Temperature Probe - Bunn Axiom Series Service & Repair Manual

TEMPERATURE PROBE

FIG. 23-1 TEMPERATURE PROBE
Location:
The temperature probe is inserted through the
tank lid assembly.
Test Procedures:
1. Disconnect the brewer from the power source.
2. With a DC voltmeter, check voltage across the
two wires at J9 on control board (Black probe to
black wire, red probe to white wire. Refer to FIG
18-2). Connect the brewer to the power source.
The indication should be approximately between
4vdc cool to 1vdc at ready temperature.
3. Disconnect the brewer from the power source.
If voltage is present as described, circuit is working
correctly, check limit thermostat (and TCO on 230V
models).
If voltage is not present as described, proceed to
#4.
4. Disconnect temperature probe from J9 on control
board. Check the resistance across the two ter-
minals of the temperature probe. The indication
should be approximately between 10.5K cool to
870 at ready temperature.
If resistance is to specifi cation, replace the control
board.
If resistance is not to specifi cation, replace the tem-
perature probe.
Removal and Replacement:
1. Disconnect the brewer from the power source.
2. Disconnect the two pin connector from J9 on
control board.
3. Pull temperature probe out of it's grommet.
4. Install in reverse order.
FIG. 23-2 TESTING TEMPERATURE PROBE
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