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7800 SERIES S7800A KEYBOARD DISPLAY MODULE
Fault Code
Fault 45
Low Fire Interlock switch failure
*Low Fire Sw. Off*
to close or stay closed.
Fault 46
*Flame Amp Type*
Fault 47
The configuration jumpers differ
*Jumpers Changed*
from the sample taken at
startup.
Fault 48
V2S valve terminal, used as a
*Delayed MV On*
delayed main valve, was on
(2nd Stage Valve)
when it should be off.
Fault 49
The manual open switch was
*Man-Open Sw. On*
on when it should be off.
Fault 50
The sequence logic detected a
*Jumpers Wrong*
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).
65-0090—4
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Table 7. Hold and Fault Message Summary (Continued).
System Failure
Device specific.
Recommended Troubleshooting
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.
WARNING
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.
WARNING
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.
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