Bunn U3 U3A - Manual (Page 11)

Page 11
PROBABLE CAUSE
1. Limit Thermostat
CAUTION - Do not eliminate or
bypass limit thermostat. Use only
Bunn-O-Matic replacement part
#29329.1000
2. Control Thermostat
3. Tank Heater(s)
4. Contactor
1. Circuit Breaker
2. Tank Heater(s)
1. Timer
2. Start Switch
1. Timer
2. Solenoid Valve
3. Lime build-up in swing spout
and pump tubing.
1. Filters
2. Hole in bottom of funnel ob-
structed.
TROUBLESHOOTING (cont.)
PROBLEM
Water not hot
Circuit breaker keeps tripping
Water keeps running from swing
spout
Inconsistent coffee yield
Funnels overflow
REMEDY
Refer to Service - Limit Thermo-
stat for testing procedures. See
page19
Refer to Service - Control Ther-
mostat for testing procedures. See
page 17
Refer to Service - Tank Heater for
testing procedures. See page 30
Refer to Service - Contactor for
testing procedures. See page 15
Refer to Service - Circuit Breaker
for testing procedures. See page
14
Refer to Service - Tank Heater for
testing procedures. See page 30
Refer to Service - Timer for testing
procedures. See page 31 or 33
Refer to Service - Start Switch for
testing procedures. See page 29
Refer to Service - Timer for testing
procedures. See page 31 or 33
Refer to Service - Solenoid Valve
for testing procedures. See page
27
Remove swing spout and insert
deliming rod down into pump tub-
ing as far as possible.
Use Bunn ® filters made for the U3
brewer.
Remove obstruction.
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