A.O. Smith 120 through 250 Series - Manual (Page 80)

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Instruction manual BFC 80
C02 (lock out error)
Error message from the
appliance controller.
Incorrect reference
voltage from the AD
converter.
1. Reset electronic controller.
2. Check that the frequency of the power supply is
compliant (3.4.2 "General and electrical specifications") . If this
is not the case, contact your installation engineer
3. If the frequency is correct but the error persists, replace the
electronic controller.
To replace the necessary parts, you must contact your installation
engineer
Internal error message
from the appliance
controller.
• EEPROM read
error
• 50 Hz error
• Internal
communication
error
Internal error message
from the appliance
controller.
• Gas valve relay
error
• Safety relay error
• Ignition relay error
• RAM error
• EEPROM error
• EEPROM contents
do not match the
software version
• Processor software
error
C03 (blocking error)
Reset error
Too many resets in too
short a period.
Wait for the error to disappear (maximum 1 hour). If the error does
not disappear, replace the appliance controller.
To replace the necessary parts, you must contact your installation
engineer
C04 (blocking error)
Appliance selection
error
Incorrect appliance
selection / Incorrect
selection resistor
1. Check whether the correct appliance is selected (12.5 "Display
the selected appliance") .
2. If the correct appliance is selected, fit the correct selection
resistor.
3. If incorrect appliance selected, select the correct one.
If the error cannot be resolved or is persistent, contact your
installation engineer
To replace the necessary parts, you must contact your installation
engineer
Code + Description Cause Solution Remark