Lochinvar CREST 3 - Manual (Page 43)

3
Troubleshooting
(continued)
Service Manual
43
Table 3G (continued from previous page) Troubleshooting Chart - Fault Messages Displayed on Boiler Interface
FAULT DESCRIPTION CORRECTIVE ACTION
Flame Failure
Running 2
(will require a manual
reset once the condition
has been corrected. Press
the RESET button on the
SMART TOUCH
display
to reset.)
The unit was running and lost the flame
signal.
• Inspect flame rod 2 and associated wiring for damage
and connection. Reference page 34 of this manual for
removal and cleaning procedures. Replace if
necessary.
• Check for proper electrical grounding of unit.
• Check incoming supply gas pressure. Natural and
L.P. gas pressures should be between 4 - 14 inches w.c.
(1.0 - 3.5 kPa). Refer to Section 6 - Gas Connections of
the Crest Installation and Operation Manual for detailed
information concerning the gas supply.
• Verify that the plastic hose from the gas valve to the air
inlet is connected and is not damaged.
• Verify that the vent/air intake pipes are installed correctly
and there are no obstructions.
• Inspect flame sensor and associated wiring. Reference
page 34 of this manual for removal and cleaning
procedures. Replace if necessary.
• Check combustion.
• Inspect the burner. Reference page 34 of this manual for
removal and cleaning procedures. Replace if
necessary.
Gas Valve / Relay
Failure 1
(will require a manual
reset once the condition
has been corrected. Press
the RESET button on the
SMART TOUCH
display
to reset.)
The main control board did not detect gas
valve 1.
• Check wiring harness connection at the gas valve and
at the main control board.
• Replace the gas valve wire harness.
• Replace the gas valve.
Gas Valve / Relay
Failure 2
(will require a manual
reset once the condition
has been corrected. Press
the RESET button on the
SMART TOUCH
display
to reset.)
The main control board did not detect gas
valve 2.
• Check wiring harness connection at the gas valve and
at the main control board.
• Replace the gas valve wire harness.
• Replace the gas valve.