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Troubleshooting – Lochinvar CREST 3 User Manual

Page 43

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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.

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