Vulcan-Hart VC4ED Service Manual page 58

FULL SIZE ELECTRIC CONVECTION OVENS - TROUBLESHOOTING
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.
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.
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
Er07 - Zone 1 A/D overflow error
Er10 - Stack overflow error
Er11 - Open sensor error
Er12 - Shorted sensor
NOTE: 1. Should only see when a new EPROM is installed and powered for the first time.
F25105 (December 2001)
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
Open sensor
Microprocessor malfunction
Open sensor
• Incorrect sensor type
• Measuring temperature outside
the sensor range
Page 58 of 60
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.
• 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.
• Cycle power
• Check sensor and connections
for a reversed or open sensor
• Check the InP1 setup parameter.
Verify it matches your sensor.
• Check sensor and connections
for a reversed or open sensor
• Check the InP1 setup parameter.
Verify it matches your sensor.
• Check sensor and connections
for a reversed or open sensor