RM7800L1087; RM7840G1022,L1075; EC7840L1014 RELAY MODULES WITH VALVE PROVING
23 66-1162—2
TROUBLESHOOTING
Troubleshooting can be accomplished by using the S7800
Keyboard Display Module (KDM) or a blinking POWER LED.
The POWER LED provides fault identification when the relay
module locks out on an alarm. Fault identification 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. (See Table 10 for Blink Fault Code
list.)
The LED code repeats as long as the fault exists. To clear the
fault, press the RESET button.
Use Table 10 to identify fault code numbers, possible system
failure and recommended troubleshooting procedures.
Table 10. Blinking Fault Codes and Recommended Troubleshooting.
Blink Code System Failure Recommended Troubleshooting
Code 1-1
*Low AC Line
Voltage*
Low AC Line detected. 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
specifications.
4. Check the backup power supply, as appropriate.
Code 1-2
*AC Quality
Problem*
Excessive noise or
device running on slow,
fast, or AC line dropout
detected.
Code 2-1
*Unexpected
Flame Signal*
Flame sensed when no
flame is expected during
STANDBY or PURGE.
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.
Code 2-2
*Flame Signal
Absent*
No-flame time present
at the end of the PIlot
Flame Establishing
Period; lost during the
Main Flame Establishing
Period or during RUN.
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.
Code 2-3
*Flame Signal
Overrange*
Flame signal value is
too high to be valid.
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.
Code 3-1
*Running/
Interlock Switch
Problem*
Running or Lockout
Interlock fault during
Pre-Purge.
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 Pre-Purge (place the TEST/RUN
Switch in the TEST position, if available). Measure the voltage between
terminal 7 and G (ground); line voltage 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.
To Next Page
Loading...
