Bunn U3 U3A - Manual (Page 12)

Page 12
TROUBLESHOOTING (cont.)
PROBLEM
Funnels overflow (cont.)
Coffee reservoir overflows
Brewer is making unusal noises
PROBABLE CAUSE REMEDY
3. Pump - Flow Rate
4. Soft Water
1. Coffee reservoir not completely
empty befor a brew cycle was
started.
2. Timer
3. Pump - Flow Rate
1. Solenoid Valve
2. Plumbing lines
3. Water supply
4. Tank Heater(s)
Check pump flow rate with a watch.
Pump flow rate should be approxi-
mately 24 ounces in 15 seconds.
Be sure pump assembly is free of
any obstructions.
When using a water softener, a
coarse grind of coffee may be pre-
ferred. If required, a bypass sys-
tem is available as an optional
feature.
Be sure coffee reservoir is empty
before brew cycle is started.
Refer to Service -Timer for test-
ing procedures. See page 31 or 33
Check pump flow rate with a watch.
Pump flow rate should be approxi-
mately 24 ounces in 15 seconds.
Be sure pump assembly is free of
any obstructions.
The nut on the solenoid must be
tight or it will vibrate during opera-
tion.
Plumbing lines should not be rest-
ing on the counter top.
(A) The brewer must be connected
to a cold water line.
(B) Water pressure to the brewer
must not exceed 90 psi (620 kPa).
Install a regulator if necessary to
lower the pressure to approxi-
mately 50 psi (345 kPa).
Remove and clean lime off the
tank heater. See page 30
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