Specification Sheet

7800 SERIESS7800A2142 4Line LCD Keyboard Display Module
320011007 18
Fault Code System Failure
Fault 2 *AC
Frequen/
Noise*
Excess noise or device
running on slow AC.
Check the relay module and display module connections.
Reset and sequence the relay module.
Check the relay module power supply and make sure that
both frequency and voltage meet the specifications.
Check the backup power supply, as appropriate.
Fault 3 *AC
Line Drop-
out*
AC line dropout de-
tected.
Fault 4
*AC Frequen-
cy*
Device running on fast
AC.
Fault 5*Low
Line Voltage*
Low AC line detected.
Fault 6
*Purge Card
Error*
Purge card timing
changed since card was
initially read.
Make sure the purge card is seated properly.
Inspect the purge card and connector on the relay module for
damage or contaminants.
Reset and sequence the relay module.
If the fault code reappears, replace the purge card.
Reset and sequence the relay module.
If the fault persists, replace the relay module.
Fault 7
*Flame Am-
plifier*
Flame sensed when
flame not present.
Check wiring and correct any errors. Make sure that flame
sensor wires are in separate conduits. Check for noise cou-
pling into the flame detector leadwires.
Make sure that flame detector and flame amplifier are com-
patible.
Remove the flame amplifier and inspect connections. Reseat
the amplifier.
Reset and sequence the relay module.
If the code reappears, replace the amplifier and/or the flame
detector.
If the fault persists, replace the relay module.
Fault 8
*Flame Amp/
Shutter*
Flame sensed when no
signal expected during
shutter-check or Am-
pli-Check versions.
Fault 9
*Flame
Detected*
Flame sensed when
shutter open and no
flame is expected
during STANDBY.
Check that flame is not present in the combustion chamber;
correct any errors.
Check wiring and correct any errors. Make sure that flame
sensor wires are in separate conduits. Check for noise cou-
pling into flame detector leadwires.
Remove the flame amplifier and inspect its connections.
Reseat the amplifier. Reset and sequence the relay module.
If the code reappears, replace the amplifier and/or the flame
detector.
If the fault persists, replace the relay module.
Fault 10
*Pre-Ignition
ILK*
Pre-Ignition Interlock
fault during STANDBY
*(EC/RM7800, 7840,
7838B only).
Check wiring and correct any errors.
Check Pre-Ignition Interlock switches to assure proper func-
tioning.
Check fuel valve operation.
Reset and sequence the relay module; monitor the Pre-Igni-
tion Interlock status.
If the code persists, replace the relay module.
Fault 11
*Running ILK
On*
Running Interlock
powered at improper
sequence point.
Check wiring to make sure that interlocks are connected
properly between terminals 6 and 7. Correct any errors.
Reset and sequence the relay module.
If the fault persists, measure the voltage between terminals 6
and G (ground), then terminals 7 and G. If there is line supply
voltage present at terminal 6 when the controller is off, the
controller switch may be bad or is jumpered.
If steps 1 through 3 are correct and there is line supply volt-
age present at terminal 7 when the controller is closed and
the fault persists, check for a welded or jumpered Running
Interlock, Lockout Interlock, or Airflow Switch. Correct any
errors.
If steps 1 through 4 are correct and the fault persists, replace
the relay module.