Cleaver-Brooks CB780 - Fault Message and Recommended Troubleshooting

2-8 750-166
Fault Code System Failure Recommended Troubleshooting
Fault 01
*No Purge Card*
No card is plugged into the
purge card slot.
1. Assure the purge card is seated properly.
2. Inspect the purge card and the connector on the
relay module for damage or contaminants.
3. Reset and sequence the CB 780/CB 784.
4. If fault code reappears, replace the purge card.
5. Reset and sequence the CB 780/CB 784.
6. If fault persists, replace the relay module.
Fault 02
*AC Frequen/Noise*
Excess noise or device running
on slow AC.
1. Check the relay module and display module
connections.
2. Reset and sequence the CB 780/CB 784.
3. Check the CB 780/CB 784 power supply to
assure that both frequency and voltage meet
specifications.
4. Check the backup power supply as appropriate.
Fault 03
*AC Line Dropout*
AC Line dropout detected. 1. Check the relay module and display module
connections.
2. Reset and sequence the CB 780/CB 784.
3. Check the CB 780/CB 784 power supply to
assure that both frequency and voltage meet
specifications.
4. Check the backup power supply as appropriate.
Fault 04
*AC Frequency*
Device running on fast AC. 1. Check the relay module and display module
connections.
2. Reset and sequence the CB 780/CB 784.
3. Check the CB 780/CB 784 power supply to
assure that both frequency and voltage meet
specifications.
4. Check the backup power supply as appropriate.
Fault 05
*Low Line Voltage*
Low AC line detected. 1. Check the relay module and display module
connections.
2. Reset and sequence the CB 780/CB 784.
3. Check the CB 780/CB 784 power supply to
assure that both frequency and voltage meet
specifications.
4. Check the backup power supply as appropriate.
Fault 06
*Purge Card Error*
The purge card timing has
changed from the original
configuration.
1. Assure that 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 CB 780/CB 784.
4. If fault code reappears, replace the purge card.
5. Reset and sequence the CB 780/CB 784.
6. If code persists, replace relay module.
Fault 07
*Flame Amplifier*
Flame not sensed when checked
for a nonself-check version.
1. Check wiring; correct any errors.
2. Assure that the flame detector and flame
amplifier are compatible.
3. Remove the flame amplifier and inspect its
connections. Reseat the amplifier.
4. Reset and sequence the CB 780/CB 784.
5. If the code reappears, replace the flame amplifier
and/or the flame detector.
6. If fault persists, replace the relay module.
(Continued)
TABLE 4—FAULT MESSAGE AND RECOMMENDED TROUBLESHOOTING.