Vulcan-Hart ML-126743 Service Manual page 63

VC4E & VC6E Series Full Size Electric Convection Ovens - TROUBLESHOOTING
SYMPTOM
Blower motor doesn't run with power switch in "ON" or
"COOL DOWN" position.
Error Codes
In the display window, the error code will
alternate between the code and the oven cavity
temperature or dashes if the oven is calling for
heat (heat light on). The exact error code
displayed will depend on the priority assigned to
the problem in the EPROM'S software. The lower
the error code number, the higher the priority. If
more than one problem occurs at the same time,
the error code assigned to the higher priority
problem will be displayed. Refer to the error code
table below to solve the problem. If the lower
priority problem still exists, the next error code
will be displayed. When the condition causing the
error is resolved, normal oven operation can
resume.
CODE & PROBLEM
Er01 - ROM checksum error
Er02 - RAM checksum error
Er03 - Ambient sensor error
Er04 - Configuration error
1
Er05 - EPROM error
Er06 - Zone 1 A/D underflow error
POSSIBLE CAUSES
1. Line voltage incorrect.
2. Power switch (S1) malfunction.
3. Fan speed switch (S3) malfunction.
4. Solid sate relay (SSR) malfunction. See SOLID
STATE RELAY TEST under COMPUTER
CONTROL.
5. Interconnecting wiring malfunction.
6. Motor inoperative.
7. Computer control malfunction. See COMPUTER
CONTROL OPERATIONAL TEST.
NOTE: To check a "Setup Parameter" and its
corresponding "Data Value", see SETUP MODE
under COMPUTER CONTROL.
NOTE: If the cause of the error is not apparent, check
for these conditions as they may also cause errors to
occur: Electrical noise or a noise event, excess
environmental moisture or temperature, or vibration.
PROBABLE CAUSE
Internal ROM malfunction
Internal RAM malfunction
Ambient temperature is below 32°F
Microprocessor malfunction
Power loss while storing data
• Incorrect sensor type
• Measuring temperature outside
the sensor range
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SOLUTION
Cycle power
Cycle power
Check ambient temperature at the
control.
Cycle power
Cycle power
• Check the InP1 setup
parameter. Verify it matches
your sensor.
• Check sensor and connections
for a reversed or open sensor. If
the condition causing the error is
resolved, the error will clear.
F25105 Rev. B (0217)