Honeywell S7800A - Page 20

7800 SERIES S7800A KEYBOARD DISPLAY MODULE
65-009 0-6 20
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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 35
*Call Service*
Safet
y
r
elay was off
w
hen it
should be on or the internal
fuse has blown.
1. Reset and sequence the rela
y
module. If fault repea
t
s, replace
relay module, but be sure to test for excessive loads on
appropriate terminals described by fault code.
2. If fault does not repeat on next cycle, check for electrical noise
being coupled into the relay module through the loads on
appropriate terminals described by the fault code.
3. Possibly check for
bouncing running on Lockout Interlock.
4. If fault persists, replace the relay module.
Fault 36
*Call Service*
Main valve terminal was off
when it should be on, or the
internal fuse has blown.
Fault 37
*Call Service*
Pilot (ignition) valve terminal
was off when it should be on, or
the internal fuse has blown.
Fault 38
*Call Service*
Ignition terminal was off
w
hen it
should be on, or the internal
fuse has blown.
Fault 39
*Call Service*
V2S valve terminal (usually
terminal 21) was off when it
should be on, or the internal
fuse has blown.
Fault 40
*Call Service*
Safet
y
r
elay was on when it
should be off.
Fault 41
*Main Valve On*
Main valve terminal was 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 for wiring errors that could provide power to
terminals described by the fault. Correct any errors.
3. Re-power system; reset and sequence the relay module.
4. If fault persists, replace the relay
module.
5. When fault is corrected, turn on fuel supply.
Fault 42
*Pilot Valve On*
Pilot (ignition) valve terminal
was on when it should be off.
Fault 43
*Ignition On*
Ignition terminal was on when it
should be off.
Fault 44
*Pilot Valve 2 On*
V2S valve terminal, used as a
pilot, is on when it should be off.
Fault 45
*Low Fire Sw. Off*
Lo
w
Fire Interlock switch failure
to close or stay closed.
1. 1. Check wiring and correct an
y
e
r
ro
r
s.
2. 2. Reset and sequence the relay module.
3. 3. Use either the manual motor position to drive the motor to
the Low Fire position, or use the Run/Test Switch option, if
available. Sequence to Run, drive to Low Fire and place in the
Test position. Adjust the Low Fire Switch while
in this state to
make sure it is closing properly.
4. 4. While in Run, drive to Low Fire state, measure the voltage
between terminal 18 and L2(N). Line voltage should be
present. If not, the switch adjustment is incorrect and/or the
switch is defective and needs replacement.
5. 5. If steps
1 through 4 are correct and the fault still persists,
replace the relay module.
Fault 46
*Flame Amp Type*
Device specific. 1. Remove powe
r
to the device.
2. Reset the flame amplifier and reset and sequence the relay
module.
Fault 47
*Jumpers Changed*
The configuration jumpers diffe
r
from the sample taken at
startup.
1. Inspect the jumpe
r
connections. Make sure that clipped
jumpers are completely removed.
2. Reset and sequence the relay module.
3. If fault persists, replace the relay module.
Fault 48
*Delayed MV On*
(2nd Stage Valve)
V2S valve terminal, used as a
delayed main valve, was 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 V2S Fuel Valve and its connections. Make sure th
e
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.