Concordia XPRESS - Refrigeration System: Temperature Above 40˚F

3033-015B Section 15: Troubleshooting
Concordia Xpress Technical Support Manual 15-23
2900-300B
Refrigeration System: Temperature Above 40˚F
Refrigeration
unit temperature
above 40F
Yes
Refrigeration
unit temperature
below
39F?
Refrigeration
unit door open
within last four hours
or between defrost
cycles?
Verify the reflector is
attached properly (1" above
the floor of the refrigeration
unit shell). Close
refrigeration unit door for
three hours.
Yes
Air filter
screen
and filter
clean?
No
No
Remove air filter
and replace.
PN 1120-362
No
Refrigeration
unit temperature
below
39F?
Yes
No
Internal and
external fans
working?
Yes
Disconnect the fan’s
electrical connections to the
low power harness. Measure
for 24Vdc at harness
connector housings for each
fan assembly.
24Vdc
present?
No
Check for open wires.
Verify harness is plugged
into backplane properly.
No
Yes
Yes
Replace external fan assembly.
PN 2310-043
or
Replace internal fan assembly.
PN 2310-031
or
Replace enclosure fan.
PN 2510-045
Enclosure
fan
working?
Power down
machine. Check
F18 fuse on DC
board.
F18
fuse is
OK?
Yes
Check all
valves, relays
and fans for
shorts.
No
Identified
short?
No
Replace fuse
and the
shorted item.
Yes
Harness
OK?
Check harness
side diodes for
shorts. Check
harness for
pinched wires.
Replace DC
board.
Repair or fix
harness problem.
Yes
No
Yes
No
Door
seal
OK?
Yes
No
Replace seal on
interior refrigeration
unit door assembly.
PN 2510-004
Navigate to
TEST ROUTINES >
REFR CURRENT.
Is current below
10.4 amps?
Yes
Check JP3
harness and
backplane
connections for
burn marks.
Harness/
backplane
OK?
Yes
No
Replace
refrigeration
unit module
cell or cells.
PN 2320-036
Replace harness
or backplane,
JP3 housing.
Ice
on module
fins?
Yes
Module
and shell
gap?
Install insulation
tape to fill gap.
Re-inspect door
seals and check
for gaps. Check alt
milk opening for air
gaps.
Yes
No
No
DC board
resistor R2
damaged?
Replace DC
board.
Yes
10vdc
present on
DC
board?
Replace DC
board.
Yes
No
Refrigeration
unit temperature
reading
correctly?
Insert thermometer
into refrigeration
unit as close as
possible to probe
under internal fan.
Probe equals
thermometer after
15 minutes?
Replace
probe.
PN 2660-031
No
No
Yes
No
Is the
temperature
below
32F?
No
Possible bad
capacitor on the DC
board. Replace the
DC board assembly.
PN 2630-034
Yes
Yes
Is the
ambient
temperature near the
air filter above
81F?
No
Pull unit away from
wall or install small
fan to route warm
air away from the
air intake at rear of
machine.
Yes
Refrigeration
unit temperature
below
39F?
Yes
No
END PROCESS