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7800 SERIES S7800A KEYBOARD DISPLAY MODULE
Fault Code
Fault 11
Running Interlock powered at
*Running ILK On*
improper sequence point.
Fault 12
Lockout Interlock powered at
*Lockout ILK On*
improper sequence point.
Fault 13
Combustion airflow interlock
*Airflow Sw. On*
fault during STANDBY.
Fault 14
High Fire Interlock Switch
*High Fire Sw.*
failure to close during
PREPURGE.
Fault 15
Flame sensed when no flame is
*Flame Detected*
expected during STANDBY.
Fault 16
No-flame detected during Pilot
*Flame-Out Timer*
Flame Establishing Period.
Fault 17
Main flame failure during RUN
*Main Flame Fail*
after flame is established an on
for at least 10 seconds.
65-0090—4
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Table 7. Hold and Fault Message Summary (Continued).
System Failure
1. Check wiring to make sure that interlocks are connected
2. Reset and sequence the relay module.
3. If the fault persists, measure the voltage between terminals 6
4. If steps 1 through 3 are correct and there is line supply voltage
5. If steps 1 through 4 are correct and the fault persists, replace
1. Check wiring and correct any errors.
2. Reset and sequence the relay module.
3. Use either the manual motor potentiometer to drive the motor
4. Measure the voltage between terminal 19 and L2(N) while in
5. Reset and sequence the relay module. If the line supply
1. Check that the flame is not present in the combustion
2. Make sure that the flame amplifier and flame detector are
3. Check wiring and correct any errors.
4. Remove the flame amplifier and inspect the connections.
5. Reset and sequence the relay module.
6. If the code reappears, replace the amplifier and/or the flame
7. If the fault persists, replace the relay module.
1. Measure the flame signal. If one exists, make sure it meets
2. Make sure that the flame amplifier and flame detector are
3. If the code reappears, replace the amplifier and/or the flame
4. If the fault persists, replace the relay module.
1. Inspect the main fuel valve(s) and connection(s).
2. Make sure that the fuel pressure is high enough to supply fuel
3. Check the flame detector sighting for adequate flame signal
16
Recommended Troubleshooting
properly between terminals 6 and 7. Correct any errors.
and L2(N) (ground), then terminals 7 and L2(N). If there is line
supply voltage present at terminal 6 when the controller is off,
the controller switch may be bad or jumpered.
present at terminal 7 when the controller is closed and the fault
persists, check for a welded or jumpered Running Interlock,
Lockout Interlock, or Airflow Switch. Correct any errors.
the relay module.
to the High Fire position or use the Run/Test Switch option, if
available. Sequence to Prepurge drive to High Fire and place
in the Test position. Adjust the High Fire Switch while in this
state to make sure that it closes properly.
the Prepurge drive to High Fire state. Line supply voltage
should be present. If not, the switch adjustment is incorrect
and/or the switch is defective and needs replacing.
voltage was present between the High Fire Switch and terminal
19, and the fault still persists, replace the relay module.
chamber; correct any errors.
compatible.
Reset the flame amplifier.
detector.
specifications. Make any necessary burner adjustments using
manufacturer instructions.
compatible.
detector.
to the combustion chamber.
throughout the burner firing rate.
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