Honeywell 7800 SERIES Manual page 15

7800 SERIES S7800A1142 KEYBOARD DISPLAY MODULE
Fault Code
Fault 35 Safety relay was off when it
*Call Service* should be on or the internal
fuse has blown.
Fault 36 Main valve terminal was off
*Call Service* when it should be on, or the
internal fuse has blown.
Fault 37 Pilot (ignition) valve terminal
*Call Service* was off when it should be on, or
the internal fuse has blown.
Fault 38 Ignition terminal was off when it
*Call Service* should be on, or the internal
fuse has blown.
Fault 39 V2S valve terminal (usually
*Call Service* terminal 21) was off when it
should be on, or the internal
fuse has blown.
Fault 40 Safety relay was on when it
*Call Service* should be off.
Fault 41 Main valve terminal was on
*Main Valve On* when it should be off.
Fault 42 Pilot (ignition) valve terminal
*Pilot Valve On* was on when it should be off.
Fault 43 Ignition terminal was on when it
*Ignition On* should be off.
Fault 44 V2S valve terminal, used as a
*Pilot Valve 2 On* pilot, is on when it should be off.
Fault 45 Low Fire Interlock switch failure
*Low Fire Sw. Off* to close or stay closed.
Fault 46
*Flame Amp Type*
Fault 47 The configuration jumpers differ
*Jumpers Changed* from the sample taken at
startup.
Fault 48 V2S valve terminal, used as a
*Delayed MV On* delayed main valve, was on
(2nd Stage Valve) when it should be off.
65-0288-1
Table 7. Hold and Fault Message Summary. (Continued)
System Failure
Device specific.
Recommended Troubleshooting
1. Reset and sequence the relay module. If fault repeats, 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.
WARNING
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.
1. 1. Check wiring and correct any errors.
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.
1. Remove power to the device.
2. Reset the flame amplifier and reset and sequence the relay
module.
1. Inspect the jumper connections. Make sure that clipped
jumpers are completely removed.
2. Reset and sequence the relay module.
3. If fault persists, replace the relay module.
WARNING
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
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.
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