Honeywell S7800A Installation Manual page 21

Fault Code
Fault 49
*Man-Open Sw. On*
Fault 50
*Jumpers Wrong*
Fault 51
*Flame Too Strong*
Fault 52
*Call Service*
Fault 53
*Lockout Switch*
Fault 54
*Comb. Pressure*
Fault 55
*Purge Fan Sw. On*
Table 7. Hold and Fault Message Summary. (Continued)
System Failure
The manual open switch was
on when it should be off.
The sequence logic detected a
combination of jumpers that is
illegal for the sequence, e.g., if
it is correct to clip jumper JR1 or
Jumper JR2, but not both, this
fault would be used when both
are clipped (Device specific).
Flame signal value is too high
to be valid.
Pilot Valve 2 (terminal 21) was
off when it should be on.
Lockout Input fault
(EC/RM7850 only).
Combustion pressure switch
fault (Fulton pulse only).
Purge fan switch is on when it
should be off (Fulton pulse
only).
7800 SERIES S7800A KEYBOARD DISPLAY MODULE
Recommended Troubleshooting
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 Manual-Open Switch 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.
1. Inspect the jumpers and refer to the installation instructions for
compatible jumper configurations.
2. Make sure that clipped jumpers are completely removed.
3. Reset and sequence the relay module.
4. If fault persists, replace the relay module.
1. Make sure that flame detector and flame amplifier are compatible.
2. Remove the flame amplifier and inspect the connections.
Reset the flame amplifier.
3. Reset and sequence the relay module.
4. Check the flame detector sighting position, reset and cycle.
5. Verify that no ignition noise is present in the F lead due to wire
routing.
6. Measure the flame strength. Verify it meets specifications. If
not, refer the flame amplifier and/or flame detector checkout
procedures.
7. If the code reappears, replace the flame amplifier.
8. If the code reappears, replace the flame detector.
9. If the fault persists, replace the relay module.
1. Inspect terminal 21 and connections. Make sure that the valve
is operating properly.
2. Reset and sequence the relay module.
3. If the fault persists, replace the relay module.
1. Check wiring and correct any errors.
2. Inspect the Lockout Switch to make sure it is working properly.
3. Reset and sequence the relay module. During STANDBY or
PREPURGE, measure the voltage between terminal 20 and
L2(N). Supply voltage should be present. If not, the lockout
switch is defective and needs replacing.
4. If the fault persists, replace the relay module.
1. Check wiring and correct any errors.
2. Inspect the Combustion Pressure Switch to make sure it is
working correctly.
3. Reset and sequence the relay module.
4. During STANDBY and PREPURGE, measure the voltage
between terminal 20 and L2(N). Supply voltage should be
present. If not, the Combustion Pressure Switch is defective
and needs replacing.
5. If the fault persists, replace the relay module.
1. Check wiring and correct any errors.
2. Inspect the Purge Fan Switch terminal 18 and its connections.
Make sure the switch is working correctly and is not jumpered
or welded.
3. Reset and sequence the relay module.
4. If the fault persists, replace the relay module.
21 65-0090-6