Honeywell S7800A Installation Manual page 20

7800 SERIES S7800A KEYBOARD DISPLAY MODULE
Fault Code
Fault 35
*Call Service*
Fault 36
*Call Service*
Fault 37
*Call Service*
Fault 38
*Call Service*
Fault 39
*Call Service*
Fault 40
*Call Service*
Fault 41
*Main Valve On*
Fault 42
*Pilot Valve On*
Fault 43
*Ignition On*
Fault 44
*Pilot Valve 2 On*
Fault 45
*Low Fire Sw. Off*
Fault 46
*Flame Amp Type*
Fault 47
*Jumpers Changed*
Fault 48
*Delayed MV On*
(2nd Stage Valve)
65-0090-6
Table 7. Hold and Fault Message Summary. (Continued)
System Failure
Safety relay was off when it
should be on or the internal
fuse has blown.
Main valve terminal was off
when it should be on, or the
internal fuse has blown.
Pilot (ignition) valve terminal
was off when it should be on, or
the internal fuse has blown.
Ignition terminal was off when it
should be on, or the internal
fuse has blown.
V2S valve terminal (usually
terminal 21) was off when it
should be on, or the internal
fuse has blown.
Safety relay was on when it
should be off.
Main valve terminal was on
when it should be off.
Pilot (ignition) valve terminal
was on when it should be off.
Ignition terminal was on when it
should be off.
V2S valve terminal, used as a
pilot, is on when it should be off.
Low Fire Interlock switch failure
to close or stay closed.
Device specific.
The configuration jumpers differ
from the sample taken at
startup.
V2S valve terminal, used as a
delayed main valve, was on
when it should be off.
Recommended Troubleshooting
1. Reset and sequence the relay module. If fault repeats, replace
relay module, but be sure to test for excessive loads on
appropriate terminals described by fault code.
2. 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.
3. Possibly check for bouncing running on Lockout Interlock.
4. If fault persists, replace the relay module.
WARNlNG
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.
1. 1. Check wiring and correct any errors.
2. 2. Reset and sequence the relay module.
3. 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 in the
Test position. Adjust the Low Fire Switch while in this state to
make sure it is closing properly.
4. 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. 5. If steps 1 through 4 are correct and the fault still persists,
replace the relay module.
1. Remove power to the device.
2. Reset the flame amplifier and reset and sequence the relay
module.
1. Inspect the jumper connections. Make sure that clipped
jumpers are completely removed.
2. Reset and sequence the relay module.
3. If fault persists, replace the relay module.
WARNlNG
Explosion Hazard.
Can cause severe injury, death or property damage.
1. Remove system power, turn off fuel supply.
2. Check wiring; correct any errors.
3. Inspect the V2S Fuel Valve and its connections. Make sure the
switch is working correctly and is not jumpered or welded.
4. Reset and sequence the relay module.
5. If fault persists, replace the relay module.
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