Honeywell 7800 Series Product Data page 13

Table 4. Fault Message and Recommended Troubleshooting (continued) .
Fault Code
Fault 10 Preignition interlock fault
Preignition ILK during Standby.
Fault 11 Running interlock powered
Running ILK On at improper point in
sequence.
Fault 12 Lockout interlock powered
Lockout ILK On at improper point in
sequence.
Fault 13 Combustion airflow
Airflow Sw. On interlock fault during
Standby.
Fault 14 High fire interlock switch
High Fire Sw. failure to close during
prepurge.
System Failure
1. Check wiring, correct any errors.
2. Check Preignition Interlock switches to assure that they function
properly.
3. Check fuel valve operation.
4. Reset and sequence the 7800, monitor the Pre-ignition interlock
status.
5. If code persists, replace the relay module.
1. Check wiring to assure that the Running Interlocks are connected
properly between terminals 6 and 7. Correct any errors.
2. Reset and sequence the 7800.
3. If the fault persists, measure the voltage between terminals 6 and
G (ground), then terminal 7 and G (ground). If there is 120 Vac at
terminal 6 when the controller is off, the controller switch may be
bad or is jumpered.
4. If steps 1 through 3 are correct and there is 120 Vac at terminal 7
while the controller is closed and the fault persists, check for a
welded or jumpered Running Interlock, Lockout Interlock or Airflow
Switch. Correct any errors.
5. If steps 1 through 4 are correct and the fault persists, replace the
relay module.
1. Check wiring to insure that the Lockout Interlocks are connected
properly between terminals 6 and 7. Correct any errors.
2. Reset and sequence the 7800.
3. If the fault persists, measure the voltage between terminals 6 and G
(ground), then terminal 7 and G (ground). If there is 120 Vac at
terminal 6 when the controller is off, the controller switch may be
bad or is jumpered.
4. If steps 1 through 3 are correct and there is 120 Vac at terminal 7
while the controller is closed and the fault persists, check for a
welded or jumpered Running Interlock, Lockout Interlock or Airflow
Switch. Correct any errors.
5. If steps 1 through 4 are correct and the fault persists, replace the
relay module.
1. Check wiring to assure that the Airlock Switch is connected
properly between terminals 6 and 7. Correct any errors.
2. Reset and sequence the 7800.
3. If the fault persists, measure the voltage between terminals 6 and G
(ground), then terminal 7 and G (ground). If there is 120 Vac at
terminal 6 when the controller is off, the controller switch may be
bad or is jumpered.
4. If steps 1 through 3 are correct and there is 120 Vac at terminal 7
while the controller is closed and the fault persists, check for a
welded or jumpered Running Interlock, Lockout Interlock or Airflow
Switch. Correct any errors.
5. If steps 1 through 4 are correct and the fault persists, replace the
relay module.
1. Check wiring, correct any errors.
2. Reset and sequence the 7800.
3. Use either the manual motor potentiometer to drive the motor to the
High Fire position or use the Run/Test Switch option (if available)
sequence to Prepurge drive to High Fire and place in the Test
position. Adjust the High Fire switch while in this state to assure that
it is closing properly.
4. Measure the voltage between terminal 18 and G (ground) while in
the Prepurge drive to High Fire state. 120 Vac should be present. If
not, the switch adjustment is incorrect and/or the switch is defective
and should be replaced.
5. Reset and sequence the 7800. If 120 Vac was present between the
High Fire switch and terminal 18, and the fault still persists, replace
the relay module.
7800 SERIES S7800B DISPLAY MODULE
Recommended Troubleshooting
13
(continued)
65-0219—1