Honeywell R7120M 7800 Serie Instructions D'installation page 10

R7120M 7800 SERIES RELAY MODULES
Fault Code System Failure
Code 1-1 Low AC Line detected.
*Low AC Line
Voltage*
Code 1-2 Excessive noise or
*AC Quality device running on slow,
Problem* fast, or AC line dropout
detected.
Code 2-1 Flame sensed when no
*Unexpected flame is expected during
Flame Signal* STANDBY or PURGE.
Code 2-2 No-flame time present
*Flame Signal at the end of the PIlot
Absent* Flame Establishing
Period; lost during the
Main Flame Establishing
Period or during RUN.
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 Not Applicable.
66-1193EF—01
Table 7. Blinking Fault Codes and Recommended Troubleshooting.
1. Check the relay module and display module connections.
2. Reset and sequence the Relay Module.
3. Check the power supply and make sure that frequency and voltage meet spec-
ifications.
4. Check the backup power supply, as appropriate.
1. Check that flame is not present in the combustion chamber; correct any errors.
2. Make sure that the flame amplifier and flame detector are compatible.
3. Check the wiring and correct any errors.
4. Remove the flame amplifier and inspect its connections. Reseat the amplifier.
5. Reset and sequence the relay module.
6. If the code reappears, replace the flame amplifier and/or the flame detector.
7. If the fault persists, replace the relay module.
1. Measure the flame signal. If one exists, verify that it meets specifications.
2. Make sure that the flame amplifier and flame detector are compatible.
3. Inspect the main fuel valve(s) and valve connection(s).
4. Verify that the fuel pressure is sufficient to supply fuel to the combustion
chamber. Inspect the connections to the fuel pressure switches. Make sure
they are functioning properly.
5. Inspect the Airflow Switch and make sure that it is functioning properly.
6. Check the flame detector sighting position; reset and recycle. Measure the
flame signal strength. Verify that it meets specifications. If not, refer to the
flame detector and/or flame amplifier checkout procedures in the installation
instructions.
7. Replace the flame amplifier and/or the flame detector, if necessary.
8. If the fault persists, replace the relay module.
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 6 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 7 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 6 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.
6.
Recommended Troubleshooting
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