750-166 2-9
TABLE 4—FAULT MESSAGE AND RECOMMENDED TROUBLESHOOTING (Continued).
Fault Code System Failure Recommended Troubleshooting
Fault 08
*Flame Amp/Shutr*
Flame sensed when checked for
shutter-check or ampli-check
versions.
1. Check wiring; correct any errors.
2. Assure that the flame detector and flame
amplifier are compatible.
3. Remove the flame amplifier and inspect its
connections. Reseat the amplifier.
4. Reset and sequence the CB 780/CB 784.
5. If the code reappears, replace the flame amplifier
and/or the flame detector.
6. If fault persists, replace the relay module.
Fault 09
*Flame Detected*
Flame sensed when shutter open
and no flame is expected during
Standby.
1. Check that flame is not present in the combustion
chamber; correct any errors.
2. Check wiring; correct any errors.
3. Remove the flame amplifier and inspect its
connections. Reseat the amplifier.
4. Reset and sequence the CB 780/CB 784.
5. If the code reappears, replace the flame amplifier
and/or the flame detector.
6. If fault persists, replace the relay module.
Fault 10
*Preignition ILK*
Preignition interlock fault during
Standby.
1. Check wiring; correct any errors.
2. Check Preignition Interlock switches to assure
proper functioning.
3. Check fuel valve operation.
4. Reset and sequence the CB 780/CB 784; monitor
the Preignition interlock status.
5. If code persists, replace the relay module.
Fault 12
*Lockout ILK On*
Lockout Interlock powered at
improper point in sequence.
1. Check wiring to assure that the Lockout
Interlocks are connected properly between
terminals 6 and 7. Correct any errors.
2. Reset and sequence the CB 780/CB 784.
3. If the fault persists, measure the voltage between
terminals 6 and G (ground), then terminal 7 and
G (ground). If there is 120 Vac at terminal 6
when the controller is off, the Controller switch
may be bad or is jumpered.
4. If steps 1 through 3 are correct and there is
120 Vac at terminal 7 while the controller is
closed and the fault persists, check for a welded
or jumpered Running Interlock, Lockout
Interlock or Airflow switch. Correct any errors.
5. If steps 1 through 4 are correct and the fault
persists, replace the relay module.
(Continued)
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