Bunn TU3Q-EZ, Operating & Service Manual

Page: 9 / 22

Page 9
TROUBLESHOOTING (cont.)
PROBLEM
PROBABLE CAUSE REMEDY
BREWING CIRCUIT
Ready light flashing
Brew cycle will not start
1. Brewer has shut down due to
malfunction.
1. No water
2. No power or incorrect voltage to
the brewer
3. ON/OFF switch not in the "ON" po-
sition
4. Start Switch
5. Low water temperature (Brew
lockout is enabled)
6. Brew solenoid valve
7. Control Board
Refer to
Diagnostic Chart for in-
formation. See page 13
Water lines and valves to the brewer
must be open.
Check for voltage across the black
and white terminals at the terminal
block.
The indicator lamp must be lit.
Refer to
Service - Start Switch for
testing procedures. See page 18
Allow brewer to heat until ready
lamp is lit, or disable the brew lock-
out feature. See page 7
Refer to
Service - Brew Solenoid
Valve for testing procedures. See
page 15
Attach a voltmeter to terminals J1-
1 & J1-7 of the control board. Con-
nect the brewer to the power
source. Voltage should be present.
Disconnect the brewer from the
power source. Attach a voltmeter
to terminals J1-1 and J1-8. Recon-
nect the brewer to the power
source. With the ON/OFF Switch in
the "ON" position, voltage should be
present. It should not be present in
the "OFF" position. If these readings
are not correct, replace the control
board assembly. See page 21
29460 082300