Honeywell S7800A - Page 22

7800 SERIES S7800A KEYBOARD DISPLAY MODULE
65-009 0-6 22
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Table 7. Hold and Fault Message Summary. (Continued)
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Fault Code System Failure Recommended T
r
oubleshooting
Fault 56
*Block Intake*
Block in
t
ake fault (Fulton pulse
only).
1. Check wiring and correct any errors.
2. Inspect the Block Intake Switch and make sure it is working
properly.
3. Reset and sequence the relay module.
4. During PREPURGE, measure the voltage between terminal 7
and L2(N). Supply voltage should be present. If not, the Block
Intake Switch is defective
and needs replacing.
5. If the fault persists, replace the relay module.
Fault 57
*Purge Fan Sw. Off*
Pu
r
ge Fan S
w
itch is off
w
hen it
should be on (Fulton pulse
only).
1. Inspect the Prepurge Fan Switch terminal 18 and the
connections. Make sure the fan is working properly.
2. Reset and sequence the relay module.
3. If the fault persists, replace the relay module.
Fault 58
*Comb. Press/Flame*
Combustion Pressure Switch o
r
Flame Sense Fault (Fulton
Pulse Only)
1. If Combustion Pressure Switch is used - Terminal 20 was On
when it should be Off.
2. If Flame Amplifier is used - Flame sensed when it was not
expected.
3. Check wiring and correct any errors. Make sure flame sensor
wires are run in separate conduits. Check for noise
coupling
into flame detector leadwires.
4. Remove and reinstall amplifier.
5. Reset and sequence the relay module.
6. If fault persists, remove Pressure switch connection to terminal
20 or Flame detector wire to F terminal.
7. Reset and sequence the relay module.
8. If fault persists, replace the relay module and reconnect any
removed
wires.
Fault 59 - 60
*Call Service*
Unused faul
t
s. -
Fault 61 MV1 Off (Terminal 9); should be
ON.
1. Check wiring and correct any errors.
2. Reset and sequence the control.
3. If fault persists, replace relay module (Before installing the new
relay module, verify current draw of terminal 9).
Fault 62 MV2 Off (Terminal 17); should
be ON.
1. Check wiring and correct any errors.
2. Reset and sequence the control.
3. If fault persists, replace relay module (Before installing the new
relay module, verify current draw of terminal 17).
Fault 63 MV1 ON (Terminal 9); should
be OFF.
1. Check wiring and correct any errors.
2. Reset and sequence the control.
3. If fault persists, replace relay module (Before installing the new
relay module, verify current draw of terminal 9).
Fault 64 MV2 ON (Terminal 17); should
be OFF.
1. Check wiring and correct any errors.
2. Reset and sequence the control.
3. If fault persists, replace relay module (Before installing the new
relay module, verify current draw of terminal 17).
Fault 65
*VPS Off*
Valve Proving Switch (Terminal
16) OFF; should be ON.
(VPS High Test)
1. Check wiring and correct any errors.
2. Check MV2 for leaking valve seat.
3. Reset and sequence control.
Fault 66
*VPS On*
Valve Proving Switch (Terminal
16) ON; should be OFF.
(VPS Low Test)
1. Check wiring and correct any errors.
2. Check MV1 for leaking valve seat.
3. Reset and sequence control.
Fault 67
*AC Phase*
L1 and L2
miswired/exchanged
(EC/RM7850 only).
1. Check L1 and L2 fo
r
prope
r
line phasing.
Fault 68
*Pre-Ignition ILK*
Pre-Ignition Inte
r
lock fault. 1. Check wiring and correct any errors.
2. Inspect the Pre-Ignition Interlock switches and make sure they
work properly.
3.
Check fuel valve operation. Valve must close within five seconds.
4. Reset and sequence the relay module.
5.
During STANDBY or PREPURGE, measure the voltage between
terminal 17 and L2(N). Supply voltage should be present. If not, the
Pre-Ignition Interlock switches are defective and need replacing.
6. If the fault persists, replace the relay module.