BCX14G
BCX14G TROUBLESHOOTING GUIDE
19
In this troubleshooting guide, the schematic is
broken down into areas. This allows the oven to be
checked in sections.
When troubleshooting, tilt the control panel down
for access to use your voltmeter. The main control
circuit voltage for all BX / BCX and CNVX model
ovens is 24DC volts. Once the problem is
determined be sure to power the oven down before
disconnecting connections.
NOTE: Always troubleshoot Combi ovens in the
following sequence: COOL DOWN, HOT AIR,
STEAM and then COMBI. Reference the text that
follows with the appropriate troubleshooting
schematic to help you troubleshoot each mode.
DC VOLTAGE TEST POINTS
1.
At the DCV power supply should be (2)
+24Dcv and (2) -24Dcv_Rtn connections, when
115Acv is applied to the power supply there
will be a small green light on at the power
supply and it should always have 24Dcv
between the plus and minus points.
2.
Locate the logic board small connector
J1
using
your voltmeter checking for 24Dcv between
terminals (J1-1) 24Dcv Rtn to (J1-4) +24Dcv to
verify true 24Dcv input to enable the logic
board during the power up.
3.
The
J1
connector
between (J1-1) -24Dcv Rtn
and (J1-4) +24dcv will be the best (Test points).
When troubleshooting any problems, if your
looking for a low signal test between (J1-4)
+24Dcv RD to the low input searching for, or if
your looking for a +24Dcv_H positive leg of
power check between (J1-1) -24Dcv_Rtn and
the high signal searching for. (See FIGURE 1)
4.
Checking for 24Dcv at the IFB relay board
J7
connector between (J7-1) to (J7-2).
5.
NOTE: While troubleshooting the 24Dcv circuit
with the wire schematic you will see that most
all of the control switching is to a (Low)
24Dcv_Rtn. Also while reviewing the wire
schematic you will see the wires labeled as a
(High) or (Low) input such as (Oven_On_L) for
the low input and (Door_Closed_H) for a high
input/output.
6.
Acv/Dcv. See the incoming power supply flow
chart (FIGURE 1).
NO OPERATION WITH THE MODE SWITCH
IN COOL DOWN
1.
Verify that the control panel circuit breaker is in
the on position.
2.
Check the outlet for proper power supply.
3.
Remove the LH body side panel and inspect the
motor inverter control to see if it is powered up
with 115Acv and if there are any error codes
present if so, see the attached fault code list for
troubleshooting. The display will show
00
if
there are no fault codes present while the motor
is not running. If no codes are present continue
or if a code is present see the programming fault
code troubleshooting flow chart in section 4
(FIGURE 1) page 15.
4.
Locate the logic board small vertical RH
connector
J1
using your voltmeter checking for
24Dcv between (J1-4) to the mode switch
terminal # 4 voltage should be present, if not
investigate the mode switch. Also check
between the
J1
connector (J1-4) to the inverter
connector BK-12 wire at CM2 for 24Dcv, if no
voltage check the IFB relay board connector
J3
.
5.
To bypass the mode switch and wire harness
use your voltmeter set to the 10amp red fuse
side with the black in COM then set your meter
to DC amps, now your meter is a fused jumper
wire. Now jump between the logic board
J1
connector (J1-1) to the motor speed inverter
GY-19 low signal at terminal # 2 of the inverter.
This should activate the inverter power up. See
the cool down operation troubleshooting flow
chart (FIGURE 3).
NO OPERATION WITH THE MODE SWITCH
IN HOT AIR
1.
Verify that the convection motor is running with
the door fully closed. If not see door switch
troubleshooting flow chart (FIGURE 7).
2.
Verify that the thermostat has powered up,
counted down and displaying a set temperature
along with the heat indicator light activated.
3.
Remove the LH body side panel and tilt the
control panel down for troubleshooting access.
