Lochinvar Copper-fin II/IIE 402 - 2072 - Manual (Page 39)

3
Troubleshooting
(continued)
39
FAULT DESCRIPTION CORRECTIVE ACTION
No Flame
Running
(Will require a manual
reset once the condition
has been corrected. Press
the RESET button on the
SMART SYSTEM
display
to reset.)
The unit was running and lost the flame signal. • Inspect igniter and associated wiring for damage and
connection. Reference page 27 of this manual for
removal and cleaning procedure. Replace if
necessary.
• Check for proper electrical grounding of unit.
• Check incoming supply gas pressure. Refer to the
Gas Connections Section of the Installation and
Operation Manual for detailed information concerning
the gas supply.
• Verify that the tube from the gas valve to the
combustion air chamber is connected and is not
damaged.
• Verify that the vent/air intake pipes are installed
correctly and there are no obstructions.
• Refer to the Checking Manifold Gas Pressure and
Combustion Analysis Procedure on pages 29 and 30
of this manual for the proper settings.
• Inspect the burners. Reference pages 28 and 29
of this manual for removal and cleaning procedures.
Replace if necessary.
• Replace the main control board.
Auto Reset
High Limit
The outlet water temperature has exceeded the
setting of the automatic reset high limit. • 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
heating system. Refer to the Water Connections
Section of the Installation and Operation Manual for
the proper piping methods for the Copper-fin.
• Check 120 VAC to 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
pump is not operating, replace the pump.
• If the system pump is a variable speed pump,
ensure that the system flow is not less than the
boiler
flow.
• Check temperature setting of the main control
board.
• Check resistance of water sensors and compare to
Table 3B on page 35 of this manual. Replace
sensor if necessary.
• Replace outlet sensor.
Table 3E (continued from previous page) Troubleshooting Chart - Fault Messages Displayed on Operator Interface
Copper-fin II/IIE Boiler and Water Heater Service Manual