Submittal Sheet

7800 SERIES S7800A2142 KEYBOARD DISPLAY MODULE
32-00110—05 24
Fault 51
*Flame Too Strong*
Flame signal value is too high
to be valid.
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.
Fault 52
*Call Service*
Pilot Valve 2 (terminal 21)
was off when it should be on.
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.
Fault 53
*Lockout Switch*
Lockout Input fault
(EC/RM7850 only).
1. Check wiring and correct any errors.
2. Inspect the Lockout Switch to make sure it is working prop-
erly.
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.
Fault 54
*Comb. Pressure*
Combustion pressure switch
fault (Fulton pulse only).
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.
Fault 55
*Purge Fan Sw. On*
Purge fan switch is on when it
should be off (Fulton pulse
only).
1. Check wiring and correct any errors.
2. Inspect the Purge Fan Switch terminal 18 and its connec-
tions. 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.
Fault 56
*Block Intake*
Block intake fault (Fulton
pulse only).
1. Check wiring and correct any errors.
2. Inspect the Block Intake Switch and make sure it is working
properly.
3. Reset and sequence the relay module.
4.
During PREPURGE, measure the voltage between terminal
7 and L2(N). Supply voltage should be present. If not, the
Block Intake Switch is defective and needs replacing.
5. If the fault persists, replace the relay module.
Fault 57
*Purge Fan Sw. Off*
Purge Fan Switch is off when
it should be on (Fulton pulse
only).
1. Inspect the Prepurge Fan Switch terminal 18 and the
connections. Make sure the fan is working properly.
2. Reset and sequence the relay module.
3. If the fault persists, replace the relay module.
Fault 58 - 60
*Call Service*
Unused faults. —
Fault 61 MV1 Off (Terminal 9); should
be ON.
1. Check wiring and correct any errors.
2. Reset and sequence the control.
3. If fault persists, replace relay module (Before installing the
new relay module, verify current draw of terminal 9).
Table 5. Fault Message Summary. (Continued)
Fault Code System Failure Recommended Troubleshooting