proximately 35 ohms.
