Specification Sheet

7800 SERIESS7800A2142 4Line LCD Keyboard Display Module
320011007 22
Fault Code System Failure
Fault 32 *Air-
flow Switch*
Combustion Airflow
Interlock fault.
Check wiring; correct any errors.
Inspect the fan; make sure there is no blockage of the air
intake and it is supplying air.
Make sure the Airflow Interlock Switches are working properly
and all switch contacts are free of contaminants.
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 G (ground). Line voltage
should be present.
If steps 1 through 4 are correct and the fault persists, replace
the relay module.
Fault 33
*Pre-Ignition
ILK*
Pre-Ignition interlock
fault.
Check wiring; correct any errors.
Inspect the Pre-Ignition Interlock switches and make sure
they function properly.
Check fuel valve operation. Valve must close within five
seconds.
Reset and sequence the relay module.
During STANDBY or PREPURGE, measure the voltage be-
tween terminal 20 and G (ground). For EC/RM7810, 7820,
7830, 7850, check voltage between terminal 17 and G. Line
voltage should be present. If not, the Pre-Ignition Interlock
switches could be defective and need replacing.
If the fault persists, replace the relay module.
Fault 34
*Control On*
CTL input was ener-
gized at the wrong time
for the relay module.
This fault implies a field
wiring error.
Check wiring; correct any errors.
Reset and sequence the relay module.
If fault persists, replace the relay module.
Fault 35
*Call Service*
Safety relay was off
when it should be on or
a fuse has blown.
Reset and sequence the relay module. If fault repeats, replace
relay module, but be sure to test for excessive loads on appro-
priate terminals described by fault code.
If fault does not repeat on next cycle, check for electrical
noise being coupled into the relay module through the loads
on appropriate terminals described by the fault code.
If fault persists, replace the relay module.
Fault 36
*Call Service*
Main valve terminal
was off when it should
be on.
Fault 37
*Call Service*
Pilot (ignition) valve
terminal was off when it
should be on.
Fault 38
*Call Service*
Ignition terminal was
off when it should be
on.
Fault 39
*Call Service*
V2S valve terminal
(usually terminal 21)
was off when it should
be on.
Fault 40
*Call Service*
Safety relay was on
when it should be off.
Fault
41*Main
Valve On*
Main valve terminal
was on when it should
be off.
WARNING
Explosion Hazard.
Can cause explosion, serious injury or death.
Remove system power, turn off fuel supply.
Check for wiring errors that could provide power to terminals
described by the fault. Correct any errors.
Re-power system; reset and sequence the relay module.
If fault persists, replace the relay module.
When fault is corrected, turn on fuel supply.
Fault 42
*Pilot Valve
On*
Pilot (ignition) valve
terminal was on when it
should be off.
Fault 43 *Ig-
nition On*
Ignition terminal was
on when it should be
off.
Fault 44
*Pilot Valve
2 On*
V2S valve terminal,
used as a pilot, is on
when it should be off.