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7800 SERIES S7800A KEYBOARD DISPLAY MODULE
Fault Code
Fault 27
Start Switch was on during
*Start Switch On*
PREPURGE (Device specific).
Fault 28
Pilot flame failure.
*Pilot Flame Fail*
Fault 29
Lockout Interlock fault.
*Lockout ILK*
Fault 30
Running Interlock fault.
*Running ILK*
Fault 31
Low Fire Interlock Switch failure
*Low Fire Sw. Off*
to close during RUN (Device
specific).
65-0090—4
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Table 7. Hold and Fault Message Summary (Continued).
System Failure
1. Start Switch held on too long.
2. Check wiring; verify that Start Switch is correctly connected.
3. Make sure that the Start Switch is functioning properly and that
4. Reset and sequence the relay module to PREPURGE; set the
5. If steps 1 through 4 are correct and the fault persists, replace
1. Check pilot valve wiring and operation. Correct any errors.
2. Check fuel supply.
3. Check pilot pressure and repeat pilot turndown test.
4. Check ignition transformer electrode, flame detector, flame
5. If steps 1 through 4 are correct and the fault persists, replace
1. Check wiring and correct any errors.
2. Inspect the fan; make sure that there is no blockage of the air
3. Make sure that the Lockout Interlock Switches are working
4. Reset and sequence the relay module to PREPURGE (place
5. If steps 1 through 4 are correct and the fault persists, replace
1. Inspect the Running Interlocks, including the Airflow Switch,
2. Make sure that the Running Interlocks, including the Airflow
3. Reset and sequence the relay module to PREPURGE. Set the
4. If steps 1 through 3 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 position to drive the motor to the
4. While in Run, drive to Low Fire state, measure the voltage
5. Reset and sequence the relay module. If line voltage was
18
Recommended Troubleshooting
the switch contacts are free of contaminants.
Run/Test Switch to Test. Make sure there is no power at
terminal 6 during PREPURGE.
the relay module.
detector sighting and flame amplifier.
the relay module.
intake and that it is supplying air.
properly and that all switch contacts are free from
contaminants.
the Run/Test Switch in the Test position, if available). Measure
the voltage between terminals 7 and L2(N). Line voltage
should be present.
the relay module.
and the connections.
Switch, are functioning properly and that switch contacts are
free from contaminants.
Run/Test Switch, if available, to Test. Measure the voltage
between terminal 7 and L2(N). Line voltage should be present.
the relay module.
Low Fire position, or use the Run/Test Switch option, if
available. Sequence to Run drive to Low Fire and place the
switch in the Test position. Adjust the Low Fire Switch while in
this state to make sure it is closing properly.
between terminal 18 and L2(N). Line voltage should be
present. If not, the switch adjustment is incorrect and/or the
switch is defective and needs replacement.
present between the Low Fire Switch and terminal 18, and the
fault persists, replace the relay module.
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