Honeywell 7800 Series Product Data page 22

7800 SERIESS7800A2142 4-Line LCD Keyboard Display Module
Fault Code System Failure
Fault 32 *Air- Combustion Airflow
flow Switch* Interlock fault.
Fault 33
Pre-Ignition interlock
*Pre-Ignition
fault.
ILK*
CTL input was ener-
gized at the wrong time
Fault 34
for the relay module.
*Control On*
This fault implies a field
wiring error.
Safety relay was off
Fault 35
when it should be on or
*Call Service*
a fuse has blown.
Main valve terminal
Fault 36
was off when it should
*Call Service*
be on.
Pilot (ignition) valve
Fault 37
terminal was off when it
*Call Service*
should be on.
Ignition terminal was
Fault 38
off when it should be
*Call Service*
on.
V2S valve terminal
Fault 39 (usually terminal 21)
*Call Service* was off when it should
be on.
Fault 40 Safety relay was on
*Call Service* when it should be off.
Fault Main valve terminal
41*Main was on when it should
Valve On* be off.
Fault 42 Pilot (ignition) valve
*Pilot Valve terminal was on when it
On* should be off.
Ignition terminal was
Fault 43 *Ig-
on when it should be
nition On*
off.
Fault 44 V2S valve terminal,
*Pilot Valve used as a pilot, is on
2 On* when it should be off.
32-00110-07
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.
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.
Check wiring; correct any errors.
Reset and sequence the relay module.
If fault persists, replace the relay module.
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.
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.
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