Bunn DUAL GPR-DBC Repair Manual download pdf (Page 10)

Page 10

TROUBLESHOOTING (cont.)

Possible Cause

Troubleshooting Procedures

Check the sensitivity setting. Refer to

Reﬁll function. If the left three digit

number is less than the right number,

the machine “thinks” it is full and the

reﬁll valve should be off. If the left

number is larger than the right, then

the reﬁll valve will automatically be

turned on to ﬁll the tank. The right

number is the threshold setting and

can be adjusted to compensate for

extreme water conditions: very pure,

low conductance water requires a

higher setting, while high mineral

content, high conductance water

requires a lower setting. Note that

the left number changes from a high

value when water is NOT touching

the reﬁll probe to a low value when

water IS touching the probe. For best

operation, the right number should

be set to a value midway between

these low and high numbers. Before

changing the setting, conﬁrm that the

reﬁll probe is free of scale buildup

and the connection to it is secure.

Substitute a control board known to

be in good working order.

Remove power from the brewer.

Press reset button on limit ther-

mostat. Then check for continuity

through it.

Remove power from the brewer.

Check for continuity through the

tank heaters.

1. Reﬁll Probe or Sensitivity Set-

ting

2. Electronic Control Board

1. Limit Thermostat

CAUTION - Do not eliminate or

bypass limit thermostat. Use only

replacement part #23717.0003.

2. Tank Heaters

Water ﬂows into tank continuously

with power applied to brewer.

Water will not heat or display shows

HEATING TIME TOO LONG

Power

41746 112008

1 2 ... 5 6 7 8 9 10 11 12 13 14 15 ... 47 48

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