Bunn Dual Operating & Service Manual page 24

SERVICE (cont.)
ELECTRONIC CONTROL ASSEMBLY (cont.)
BREW START- LOCK
The water must be heated to the preset tempera-
ture indicated by the glowing ready light before a brew
cycle can be initiated.
If the ready light goes out during a brew cycle, the
cycle will continue until it is completed. You must wait
until the ready light glows before starting another brew
cycle.
PROBLEM:
LIQUID LEVEL CONTROL SYSTEM DOES NOT
YES
OVERFLOW CUP FULL
(4)
NO
DISCONNECT LEVEL PROBE
(7)
VOLTAGE PRESENT AT
YES
SOLENOID VALVE
(14)
NO
REPLACE
CONTROL
ASSEMBLY (1)
REFILL
REMOVE POWER
DRAIN CUP (4)
RETRY
YES
DOES WATER FLOW
REPLACE PROBE
(7)
NO
REPLACE
SOLENOID VALVE
(14)
P808
Page 24
PROBLEM:
LIQUID LEVEL CONTROL OVERFLOWS
DRAIN CUP
(4)
RETRY
OVERFLOW
?
YES
DRAIN CUP (4)
DISCONNECT PROBE
WIRE FROM PROBE (7)
SHORT PROBE WIRE
TO CHASSIS
RETRY
OVERFLOW
?
YES
DRAIN CUP (4)
DISCONNECT WIRE
FROM
SOLENOID VALVE (14)
RETRY
OVERFLOW
?
NO
REPLACE
CONTROL
ASSEMBLY (1)
Liquid Level Control Test Procedure:
1. Disconnect brewer from the power source.
2. With a voltmeter, check the voltage across termi-
nals 3 & 4 of the electronic control assembly (1).
Connect brewer to power source. The indication
must be:
a.) 208 volts ac for three wire 120/208 volt models
and 240 volts ac for three wire 120/240 volt
models.
b.) 200 to 240 volts ac for two wire 200 or 240 volt
models.
NO NO
REPLACE PROBE (7)
YES
REPLACE SOLENOID
VALVE (14)
P809
27040 041100