Honeywell S7800A - Page 21

7800 SERIES S7800A KEYBOARD DISPLAY MODULE
21 65-009 0-6




Table 7. Hold and Fault Message Summary. (Continued)

Fault Code System Failure Recommended Troubleshooting
Fault 49
*Man-Open Sw. On*
The manual open s
w
itch
w
as
on when it should be off.
WARNlNG
Explosion Hazard.
Can cause severe injury, death or property damage.
1. Remove system power, turn off fuel supply.
2. Check wiring; correct any errors.
3. Inspect the Manual-Open Switch and its connections.
Make sure the switch is working correctly and is not
jumpered or welded.
4. Reset and sequence the relay module.
5. If fault persists, replace the relay module.
Fault 50
*Jumpers Wrong*
The sequence logic detected a
combination of jumpers that is
illegal for the sequence, e.g., if
it is correct to clip jumper JR1 or
Jumper JR2, but not both, this
fault would be used when both
are clipped (Device specific).
1. Inspect the jumpe
r
s and refe
r
to the ins
t
allation instructions fo
r
compatible jumper configurations .
2. Make sure that clipped jumpers are completely removed.
3. Reset and sequence the relay module.
4. If fault persists, replace the relay module.
Fault 51
*Flame Too Strong*
Flame signal value is too high
to be valid.
1. Make su
r
e that flame detector and flame amplifier a
r
e compatible.
2. Remove the flame amplifier and inspect the connections.
Reset the flame amplifier.
3. Reset and sequence the relay module.
4. Check the flame detector sighting position, reset and cycle.
5. Verify that no ignition noise is present in the F lead due to wire
routing.
6. Measure the flame strength. Verify
it meets specifications. If
not, refer the flame amplifier and/or flame detector checkout
procedures.
7. If the code reappears, replace the flame amplifier.
8. If the code reappears, replace the flame detector.
9. If the fault persists, replace the relay module.
Fault 52
*Call Service*
Pilot Valve 2 (terminal 21) was
off when it should be on.
1. Inspect terminal 21 and connections. Make sure that the valve
is operating properly.
2. Reset and sequence the relay module.
3. If the fault persists, replace the relay module.
Fault 53
*Lockout Switch*
Lockout Input fault
(EC/RM7850 only).
1. Check wi
r
ing and correct any errors.
2. Inspect the Lockout Switch to make sure it is working properly.
3. Reset and sequence the relay module. During STANDBY or
PREPURGE, measure the voltage between terminal 20 and
L2(N). Supply voltage should be present. If not, the lockout
switch is defective and needs replacing.
4. If the
fault persists, replace the relay module.
Fault 54
*Comb. Pressure*
Combustion pressure s
w
itch
fault (Fulton pulse only).
1. Check wi
r
ing and correct any errors.
2. Inspect the Combustion Pressure Switch to make sure it is
working correctly.
3. Reset and sequence the relay module.
4. During STANDBY and PREPURGE, measure the voltage
between terminal 20 and L2(N). Supply voltage should be
present. If not, the Combustion Pressure Switch is defective
and needs replacing.
5.
If the fault persists, replace the relay module.
Fault 55
*Purge Fan Sw. On*
Pu
r
ge fan s
w
itch is on
w
hen it
should be off (Fulton pulse
only).
1. Check wi
r
ing and correct any errors.
2. Inspect the Purge Fan Switch terminal 18 and its connections.
Make sure the switch is working correctly and is not jumpered
or welded.
3. Reset and sequence the relay module.
4. If the fault persists, replace the relay module.