Bunn Beverage Dispenser DV User Manual

10

Electronic Controls (cont.)
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 terminals 1 & 4 of the elec-

tronic control assembly with a voltmeter.  Connect 

the dispenser to the power source. The indication 

must be:

 

a.) 100 to 120 volts ac for 100 to 120 volt models 

or

 

b.) 200 to 240 volts ac for 200 to 240 volt models

 or

  c.) 230 volts ac for 230 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:

 

a.) 100 to 120 volts ac for 100 to 120 volt models 

or

 

b.) 200 to 240 volts ac for 200 to 240 volt models 

or

 

c.) 230 volts ac for 230 volt models

 

after a delay of approximately 5 seconds.

12. Disconnect the dispenser from the power source.

Temperature Control Flow Charts (cont.)

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 Test Procedure

1.  Disconnect the dispenser from the power source.

2.  Check the voltage across terminals 3 & 4 of the 

electronic control circuit board with a voltmeter.  

Connect the dispenser to the power source.The 

indication must be:

 

a.) 100 to 120 volts ac for 100 to 120 volt models 

or

 

b.) 200 to 240 volts ac for 200 to 240 volt models

 or

 

c.) 230 volts ac for 230 volt models.

3.  Disconnect the dispenser from the power source.

4.  Check the voltage across the tank heater terminals 

with a voltmeter. Connect the dispenser to the 

power source. The indication must be:

 

a.) 100 to 120 volts ac for 100 to 120 volt models 

or

 

b.) 200 to 240 volts ac for 200 to 240 volt models

 or

 

c.) 230 volts ac for 230 volt models.

5.  Disconnect the dispenser from the power source.

Still Boiling

?

Red Light On While

Boiling

?

Retry

Drain cup

Retry

Disconnect Blue Wire From

Control Board Pin 7

No

Yes

Yes

Yes

No

No

Still Boiling

?

Replace Steam Sensor

Replace Triac Assembly

Check For Split

Tank Heater

Replace Control Board

Finished

Replace Control Assembly

Still Boiling

?

Red Light On While

Boiling

?

Retry

Drain cup

Retry

Disconnect Blue Wire From

Control Board Pin 7

No

Yes

Yes

No

Replace Triac Assembly

Check For Split

Tank Heater

Replace Control Board

Replace Control Assembly

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