Specifications

– 19 –
SECTION VII - TROUBLE SHOOTING
continued
The POWER LED provides fault identifi cation when the Relay Module locks out on an alarm. Fault identifi cation is
a series of fast- and slow-blinking LED lights. The fast blinks identify the tens portion of the fault code (three fast
blinks is 30), while the slow blinks identify the units portion of the fault code (two slow blinks is 2). Three fast blinks
followed by two slow blinks would be fault code 32. This identifi es a running interlock on during STANDBY. (See
following Table for Blinking Fault Code List.)
The LED code repeats as long as the fault exists. To clear the fault, press the RESET button.
Code 1-1
*Low AC Line
Voltage*
Code 1-2
*AC Quality
Problem*
Code 2-1
*Unexpected
Flame Signal*
Code 2-2
*Flame Signal
Absent*
Code 2-3
*Flame Signal
Overrange*
Code 3-1
*Running/
Interlock Switch
Problem*
1. Check the relay module and display module connections.
2. Reset and sequence the Relay Module.
3. Check the 7800 power supply and make sure that frequency and voltage meet
specifi cations.
4. Check the backup power supply, as appropriate.
1. Check that fl ame is not present in the combustion chamber; correct any errors.
2. Make sure that the fl ame amplifi er and fl ame detector are compatible.
3. Check the wiring and correct any errors.
4. Remove the fl ame amplifi er and inspect its connections. Reseat the amplifi er.
5. Reset and sequence the relay module.
6. If the code reappears, replace the fl ame amplifi er and/or the fl ame detector.
7. If the fault persists, replace the relay module.
1. Measure the fl ame signal. If one exists, verify that it meets specifi cations.
2. Make sure that the fl ame amplifi er and fl ame detector are compatible.
3. Inspect the main fuel valve(s) and valve connection(s).
4. Verify that the fuel pressure is suffi cient to supply fuel to the combustion chamber.
Inspect the connections to the fuel pressure switches. Make sure they are
functioning properly.
5. Inspect the Airfl ow Switch and make sure that it is functioning properly.
6. Check the fl ame detector sighting position; reset and recycle. Measure the fl ame
signal strength. Verify that it meets specifi cations. If not, refer to the fl ame detector
and/or fl ame amplifi er checkout procedures in the installation instructions.
7. Replace the fl ame amplifi er and/or the fl ame detector, if necessary.
8. If the fault persists, replace the relay module.
1. Make sure the fl ame detector and fl ame amplifi er are compatible.
2. Remove the fl ame amplifi er and inspect its connections. Reset the fl ame amplifi er.
3. Reset and sequence the relay module.
4. Check the fl ame detector sighting position; reset and recycle. Measure fl ame
strength. Verify that it meets specifi cations. If not, refer to the fl ame detector
and/or fl ame amplifi er checkout procedures in the installation instructions.
5. If the code reappears, replace the fl ame amplifi er and/or the fl ame 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 supplying 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.
Blinking Fault Codes and Recommended Troubleshooting
Recommended TroubleshootingFault Code System Failure
Low AC Line detected.
Excessive noise or
device running on slow,
fast, or AC line dropout
detected.
Flame sensed when no
fl ame is expected during
STANDBY or PURGE.
No-fl ame time present
at the end of the PIlot
Flame Establishing
Period; lost during the
Main Flame Establishing
Period or during RUN.
Flame signal value is
too high to be valid.
Running or Lockout
Interlock fault during
Prepurge.