Honeywell 7800 Series Manual page 11

Fault Code
Fault 11 Running Interlock powered at
*Running ILK On* improper sequence point.
Fault 12 Lockout Interlock powered at
*Lockout ILK On* improper point in sequence.
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
*Flame Detected* is expected during
STANDBY.
Fault 16 No-flame detected during
*Flame-Out Timer* Pilot Flame Establishing
Period.
Fault 17 Main flame failure during RUN
*Main Flame Fail* after flame is established and
on for at least 10 seconds.
Table 3. Hold and Fault Message Summary (continued).
System Failure
1.
2.
3.
4.
5.
1.
2.
3.
4.
5.
1.
2.
3.
4.
5.
6.
7.
1.
2.
3.
4.
1.
2.
3.
7800 SERIES RELAY MODULES
Recommended Troubleshooting
Check wiring to make sure that interlocks are connected
properly between terminals 6 and 7. Correct any errors.
Reset and sequence the relay module.
If the fault persists, measure the voltage between terminals 6
and G (ground), then terminals 7 and G. If there is line supply
voltage present at terminal 6 when the controller is off, the
controller switch may be bad or is jumpered.
If steps 1 through 3 are correct and there is line supply
voltage 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.
If steps 1 through 4 are correct and the fault persists, replace
the relay module.
Check wiring and correct any errors.
Reset and sequence the relay module.
Use either the manual motor potentiometer to drive the motor
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.
Measure the voltage between terminal 19 and G (ground)
while in 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.
Reset and sequence the relay module. If line supply voltage
was present between the High Fire Switch and terminal 19,
and the fault still persists, replace the relay module.
Check that the flame is not present in the combustion
chamber; correct any errors.
Make sure that the flame amplifier and flame detector are
compatible.
Check wiring and correct any errors.
Remove the flame amplifier and inspect the connections.
Reseat the amplifier.
Reset and sequence the relay module.
If the code reappears, replace the amplifier and/or the flame
detector.
If the fault persists, replace the relay module.
Measure the flame signal. If one exists, make sure it meet
specifications. Make any necessary burner adjustments using
manufacturer instructions.
Make sure that the flame amplifier and flame detector are
compatible.
If the code reappears, replace the amplifier and/or the flame
detector.
If the fault persists, replace the relay module.
Inspect the main fuel valve(s) and connection(s).
Make sure that the fuel pressure is high enough to supply
fuel to the combustion chamber.
Check the flame detector sighting for adequate flame signal
throughout the burner firing rate.
11
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65-0229—1