Service Manual

3 Troubleshooting (continued)

Table 3G (continued from previous page) Troubleshooting Chart - Fault Messages Displayed on Boiler Interface

FAULT

DESCRIPTION

CORRECTIVE ACTION

 

 

 

 

 

• 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.

Flame Failure

 

(1.0 - 3.5 kPa). Refer to Section 6 - Gas Connections of

 

the Crest Installation and Operation Manual for detailed

Running 2

 

 

information concerning the gas supply.

(will require a manual

 

The unit was running and lost the flame

• Verify that the plastic hose from the gas valve to the air

reset once the condition

has been corrected. Press

signal.

inlet is connected and is not damaged.

the RESET button on the

 

• Verify that the vent/air intake pipes are installed correctly

SMART TOUCH display

 

and there are no obstructions.

to reset.)

 

• 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

 

• Check wiring harness connection at the gas valve and

(will require a manual

The main control board did not detect gas

at the main control board.

reset once the condition

• Replace the gas valve wire harness.

has been corrected. Press

valve 1.

• Replace the gas valve.

the RESET button on the

 

SMART TOUCH display

 

 

to reset.)

 

 

 

 

 

Gas Valve / Relay

 

 

Failure 2

 

• Check wiring harness connection at the gas valve and

(will require a manual

The main control board did not detect gas

at the main control board.

reset once the condition

• Replace the gas valve wire harness.

has been corrected. Press

valve 2.

• Replace the gas valve.

the RESET button on the

 

SMART TOUCH display

 

 

to reset.)

 

 

 

 

 

43

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Lochinvar 2.5, 1.5, 3.5 service manual Gas Valve / Relay Failure, Unit was running and lost the flame

3, 2, 3.5, 2.5, 1.5 specifications

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