Honeywell 7800 Series Product Data page 19

Fault Code System Failure
Fault 12 Lockout Interlock pow-
*Lockout ILK ered at improper point
On* in sequence.
Fault 13 Combustion airflow
*Airflow Sw. interlock fault during
On* STANDBY.
Fault 14 High Fire Interlock
*High Fire Switch failure to close
Sw.* during PREPURGE.
Fault 15 Flame sensed when
*Flame no flame is expected
Detected* during STANDBY.
Fault 16 No flame detected
*Flame-Out during Pilot Flame
Timer* Establishing Period.
Main flame failure
Fault 17
during RUN after flame
*Main Flame
is established and on
Failure*
for at least 10 seconds.
Flame sensed when
Fault 18
shutter is open and
*Flame
no flame is expected
Detected*
during PREPURGE.
7800 SERIESS7800A2142 4-Line LCD Keyboard Display Module
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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 cham-
ber; 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 meets
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.
Check that flame is not present in the combustion chamber.
Correct any errors.
Make sure that the flame amplifier and flame detector are
compatible.
Check the wiring and correct any errors. Make sure F and
G wires are in individual conduits and protected from stray
noise pickup.
Remove the flame amplifier and inspect the connectors.
Reseat the flame amplifier.
Reset and sequence the relay module.
If the code reappears, replace the flame amplifier and/or the
flame detector.
If the fault persists, replace the relay module.
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