GE Monogram ZBD1800K Series, Technical Service Manual

Page: 31 / 46

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1
DRYING HEATING
PROGRAMME START
B12
INLET VALVE
A1
DISPENSER
B11 WASH HEATING
B2
A12 BUS
WASH PUMP
A2
Po
s
2 3 4 5 6
5 10 15 20 25 30 35 40 45 50 55 60
DRAIN PUMP
A7
POST&PAN
6MIN.
HEAVY WASH
6MIN.
NORMAL WASH
6MIN.
LIGHT WASH
24MIN. 14MIN.
RINSE&HOLD
36MIN.
HEAT DRY
6MIN. 6MIN.
RINSE RINSE RINSE RINSE WASH RINSE
DRY
HOT OR COOL
CYCLE
SWITCH
F E
COOL DRY
X
O O
X
RINSE
DRY
RINSE
6MIN.
A3
B9
B3
A9
A4
CHINA CRYSTAL
7
RESET
VIO
BU
R
BK
W
BK
BR
COLOR FUNCTION LOC
Timer Cycle Chart
Troubleshooting the Timer
If the timer is suspected of faulty operation, refer
to the Timer Cycle Chart and Timer Strip Circuit
and proceed as follows:
1. Index the timer to the first increment of the
HEAVY WASH cycle. (This is a drain period
which activates the pump motor.)
2. If the pump motor fails to operate during the
first cycle increment block, check the electric
supply. If there is no electric supply, check the
door latch switch. If there is electric supply,
disconnect electric supply and check the
pump motor component resistance (see
Specifications,
page 4).
3. If the pump motor does operate, let the timer
motor advance the timer through the drain
increment to determine if the timer motor and
drive train are fully operative.
4. Let the timer advance or index it forward to the
portion of the cycle in question.
5. If a component controlled by the timer fails to
function, as the timer advances through the
cycle, check for voltage at the timer terminals.
If the voltage is supplied to the component,
check the component resistance (see
Specifications,
page 4).
With electric supply disconnected, continuity
through timer contacts, other controls, and wires
can be checked with an ohmmeter.
If the timer contacts fail to close in the sequence
shown on the timer cycle chart, are burned (have
resistance measurable with an ohmmeter), or
don't advance automatically, replace timer.
PROGRAM START
POTS & PANS
RINSE & HOLD
Timer Strip Circuit
SWITCH
PRESSURE
OPTIONAL
SWITCH