Honeywell 7800 Series Installation Instructions Manual page 15

Table 8. Blinking Fault Codes and Recommended Troubleshooting. (Continued)
Fault Code System Failure
Code 2-3 Flame signal value is
*Flame Signal too high to be valid.
Overrange*
Code 3-1 Running or Lockout
*Running/ Interlock fault during
Interlock Switch Prepurge.
Problem*
Code 3-2 Lockout Interlock
*Running/ powered at improper
Interlock On point in sequence or On
During in Standby.
Standby*
Code 3-3 VPS (Valve Proving
*VPS in Switch) in wrong state
Improper State* during VPS Test.
Code 4-1 No purge card or the
*Purge Card purge card timing has
Problem* changed from the
original configuration.
Code 4-2 Pilot (ignition) valve
*Wiring terminal, main valve,
Problem/ ignition or Main Valve 2
Internal Fault* was on when it should
be off.
Code 4-3 Flame not sensed, or
*Flame sensed when it should
Amplifier be on or off.
Problem*
RM7897A1002, RM7897C1000 7800 SERIES RELAY MODULES
Recommended Troubleshooting
1. Make sure the flame detector and flame amplifier are compatible.
2. Remove the flame amplifier and inspect its connections. Reset the flame
amplifier.
3. Reset and sequence the relay module.
4. Check the flame detector sighting position; reset and recycle. Measure flame
strength. Verify that it meets specifications. If not, refer to the flame detector
and/or flame amplifier checkout procedures in the installation instructions.
5. If the code reappears, replace the flame amplifier and/or the flame detector.
6. If the fault persists, replace the relay module.
1. Check wiring; correct any errors.
2. Inspect the fan; make sure there is no air intake blockage and that it is supply-
ing air.
3. Make sure the Lockout Interlock switches are functioning properly and the
contacts are free from contaminants.
4. Reset and sequence the relay module to Prepurge (place the TEST/RUN
Switch in the TEST position, if available). Measure the voltage between
terminal 7 and G (ground); 120 Vac should be present. Switch TEST/RUN
back to RUN.
5. If steps 1 through 4 are correct and the fault persists, replace the relay module.
1. Check wiring to make sure that the Lockout Interlocks are connected properly
between terminals 6 and 7. Correct any errors.
2. Reset and sequence the relay module.
3. If the fault persists, measure the voltage between terminal 6 and G (ground),
then between terminal 7 and G. 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 when the
controller is closed and the fault persists, check for a welded or jumpered
Running 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, making sure upstream valve is connected to terminal 9 and
downstream valve is connected to terminal 17.
2. Conduct Valve Seat leakage test using a manometer.
3. Reset and sequence the relay module; if fault repeats, test VPS (connected to
terminal 16) is functioning properly; replace if necessary.
4. Reset and sequence the relay module.
5. If fault persists, replace the relay module.
1. Make sure the purge card is seated properly.
2. Inspect the purge card and the connector on the relay module for any damage
or contaminants.
3. Reset and sequence the relay module.
4. If the fault code reappears, replace the purge card.
5. Reset and sequence the relay module.
6. If the fault code persists, replace the relay module.
WARNING
Electrical Shock Hazard; Fire or Explosion Hazard.
Can cause severe injury, death or property damage.
Remove system power and turn off power supply.
1. Remove system power and turn off fuel supply.
2. Check wiring; correct any errors.
3. inspect Pilot Fuel Valve(s), both places, and connections.
4. Reset and sequence the relay module.
5. If the fault persists, replace the relay module.
1. Check wiring; correct any errors.
2. Make sure the flame amplifier and flame detector are compatible.
3. Remove the flame amplifier and inspect the connections. Reseat the amplifier.
4. Reset and sequence the relay module.
5. If the code reappears, replace the flame amplifier and/or the flame detector.
6. If the fault persists, replace the relay module.
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