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Fault Code
Fault 32
Combustion Airflow Interlock
*Airflow Switch*
fault.
Fault 33
Preignition Interlock fault.
*Preignition ILK*
Fault 34
CTL input was energized at the
*Control On*
wrong time for the relay
module. This fault implies a
field wiring error.
Fault 35
Safety relay was off when it
*Call Service*
should be on or the internal
fuse has blown.
Fault 36
Main valve terminal was off
*Call Service*
when it should be on, or the
internal fuse has blown.
Fault 37
Pilot (ignition) valve terminal
*Call Service*
was off when it should be on, or
the internal fuse has blown.
Fault 38
Ignition terminal was off when it
*Call Service*
should be on, or the internal
fuse has blown.
Fault 39
V2S valve terminal (usually
*Call Service*
terminal 21) was off when it
should be on, or the internal
fuse has blown.
Fault 40
Safety relay was on when it
*Call Service*
should be off.
Fault 41
Main valve terminal was on
*Main Valve On*
when it should be off.
Fault 42
Pilot (ignition) valve terminal
*Pilot Valve On*
was on when it should be off.
Fault 43
Ignition terminal was on when it
*Ignition On*
should be off.
Fault 44
V2S valve terminal, used as a
*Pilot Valve 2 On*
pilot, is on when it should be off.
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Table 7. Hold and Fault Message Summary (Continued).
System Failure
1. Check wiring and correct any errors.
2. Inspect the fan; make sure there is no blockage of the air
3. Make sure the Airflow Interlock Switches are working properly
4. Reset and sequence the relay module to PREPURGE. Place
5. If steps 1 through 4 are correct and the fault persists, replace
1. Check wiring and correct any errors.
2. Inspect the Preignition Interlock switches and make sure they
3. Check fuel valve operation. Valve must close within five
4. Reset and sequence the relay module.
5. During STANDBY or PREPURGE, measure the voltage
6. If the fault persists, replace the relay module.
1. Check wiring and correct any errors.
2. Reset and sequence the relay module.
3. If fault persists, replace the relay module.
1. Reset and sequence the relay module. If fault repeats, replace
2. If fault does not repeat on next cycle, check for electrical noise
3. Possibly check for bouncing running on Lockout Interlock.
4. If fault persists, replace the relay module.
19
7800 SERIES S7800A KEYBOARD DISPLAY MODULE
Recommended Troubleshooting
intake and it is supplying air.
and 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.
function properly.
seconds.
between terminal 20 and L2(N). Line voltage should be
present. If not, the Preignition Interlock switches can be
defective and need replacing.
relay module, but be sure to test for excessive loads on
appropriate terminals described by fault code.
being coupled into the relay module through the loads on
appropriate terminals described by the fault code.
WARNING
Explosion Hazard.
Can cause severe injury, death or property damage.
1. Remove system power, turn off fuel supply.
2. Check for wiring errors that could provide power to
terminals described by the fault. Correct any errors.
3. Re-power system; reset and sequence the relay module.
4. If fault persists, replace the relay module.
5. When fault is corrected, turn on fuel supply.
65-0090—4
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