Dexter Laundry T-900 Operator's Manual page 35

Door will not Thermoactuator
open
Door Rod
Door locking
mechanism
CPU Board,
Ribbon Cable or
Input/Output
Board
Machine Water valves
starts but will
not advance
in the cycle
Drain valve
Fill hose or Water
valve screens
Water
Pressure Switch
Hose
Pressure switch
CPU Board,
Ribbon Cable, or
input/output
board
8514-244-001 REV PR page 35
Check to see if thermoactuator(s) and/or its mechanism are stuck or
binding and not allowing the door lock motor to open. Check to be sure
that red light on Input/Output PCB for locking thermoactuator is not
illuminated and that Input/Output PCB is not sending 120VAC power to
the locking thermoactuator during the last 70 seconds of the cycle. Check
to be sure that red light on Input/Output PCB for unlocking
thermoactuator #1 is illuminated and that Input/Output PCB is sending
120VAC to the unlocking thermoactuator during the last 30 seconds of the
cycle.
Check to see that door rod from mechanism to lock assembly is long
enough to allow lock assembly to disengage. If not, adjust rod.
Check that door lock mechanism is not stuck closed. Check to be sure that
Input/Output PCB is not sending 120VAC power to door locking motor. Be
sure that red light on Input/Output PCB for DOOR SOL #3 is not
illuminated. If door lock motor is receiving 120VAC, check CPU, Ribbon
Cable and Input/Output PCB above.
Check red DOOR SOL #3 light on input/output board. If illuminated,
remove power to washer for 2 minutes to reset CPU board. Reapply
power to washer and check red DOOR SOL #3 light. If no light, okay. If
red light is still on, check the CPU board as described above under "Door
does not lock". If CPU tests okay, change Ribbon Cables between CPU and
input/output board. If red door DOOR SOL #3 light on input/output board
is illuminated, check that 120VAC is going from the input/output board to
the door locking solenoid. If no voltage, replace I/O PCB.
Check to ensure that water valves are operating. If not, check to be sure
that red light on Input/Output PCB for water valves is illuminated (#5, #6,
#7, #8) and that input/output board is sending 120VAC to the water
valve. If 120VAC, change water valve. If no voltage, check Input/Output
PCB.
Check to ensure that drain valve is closing. If not, check for 120VAC to
drain valve from Input/Output PCB red light #4. If 120VAC, change or
clean drain valve. If no voltage, check CPU board, ribbon cable and I/O
PCB.
Check all screens for obstructions and clean.
Check to ensure that water is turned on and operating
Check hose for holes. Be sure the inlet end of the large part of the hose is
lower than the rest of the hose and is free of debris.
Pressure switch must be in the low or high position to close the circuit to
the input/output board. Either the green low level or high level light on
the input/output board must be lighted. Check pressure switch continuity
between terminals #31 & #22 for low level and #31 and #32 for high
level.
Check if Input/Output PCB for red output LEDs will not light for water
valve and drain valve (#4,5,6,7,8). If no output lights illuminated, check
single red light on CPU board. Single red light should be illuminated. If
light is flashing or not on, remove power from washer for 2 minutes to
reset board. Reapply power to washer and check red CPU light. If on
solid, CPU okay. If still flashing or not on, replace CPU board. If CPU tests
okay, change Ribbon Cables between CPU and input/output board. Check
GREEN input LED #14 tub empty has lit in a drain mode of formula. Make
sure Green input LEDs #13 or #14 are lit if Fill portion of formula is being
called for. If red drain valve or water valve output light on Input/Output
PCB is lit, check to ensure that 120VAC is going from the Input/Output
PCB to the drain valve or water valve. If no voltage, replace I/O PCB.
.