TROUBLESHOOTING (cont.)

 

 

 

 

 

 

HEATING CIRCUIT

 

 

 

 

 

 

PROBLEM

 

PROBABLE CAUSE

 

REMEDY

Water does not heat to proper

4a. Temperature Probe (CDBC)

A) Remove the probe from the

temperature (cont.)

 

 

grommet and submerge in a water

IMPORTANT: Make sure no tem-

 

 

bath of approximately 70°F(21°C).

 

 

Connect an ohmmeter to pins 3

perature tests are taken before the

 

 

and

4 of the J3 connector. At

ready light is "ON". Tank tempera-

 

 

60

°

 

°

ture must be stabilized before read-

 

 

 

F(16 C) the reading should be

 

 

15.3k ± 2k OHMS, at 70°F(21°C)

ings are taken.

 

 

 

 

the reading should be 11.8k ± 2k

 

 

 

 

 

 

 

 

OHMS, and at 80°F(27°C) the read-

 

 

 

 

ing should be 9.3k ± 2k OHMS. If

 

 

 

 

the probe is within these param-

 

 

 

 

eters, reconnect the J3 plug to the

 

 

 

 

control board.

 

 

4b. Temperature Probe (CEZ)

B) Remove the probe from the

 

 

 

 

grommet and submerge in a water

 

 

 

 

bath of approximately 70°F(21°C).

 

 

 

 

Connect an ohmmeter to pins 2

 

 

 

 

and 3 of the J5 connector. At

 

 

 

 

60°F(16°C) the reading should be

 

 

 

 

15.3k ± 2k OHMS, at 70°F(21°C)

 

 

 

 

the reading should be 11.8k ± 2k

 

 

 

 

OHMS, and at 80°F(27°C) the read-

 

 

 

 

ing should be 9.3k ± 2k OHMS. If

 

 

 

 

the probe is within these param-

 

 

 

 

eters, reconnect the J5 plug to the

 

 

 

 

control board.

 

 

5. Limit Thermostat (CDBC & CEZ)

Disconnect the brewer from the

 

 

 

 

power source. Check for continu-

 

 

 

 

ity across the limit thermostat ter-

 

 

 

 

minals. Continuity should be

 

 

 

 

present. If not replace the limit

 

 

 

 

thermostat.(See page 28)

 

 

6. Tank Heater (CDBC & CEZ)

Disconnect the brewer from the

 

 

 

 

power source. Check for continu-

ity between the white terminal of the terminal block and the black wire on the relay on the control board. There should be a low OHM reading. If no continuity is present, check for a wiring problem, then replace the tank heater if no wiring problem is found.(See page 29)

Spitting or excessive steaming

1. Lime build up on temperature

 

probe, tank or tank heater

 

Page 15

Inspect probe and tank assembly for excessive lime deposits. Delime as required.

29319 091203

Page 14 Page 16
Page 15
Image 15
Bunn TWIN Ings are taken, Control board, 4b. Temperature Probe CEZ Remove the probe from, of the J5 connector. At
Page 14 Page 16

TWIN specifications

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