2-14 750-166
TABLE 4—FAULT MESSAGE AND RECOMMENDED TROUBLESHOOTING (Continued).
(Continued)
Fault Code System Failure Recommended Troubleshooting
Fault 44
*Pilot Valve 2 On*
V2S valve terminal, used as a
pilot, was on when it should be
off.
1. Warning! Remove system power; turn off fuel
supply.
2. Check wiring to terminal 21; correct any errors.
3. Inspect the Pilot Fuel Valve 2 and connections.
Assure that switch is functioning correctly and is
not jumpered or welded.
4. Reset and sequence the CB 780/CB 784.
5. If the fault persists, replace the relay module.
Fault 45
*Low Fire Sw. Off*
Low fire interlock switch failure
to close or stay closed.
1. Check wiring; correct any errors.
2. Reset and sequence the CB 780/CB 784.
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
the LOW FIRE position and place the switch in
the TEST position. Adjust the Low Fire switch
while in this state to assure that it is closing
properly.
4. While in the Drive to Low Fire state, measure the
voltage between terminals 19 and G (ground).
120 Vac should be present. If not, the switch
adjustment is incorrect and/or the switch is
defective and should be replaced.
5. If steps 1 through 4 are correct and the fault still
persists, replace the relay module.
Fault 47
*Jumpers Changed*
The configuration jumpers differ
from the sample taken at startup.
1. Inspect the jumper connections. Assure that
clipped jumpers were completely removed.
2. Reset and sequence the CB 780/CB 784.
3. If fault persists, replace the relay module.
Fault 50
*Jumpers Wrong*
The sequence logic detected a
combination of jumpers that is
illegal for the sequence (e.g., if it
was correct to clip jumper 1 or
jumper 2, but not both, this fault
would be used if both were
clipped).
1. Inspect jumpers and consult the instruction and
installation guide for compatible jumper
configurations. Assure clipped jumpers are
completely removed.
2. Reset and sequence the CB 780/CB 784.
3. If fault persists, replace the relay module.
Fault 51
*Flame Too Strong*
Flame signal value is too high to
be valid.
1. Assure that flame detector and flame amplifier
are compatible.
2. Remove the flame amplifier and inspect its
connectors. Reset the flame amplifier.
3. Reset and sequence the CB 780/CB 784.
4. Check the flame detector sighting position, reset
and cycle. Measure flame strength. Does it meet
specifications? If not, refer to flame detector
and/or flame amplifier checkout procedures in
installation instructions.
5. If the code reappears, replace the flame amplifier
and/or the flame detector.
6. If fault persists, replace the relay module.
Fault 52
*Internal Fault*
Pilot Valve 2 terminal was off
when it should be on.
1. Inspect Pilot terminal 21 and connections. Assure
that Pilot is functioning properly.
2. Reset and sequence the CB 780/CB 784.
3. If fault persists, replace the relay module.
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