Wiring - Honeywell 7800 SERIES Manual

7800 SERIES S7800A1142 KEYBOARD DISPLAY MODULE
Fault Code
Fault 56 Block intake fault (Fulton pulse
*Block Intake* only).
Fault 57 Purge Fan Switch is off when it
*Purge Fan Sw. Off* should be on (Fulton pulse
only).
Fault 58 - 60 Unused faults.
*Call Service*
Fault 61 MV1 Off (Terminal 9); should be
ON.
Fault 62 MV2 Off (Terminal 17); should
be ON.
Fault 63 MV1 ON (Terminal 9); should
be OFF.
Fault 64 MV2 ON (Terminal 17); should
be OFF.
Fault 65 Valve Proving Switch (Terminal
*VPS Off* 16) OFF; should be ON.
(VPS High Test)
Fault 66 Valve Proving Switch (Terminal
*VPS On* 16) ON; should be OFF.
(VPS Low Test)
Fault 67 L1 and L2
*AC Phase* miswired/exchanged
(EC/RM7850 only).
Fault 68 Pre-Ignition Interlock fault.
*Pre-Ignition ILK*
Faults 69 - 70 Unused faults.
*Call Service*
Fault 71 Low Fire Switch closed, High
*Dynamic LFS* Fire Switch must be open
(EC/RM 7850 only).
Fault 71 Limit Input (terminal 7) is off
*Limits Complete* when it should be on (RM7888
only).
65-0288-1
Table 7. Hold and Fault Message Summary. (Continued)
System Failure
1. Check wiring and correct any errors.
2. Inspect the Block Intake Switch and make sure it is working
3. Reset and sequence the relay module.
4. During PREPURGE, measure the voltage between terminal 7
5. If the fault persists, replace the relay module.
1. Inspect the Prepurge Fan Switch terminal 18 and the
2. Reset and sequence the relay module.
3. If the fault persists, replace the relay module.
—
1. Check wiring and correct any errors.
2. Reset and sequence the control.
3. If fault persists, replace relay module (Before installing the new
1. Check wiring and correct any errors.
2. Reset and sequence the control.
3. If fault persists, replace relay module (Before installing the new
1. Check wiring and correct any errors.
2. Reset and sequence the control.
3. If fault persists, replace relay module (Before installing the new
1. Check wiring and correct any errors.
2. Reset and sequence the control.
3. If fault persists, replace relay module (Before installing the new
1. Check wiring and correct any errors.
2. Check MV2 for leaking valve seat.
3. Reset and sequence control.
1. Check wiring and correct any errors.
2. Check MV1 for leaking valve seat.
3. Reset and sequence control.
1. Check L1 and L2 for proper line phasing.
1. Check wiring and correct any errors.
2. Inspect the Pre-Ignition Interlock switches and make sure they
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
6. If the fault persists, replace the relay module.
—
1. Check firing rate position switches (usually in Modutrol®
2. Check wiring and correct any errors.
3. Reset and sequence the relay module.
4. If the fault persists, replace the relay module.
1. Check limits to make sure they are satisfied after resetting.
2. Check electrical connections to terminal 7 of wiring subbase.
3. Reset relay module.
4. If the fault persists, replace the relay module.
22
Recommended Troubleshooting
properly.
and L2(N). Supply voltage should be present. If not, the Block
Intake Switch is defective and needs replacing.
connections. Make sure the fan is working properly.
relay module, verify current draw of terminal 9).
relay module, verify current draw of terminal 17).
relay module, verify current draw of terminal 9).
relay module, verify current draw of terminal 17).
work properly.
terminal 17 and L2(N). Supply voltage should be present. If not, the
Pre-Ignition Interlock switches are defective and need replacing.
Motor) for proper operation.