Door Locking And Unlocking - Whirlpool GHW9100L Service Manual

Locking
The Door Locking Routine will only start if the door is securely closed and the Door Switch Contact
is CLOSED.
1. The Door Lock Relay is energized whenever a wash cycle is started. The relay is operated
for 40 milliseconds.
2. During the next three (3) seconds, the contacts on the door lock are checked by the central
control unit
a. If the contacts are CLOSED, this routine is finished.
b. If the contacts are still open after 3 seconds, the Central Control Unit energizes the
Door Lock Relay for 40 ms and then checks the door lock contacts for 3 seconds. This
will occur a maximum of 6 times. If the door is not locked after 6 trials, the Central
Control Unit will enter a failure mode and the digital display will show FdL.
Unlocking
Unlocking will occur only under the following conditions:
1. The drive motor speed equals 0 or the time since the drive motor STOP command has
been sent to the Motor Control Unit is greater than 180 seconds.
2. The time since the inlet valve was CLOSED is greater than five (5) seconds.
3. If the temperature of the water is greater than 122°F (50° C), the water will be drained
before unlocking will occur.
4. If the water level is higher than the wash level in the Delicate, Wool or Handwash cycles,
the water will be drained before unlocking will occur.
The Unlocking Routine is:
1. The Door Unlock Relay is energized for 40 ms.
2. During the next three (3) seconds, the contacts of the Door Lock are checked. If the con-
tacts are OPEN, the Unlocking Routine is finished.
3. If the contacts are still CLOSED after three (3) seconds, the Central Control Unit ener-
gizes the Door Unlock Relay for 40 ms. and then check the door lock contacts for three (3)
seconds. If the door is not unlocked after 6 trials, the Central Control Unit will enter a
failure mode and the digital display will show FdU.
Child Security Routine
The Child Security Routine is initiated at the start of any wash cycle.
1. The Door is Locked.
2. The tub fills with Cold water for three (3) seconds.
3. The door is Unlocked for five (5) seconds.
4. The door is Locked and the wash cycle begins.

DOOR LOCKING AND UNLOCKING

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