Liquid Level Control Test Procedure; Temperature Control Flow Charts; Water Not Hot Enough - Bunn H10X Operating & Service Manual

SERVICE (cont.)
Electronic Controls (cont.)

Liquid Level Control Test Procedure

1. Disconnect the dispenser from the power source.
2. Check the voltage across terminals 3 & 4 of the
electronic control assembly with a voltmeter.
Connect the dispenser to the power source. The
indication must be 200 to 240 volts ac for 200 to
240 volt models.
3. Disconnect the dispenser from the power source. If
voltage was present as described, proceed to #4. If
voltage was not present as described, refer to the
Wiring Diagrams and check the dispenser wiring
harness.
4. Remove the pink wire from terminal 5 of the elec-
tronic control assembly.
5. Check the voltage across terminals 1 & 4 of the elec-
tronic control assembly with a voltmeter. Connect
the dispenser to the power source. The indication
must be 200 to 240 volts ac for 200 to 240 volt
models after a delay of approximately 5 seconds.
6. Disconnect the dispenser from the power source.
If voltage was present as described, the liquid level
control of the system is operating properly, proceed
to #7.
If voltage was not present as described, replace the
electronic control assembly and the temperature sen-
sor in the tank lid.
NOTE - Each electronic control assembly is calibrated
to a temperature sensor. Both components MUST be
replaced as a set.
7. Reconnect the pink wire to terminal 5 of the elec-
tronic control assembly.
8. Loosen the compression fitting, remove the probe
from the tank lid, and inspect it for mineral depos-
its. Replace it if necessary. Keep the exposed ends
of the probe away from any metal surface of the
dispenser.
9. Check the voltage across the terminals 1 & 4 of
the electronic control assembly with a voltmeter.
Connect the dispenser to the power source. The
indication must be 200 to 240 volts ac for 200 to
240 volt models after a delay of approximately 5
seconds.
10. Touch the screw head end of the probe to the dis-
penser housing. The indication must be 0.
11. Move the probe away from the dispenser
housing. The indication must again be 200 to 240
volts ac for 200 to 240 volt models after a delay of
approximately 5 seconds.
12. Disconnect the dispenser from the power source.
If voltage was present as described, reinstall the
probe, the sensing function of the system is operating
properly.
If voltage was not present as described, check the pink
probe wire and the green ground wire for continuity
and/or replace the probe.

Temperature control Flow Charts

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10889 091599