Bunn U3 U3A - Manual (Page 9)

Page 9
TROUBLESHOOTING (cont.)
PROBLEM
Brew cycle will not start (cont)
Brew cycle starts with brew lockout
relay engaged.
PROBABLE CAUSE
2. No power or incorrect voltage to
the brewer (cont)
3. Water level below pump housing.
(Water level in the hot water gauge
glass should be approximately half
full).
4. ON/OFF Switch
5. Start Switch
6. Relay
7. Timer
8. Pump
9. Solenoid Valve
10. Strainer
1. Relay
REMEDY
(A4) Check the terminal block for
440 volts ac across the black and
blue terminals, black and red termi-
nals and the red and blue terminals
on four wire three phase 440 volt
models.
(B) Check circuit breakers or fuses.
Be sure water shut-off valve is open
and that the in-line filters or strain-
ers are not blocking water flow. (Do
not confuse water shut-off valve with
the manual fill and drain valve un-
derneath the brewer).
Refer to Service - ON/OFF Switch for
testing. See page 22
Refer to Service - Start Switches for
testing procedures. See page 29
Refer to Service - Relay for testing
procedures. See page 24
Refer to Service - Timer for testing
procedures. See page 31 or 33
Refer to Service - Pump for testing
procedures. See page 23
Refer to Service - Solenoid Valve for
testing procedures. See page 27
(A) Direction of flow arrow must be
pointing towards brewer.
(B) Remove the strainer and check
for obstructions. Clear or replace.
Refer to Service - Relay for testing
procedures. See page 24
10060 080900