Lochinvar Copper-fin II/IIE 402 - 2072 - Manual (Page 43)

3
Troubleshooting
(continued)
43
FAULT DESCRIPTION CORRECTIVE ACTION
Service Blk While the unit is in Service Mode, the outlet
temperature has exceeded 185°F (85°C).
• 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.
Low Voltage 120 VAC input to the main control board has
dropped below 100 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 main control board.
Watch Dog Error The main control board has detected an
internal fault.
• Cycle main power.
• Replace the main control board.
Write EEProm The main control board has detected an
internal fault.
• Cycle main power.
• Replace the main control board.
Program EEProm The main control board has detected an
internal fault.
• Cycle main power.
• Replace the main control board.
CRC Parameters
The main control board has detected an
internal fault.
• Cycle main power.
• Replace the main control board.
• Restore default parameters using the PC program.
No Error Stored The main control board has detected an
internal fault.
• Press RESET.
• Cycle main power.
• Replace the main control board.
Table 3E (continued from previous page) Troubleshooting Chart - Fault Messages Displayed on Operator Interface
Copper-fin II/IIE Boiler and Water Heater Service Manual