Honeywell 7800 Series Product Data page 24

7800 SERIESS7800A2142 4-Line LCD Keyboard Display Module
Fault Code System Failure
The sequence logic
detected a combination
of jumpers that is illegal
for the sequence e.g.,
Fault 50
if it is correct to clip
*Jumpers
Jumper JR1 or Jumper
Wrong*
JR2, but not both, this
fault would be used
when both are clipped
(RM7888 only).
Fault 51
Flame signal value is
*Flame Too
too high to be valid.
Strong*
Pilot Valve 2 (terminal
Fault 52 *In-
21) was off when it
ternal fault*
should be on.
Fault 53 Lockout Input fault
*Lockout (EC/RM7810, 7820,
Switch* 7830, 7850 only).
Fault 54 Combustion pressure
*Combustion switch fault (Fulton
Pressure* pulse only).
Fault 55 Purge fan switch is on
*Purge Fan when it should be off
Sw. On* (Fulton pulse only).
Fault 56
Block intake fault (Ful-
*Block
ton pulse only).
Intake*
32-00110-07
Inspect the jumpers and refer to the installation instructions
for compatible jumper configurations.
Make sure that clipped jumpers are completely removed.
Reset and sequence the relay module.
If fault persists, replace the relay module.
Make sure that flame detector and flame amplifier are com-
patible.
Remove the flame amplifier and inspect the connections.
Reset the flame amplifier. Reset and sequence the relay
module.
Check the flame detector sighting position, reset and cycle.
Verify that no ignition noise is present in the F lead due to
wire routing.
Measure the flame strength. Verify it meets specifications.
If not, refer to the flame amplifier and/or flame detector
checkout procedures. If the code reappears, replace the flame
amplifier and/or the flame detector.
If the fault persists, replace the relay module.
Inspect terminal 21 and connections.
Make sure that the valve is operating properly.
Reset and sequence the relay module. If the fault persists,
replace the relay module.
Check wiring; correct any errors.
Inspect the Lockout Switch to make sure it is working prop-
erly.
Reset and sequence the relay module.
During STANDBY or PREPURGE, measure the voltage be-
tween
terminal 20 and G (ground). Supply voltage should be pres-
ent. If not, the lockout switch is defective and needs replacing.
If the fault persists, replace the relay module.
Check wiring; correct any errors.
Inspect the Combustion Pressure Switch to make sure it is
working correctly.
Reset and sequence the relay module.
During STANDBY or PREPURGE, measure the voltage be-
tween
terminal 20 and G (ground). Supply voltage should be pres-
ent. If not, the Combustion Pressure Switch is defective and
needs replacing.
If the fault persists, replace the relay module.
Check wiring; correct any errors.
Inspect the Purge Fan Switch terminal 18 and its connec-
tions. Make sure the switch is working correctly and is not
jumpered or welded.
Reset and sequence the relay module.
If the fault persists, replace the relay module.
Check wiring; correct any errors.
Inspect the Block Intake Switch and make sure it is working
properly.
Reset and sequence the relay module.
During PREPURGE, measure the voltage between terminal 7
and G (ground). Supply voltage should be present. If not, the
Block Intake Switch is defective and needs replacing.
If the fault persists, replace the relay module.
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