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Fault Code
Fault 51
Flame signal value is too high
*Flame Too Strong*
to be valid.
Fault 52
Pilot Valve 2 (terminal 21) was
*Call Service*
off when it should be on.
Fault 53
Lockout Input fault
*Lockout Switch*
(EC/RM7850 only).
Fault 54
Combustion pressure switch
*Comb. Pressure*
fault (Fulton pulse only).
Fault 55
Purge fan switch is on when it
*Purge Fan Sw. On*
should be off (Fulton pulse
only).
Fault 56
Block intake fault (Fulton pulse
*Block Intake*
only).
Fault 57
Purge Fan Switch is off when it
*Purge Fan Sw. Off*
should be on (Fulton pulse
only).
FAult 58 - 66
Unused faults.
*Call Service*
Fault 67
L1 and L2
*AC Phase*
miswired/exchanged
(EC/RM7850 only).
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Table 7. Hold and Fault Message Summary (Continued).
System Failure
1. Make sure that flame detector and flame amplifier are
2. Remove the flame amplifier and inspect the connections.
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
6. Measure the flame strength. Verify it meets specifications. If
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
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
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
3. Reset and sequence the relay module.
4. During STANDBY and PREPURGE, measure the voltage
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.
3. Reset and sequence the relay module.
4. If the fault persists, replace the relay module.
1. Check wiring and correct any errors.
2. Inspect the Block Intake Switch and make sure it is working
3. Reset and sequence the relay module.
4. During PREPURGE, measure the voltage between terminal 7
5. If the fault persists, replace the relay module.
1. Inspect the Prepurge Fan Switch terminal 18 and the
2. Reset and sequence the relay module.
3. If the fault persists, replace the relay module.
—
1. Check L1 and L2 for proper line phasing.
21
7800 SERIES S7800A KEYBOARD DISPLAY MODULE
Recommended Troubleshooting
compatible.
Reset the flame amplifier.
routing.
not, refer the flame amplifier and/or flame detector checkout
procedures.
is operating properly.
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.
working correctly.
between terminal 20 and L2(N). Supply voltage should be
present. If not, the Combustion Pressure Switch is defective
and needs replacing.
Make sure the switch is working correctly and is not jumpered
or welded.
properly.
and L2(N). Supply voltage should be present. If not, the Block
Intake Switch is defective and needs replacing.
connections. Make sure the fan is working properly.
65-0090—4
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