Honeywell 7800 Series Product Data page 23

Fault Code System Failure
Fault 45 Low Fire Interlock
*Low Fire Sw. switch failure to close
Off* or stay closed.
This fault indicates:
a. The Flame Failure
Response Time (FFRT)
or TYPE input from
the amplifier changed
while the device was
Fault 46 powered; or
*Flame Amp b. A standard amplifier
Type* was used in a pilot valve
application; or
c. A three-second FFRT
Amplifier was used
with the relight option
on the RM7890 Relay
Module.
The configuration
Fault 47
jumpers differ from
*Jumpers
the sample taken at
Changed*
startup.
V2S valve terminal,
Fault 48
used as a delayed main
*Delayed MV
valve, was on when it
On*
should be off.
Fault 49
The manual open
*Manual -
switch was on when it
Open Switch
should be off.
On.*
7800 SERIESS7800A2142 4-Line LCD Keyboard Display Module
Check wiring; correct any errors.
Reset and sequence the relay module.
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.
While in Run, drive to Low Fire state, measure the voltage
between terminal 18 and G (ground). Line voltage should be
present. If not, the switch adjustment is incorrect and/or the
switch is defective and needs replacement.
If steps 1 through 4 are correct and the fault still persists,
replace the relay module.
Remove power to the device.
Reseat the flame amplifier and reset and sequence the relay
module.
For EC/RM7890 only; make sure that Jumper JR2 is com-
pletely clipped if a three-second FFRT amplifier is being used.
If Jumper JR2 is intact (relight option is selected), use 0.8
second FFRT amplifier.
For RM7838B only; make sure that a Shutter Check Flame
Amplifier is being used with the Pilot Valve Hold option select-
ed.
Inspect the jumper connections. Make sure that clipped
jumpers are completely removed.
Reset and sequence the relay module.
If fault persists, replace the relay module.
WARNING
Explosion Hazard.
Can cause explosion, serious injury or death.
Remove system power, turn off fuel supply.
Check wiring; correct any errors.
Inspect the V2S Fuel Valve and its connections. Make sure the
switch is working correctly and is not jumpered or welded.
Reset and sequence the relay module.
If fault persists, replace the relay module.
WARNING
Remove system power, turn off fuel supply.
Check wiring; correct any errors.
Inspect the Manual-Open Switch and its connections. Make
sure the switch is working correctly and is not jumpered or
welded.
Reset and sequence the relay module.
If fault persists, replace the relay module.
23 32-00110-07