Concordia XPRESS - Water System: Water Tank Limit Switch Open

3033-015B Section 15: Troubleshooting
Concordia Xpress Technical Support Manual 15-35
2900-300B
Water System: Water Tank Limit Switch Open
Water Limit
Switch Open
Open top panel door
and check water
pressure gauge.
Using the black
scale, identify the
pressure shown by
the red needle.
Pressure
more than
175psi?
No
Yes
Open the left side
door, Remove the
grounds bin and
observe the tubing
rack on right side.
Notice the last
tube in the rack.
Is water
coming from
tube?
Yes
No
Possible faulty
gauge. Power unit
down shut off water
to unit. Drain some
water from tank, and
replace gauge.
Water tank overheated.
Possible water
temperature probe
problem or relay.
With unit powered down, remove the rear
panel. Verify tank body has cooled to
below 199F. Open the water drain valve
to cool tank faster. With an ohmmeter,
measure across the limit switch.
Water
temperature
reading
changes?
No
Check the water tank
temp probe harness
and connector housings
at both ends of harness.
Look for broken wires or
connection to
backplane not secured.
Power unit down
and restart unit.
Wait for unit to
warm up.
Replace limit switch.
PN 1311-005
Leave the rear panel off. Turn the unit
back on and press the service switch into
the SERVICE position, if necessary.
Navigate to CHK TEMPERATURES >
BREW WATER and observe the water
temperature.
Open
switch?
No
Possible AC drawer error. For
single-phase machines, replace.
PN 2630-049
For international machines, contact
Concordia Beverage Systems for
assistance.
1-800-778-0990
Yes
Wiring
OK?
Shut down unit.
Drain tank and
replace probe.
PN 2660-038
Restart unit.
Yes
Repair or replace
harness problem.
No
Yes
As the tank temperature
rises, observe that the
temperature stops at the
setting in the CHK
TEMPERATURES >
BREW WATER menu.
Temperature
correct?
24Vdc
on?
No
Yes
Verify 24Vdc to relay
is not on when
temperature of the
tank is over the CHK
TEMPERATURES >
BREW WATER value.
Possible shorted
relay. Replace on
rear grinder plate.
PN 1312-031
Replace CPU or
AC drawer.
Yes
No
END PROCESS
Unit
functioning
correctly?
Call Concordia
Beverage Systems
for assistance.
1-800-778-0990
No
Yes
END PROCESS
Problem
repeat?
END PROCESS
Power unit down
and await
technician.
Yes
No
Run several milk
drinks and verify
the water
temperature is
maintained.
Temperature
OK?
No