Lochinvar 402 - 2072 Service Manual page 43

3
Troubleshooting
Table 3E (continued from previous page) Troubleshooting Chart - Fault Messages Displayed on Operator Interface
FAULT
While the unit is in Service Mode, the outlet
Service Blk
temperature has exceeded 185°F (85°C).
120 VAC input to the main control board has
Low Voltage
dropped below 100 VAC.
The main control board has detected an
Watch Dog Error
internal fault.
The main control board has detected an
Write EEProm
internal fault.
The main control board has detected an
Program EEProm
internal fault.
CRC Parameters
The main control board has detected an
internal fault.
The main control board has detected an
No Error Stored
internal fault.
Copper-fin II/IIE Boiler and Water Heater
(continued)
DESCRIPTION CORRECTIVE ACTION
• Establish a heating load to remove heat from the
system.
• Verify that the system is full of water and that all air
has been properly purged from the system.
• Verify that the appliance is piped properly into the
system. Refer to the Water Connections Section of
the Installation and Operation Manual for the proper
piping methods.
• Check 120 VAC to the pump motor on a call for
heat. If voltage is not present, check the wiring
leading to the main control board. Replace the main
control board if necessary.
• If 120 VAC is present on a call for heat and the
pump is not operating, replace the pump.
• 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 main control board.
• Cycle main power.
• Replace the main control board.
• Cycle main power.
• Replace the main control board.
• Cycle main power.
• Replace the main control board.
• Cycle main power.
• Replace the main control board.
• Restore default parameters using the PC program.
• Press RESET.
• Cycle main power.
• Replace the main control board.
Service Manual
43