Lochinvar 402 - 2072 Service Manual page 38

3
Troubleshooting
Table 3E (continued from previous page) Troubleshooting Chart - Fault Messages Displayed on Operator Interface
FAULT
The unit has failed to prove burner flame
upon ignition.
No Flame Ign
(Will require a manual
reset. Press the RESET
button on the SMART
SYSTEM display to reset.)
HSI Current Low
Amp draw of the hot surface igniter did not
meet the minimum requirement of 2.6 amps.
(Will require a manual
reset once the condition
has been corrected. Press
the RESET button on the
SMART SYSTEM display
to reset.)
The main control board has detected an
Flame CKT
internal fault.
Error
38
Copper-fin II/IIE Boiler and Water Heater
DESCRIPTION CORRECTIVE ACTION
• Inspect igniter and associated wiring for damage and
connection. Reference page 27 of this manual for
removal and cleaning procedure.
necessary.
• Check for proper electrical grounding of unit.
• Check incoming supply gas pressure. Refer to the
Gas Connections Section in 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 correctly
installed and that there are no obstructions.
• Inspect the burners. Reference pages 28 and 29
of this manual for removal and cleaning procedures.
Replace if necessary.
• Refer to the Checking Manifold Gas Pressure and
Combustion Analysis Procedure on pages 29 and 30
of this manual for the proper settings.
• Check for 24 VAC to the gas valve during the ignition
attempt. If no voltage is present, check the wiring
between the gas valve and the main control board.
• Replace the wiring or the main control board as
necessary.
• Measure the amp draw of the hot surface igniter during
the trial for ignition stage.
replace the hot surface igniter.
• If more than 2.6 amps replace the control module.
• Replace the main control board.
Service Manual
Replace if
If less than 2.6 amps