Honeywell S7800A User Manual

7800 SERIES S7800A KEYBOARD DISPLAY MODULE
19 65-009 0-6
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Table 7. Hold and Fault Message Summary. (Continued)
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Fault Code System Failure Recommended Troubleshooting
Fault 29
*Lockout ILK*
Lockout Interlock fault. 1. Check wi
r
ing and correct any errors.
2. Inspect the fan; make sure that there is no blockage of the air
intake and that it is supplying air.
3. Make sure that the Lockout Interlock Switches are working
properly and that all switch contacts are free from
contaminants.
4. Reset and sequence the relay module to
PREPURGE (place
the Run/Test Switch in the Te st position, if available). Measure
the voltage between terminals 7 and L2(N). Line voltage
should be present.
5. If steps 1 through 4 are correct and the fault persists, replace
the relay module.
Fault 30
*Running ILK*
Running Inte
r
lock fault. 1. Inspect the Running Inte
r
locks, including the Airflo
w
Switch,
and the connections.
2. Make sure that the Running Interlocks, including the Airflow
Switch, are functioning properly and that switch contacts are
free from contaminants.
3. Reset and sequence the relay module to PREPURGE. Set the
Run/Test Switch, if available, to Test. Measure the voltage
between terminal 7 and L2(N). Line voltage should be present.
4. If steps 1 through 3 are correct and the fault persists, replace
the relay module.
Fault 31
*Low Fire Sw. Off*
Lo
w
Fire Interlock Switch failure
to close during RUN (Device
specific).
1. Check wi
r
ing and correct any errors.
2. Reset and sequence the relay module.
3. Use either the manual motor position to drive the motor to the
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.
4. While in Run, drive to Low Fire state, measure the voltage
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.
5. Reset and
sequence the relay module. If line voltage was
present between the Low Fire Switch and terminal 18, and the
fault persists, replace the relay module.
Fault 32
*Airflow Switch*
Combustion Airflo
w
Interlock
fault.
1. Check wi
r
ing and correct any errors.
2. Inspect the fan; make sure there is no blockage of the air
intake and it is supplying air.
3. Make sure the Airflow Interlock Switches are working properly
and all switch contacts are free from contaminants.
4. Reset and sequence the relay module to PREPURGE. Place
the Run/Test
Switch in the Test position, if available. Measure
the voltage between terminals 7 and L2(N). Line voltage
should be present.
5. If steps 1 through 4 are correct and the fault persists, replace
the relay module.
Fault 33
*Pre-Ignition ILK*
Pre-Ignition Inte
r
lock fault. 1. Check wi
r
ing and correct any errors.
2. Inspect the Pre-Ignition Interlock switches and make sure they
function properly.
3. Check fuel valve operation. Valve must close within five
seconds.
4. Reset and sequence the relay module.
5. During STANDBY or PREPURGE, measure the voltage
between terminal 20 and L2(N). Line voltage should be
present. If
not, the Pre-Ignition Interlock switches can be
defective and need replacing.
6. If the fault persists, replace the relay module.
Fault 34
*Control On*
CTL input was energized at the
wrong time for the relay
module. This fault implies a
field wiring error.
1. Check wi
r
ing and correct any errors.
2. Reset and sequence the relay module.
3. If fault persists, replace the relay module.

Honeywell S7800A Specifications

General

Brand	Honeywell
Model	S7800A
Category	Control Unit
Language	English