A.O. Smith 120 through 250 Series, Installation, User And Service Manual

Page: 84 / 104

is
Instruction manual BFC 82
C02 (lock out error)
Error message from the
controller.
Incorrect reference
voltage from the AD
converter.
1. Reset controller.
2. Check that the frequency of the power supply is
compliant (3.4.2 "General and electrical specifications"). If not,
contact your installation engineer
3. If the frequency is correct but the error persists, replace the
controller.
To replace the necessary parts, you must contact your installation
engineer
Internal error message
from the controller.
• EEPROM read
error
• 50 Hz error
• Internal
communication
error
Internal error message
from the 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 water heater controller.
To replace the necessary parts, you must contact your installation
engineer
C04 (blocking error)
Appliance selection
error
Incorrect water heater
selection/Incorrect
selection resistor
1. Check whether the correct water heater is
selected (3.4.2 "General and electrical specifications").
2. If the correct water heater is selected, fit the correct selection
resistor.
3. If incorrect water heater 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 Measure Remark