Honeywell 7800 Series Product Data page 18

7800 SERIESS7800A2142 4-Line LCD Keyboard Display Module
Fault Code System Failure
Fault 2 *AC
Excess noise or device
Frequen/
running on slow AC.
Noise*
Fault 3 *AC
AC line dropout de-
Line Drop-
tected.
out*
Fault 4
Device running on fast
*AC Frequen-
AC.
cy*
Fault 5*Low
Low AC line detected.
Line Voltage*
Fault 6 Purge card timing
*Purge Card changed since card was
Error* initially read.
Fault 7
Flame sensed when
*Flame Am-
flame not present.
plifier*
Flame sensed when no
Fault 8
signal expected during
*Flame Amp/
shutter-check or Am-
Shutter*
pli-Check versions.
Flame sensed when
Fault 9
shutter open and no
*Flame
flame is expected
Detected*
during STANDBY.
Pre-Ignition Interlock
Fault 10
fault during STANDBY
*Pre-Ignition
*(EC/RM7800, 7840,
ILK*
7838B only).
Fault 11 Running Interlock
*Running ILK powered at improper
On* sequence point.
32-00110-07
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.
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.
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.
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.
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.
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.
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