Service Manual

3 Troubleshooting

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

FAULT

DESCRIPTION

CORRECTIVE ACTION

 

Sensor Open

 

• Check the sensors and their associated wiring.

(will require a manual

 

Repair or replace the sensor or wiring if damaged.

reset once the condition

Either the inlet water or outlet water

• Measure the resistance of the sensors and compare

has been corrected. Press

temperature sensor has been disconnected.

the resistance to the tables on page

38

of this

the RESET button on the

 

manual.

 

 

display to reset.)

 

 

 

 

• Replace the sensor if necessary.

 

 

 

 

 

 

 

 

 

 

Sensor Shorted

 

• Check the sensors and their associated

wiring.

 

Repair or replace the sensor or wiring if damaged.

(will require a manual

 

Either the inlet water or outlet water

• Measure the resistance of the sensors and compare

reset once the condition

has been corrected. Press

temperature sensor has been shorted.

the resistance to the tables on page 38 of this

the RESET button on the

 

manual.

 

 

display to reset.)

 

• Replace the sensor if necessary.

 

 

 

 

 

 

 

 

 

Flue Sensor

 

• Check the sensor and its associated wiring. Repair

 

or replace the sensor or wiring if damaged.

 

Open

 

• Measure the resistance of the sensors and compare

(will require a manual

 

The flue sensor has been disconnected or

the resistance to the tables on page 38 of this

reset once the condition

has been corrected. Press

removed from the flue.

manual.

 

 

the RESET button on the

 

• Replace the sensor in flue.

 

 

display to reset.)

 

 

 

 

• Replace the sensor if necessary.

 

 

 

 

 

 

 

 

 

 

Flue Sensor

 

• Check the sensor and its associated wiring.

Repair

Shorted

 

or replace the sensor or wiring if damaged.

 

(will require a manual

 

• Measure the resistance of the sensors and compare

reset once the condition

The flue sensor has been shorted.

the resistance to the tables on page 38 of this

has been corrected. Press

the RESET button on the

 

manual.

 

 

display to reset.)

 

• Replace the sensor if necessary.

 

 

 

 

 

 

 

 

Sensors equipped with an internal limit (such

• Check the tank temperature.

 

 

Tank Open

as the Lochinvar Squire® Indirect Tank), the

• Repair or replace the sensor wiring if damaged.

 

limit has opened due to temperature (195°F)

• Replace the sensor if necessary.

 

 

 

or the sensor has become disconnected.

 

 

 

 

• Check the wiring connections to switch. Wires should

 

 

be connected to the common and normally open

 

 

terminals.

 

 

 

 

• Remove switch and check for blockage in the orifice.

 

 

• Vent/air intake lengths exceed the maximum allowed

Blower Proving

 

lengths. Refer to Section 2 - General Venting of the

 

Crest Installation and Operation Manual for

Switch Open 1

 

proper lengths.

 

 

(will require a manual

Blower proving pressure switch 1 contacts

• Check for obstruction or blockage in the vent/air

reset once the condition

has been corrected. Press

are open.

intake pipes or at terminations.

 

 

• Inspect the burner. Reference page 34 of this manual

the RESET button on the

 

 

for removal and cleaning procedures.

Replace if

display to reset.)

 

 

necessary.

 

 

 

 

 

 

 

 

• Verify combustion air blower 1 is operating. Replace if

 

 

necessary.

 

 

 

 

• Inspect the heat exchanger. Reference page 35 of

 

 

this manual for removal and cleaning procedures.

 

 

• Faulty pressure switch. Replace switch.

 

 

 

 

 

 

 

48

Page 48
Image 48
Lochinvar 2.5, 1.5, 3.5 service manual Sensor Open, Sensor Shorted, Flue Sensor, Tank Open, Blower Proving, Switch Open

3, 2, 3.5, 2.5, 1.5 specifications

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