Service Manual

3 Troubleshooting
44
Service Manual
Table 3-4 (continued from previous page) Troubleshooting Chart - Fault Messages Displayed on Boiler Interface
FAULT DESCRIPTION CORRECTIVE ACTION
Outlet Temp
High
Outlet water temperature has exceeded the
maximum outlet water temperature.
• Verify that the system is full of water and that all air
has been properly purged from the system.
• Verify that the boiler is piped properly into the heating
system. Refer to Section 6 - Hydronic Piping of the
Knight Wall Mount Installation and Operation Manual
the proper piping methods for the Knight wall mount
boiler.
• Check for 120 vac to the boiler pump motor on a call
for heat. If voltage is not present, check wiring back
to the main control board. Replace the main control
board if necessary.
• If 120 vac is present on a call for heat and the boiler
pump is not operating, replace the pump.
• Verify that the boiler pump is set to the proper speed
or that the boiler pump is the proper size. Reference
Section 6 - Hydronic Piping of the Knight Wall Mount
Boiler Installation and Operation Manual for boiler
pump specifications.
• Replace the main control board.
Low 24 vac
120 vac input to the main control board has
dropped below 80 vac.
• Check 120 vac supply to the transformer.
• Check wiring connections at the low voltage
terminal strip.
• Check the wire size/length to remote devices.
• Replace the transformer.
Fatal Error
The control module has detected parameter
settings that are out of range.
• Restore the parameter defaults from the optional PC
software.
• Replace the control module.
Memory Error
A lockout occurs at the same time as a
power outage.
• Reset control module.