Honeywell 7800 Series Product Data page 20

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