Service Manual

3 Troubleshooting

Table 3G Troubleshooting Chart - Fault Messages Displayed on Boiler Interface

FAULT

DESCRIPTION

CORRECTIVE ACTION

 

 

 

 

 

Gas Pressure SW

 

• Measure the supply gas pressure to determine cause

Open

 

of failure. Natural and LP gas pressures should be

(will require a manual

Either the low gas pressure switch or one of

between 4 - 14 inches w.c. (1.0 - 3.5 kPa).

 

 

reset once the condition

• Refer

to Section 6 - Gas Connections of

the

has been corrected. Press

the high gas pressure switches tripped.

Crest Installation and Operation Manual for detailed

the RESET button on the

 

 

information concerning the gas supply.

 

 

 

SMART TOUCH display

 

 

 

 

 

• Correct the supply gas pressure if necessary.

 

to reset.)

 

 

 

 

 

 

 

• Reset the LWCO from the RESET button on the front

Low Water

 

control panel.

 

 

 

 

 

 

 

 

 

 

 

 

 

Cutoff Open

The low water cutoff is not making.

• Verify system is full of water and all air has been

(will require a manual

purged from the system.

 

 

 

 

 

 

 

 

 

reset once condition has

 

• Check for loose or misplaced jumpers if flow switch or

been corrected. Press

 

 

LWCO is not installed.

 

 

 

 

the RESET button on the

 

 

 

 

 

 

 

 

 

 

 

 

 

SMART TOUCH display

 

 

 

 

 

 

 

 

 

• Replace fuse F2 on the control board, see page 38

to reset.)

Blown fuse.

 

of this manual.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Blocked Drain SW

 

• Check condensate tube from unit to floor drain for

Open

 

proper installation and obstructions.

 

 

 

(will require a manual

The blocked drain switch has detected

• Inspect

condensate

trap

for blockage.

Clean if

reset once condition has

necessary.

 

 

 

 

 

been corrected. Press

excessive condensate build up inside the

• Check for loose wiring connection at wire harness

the RESET button on the

unit.

SMART TOUCH display

 

plug.

 

 

 

 

 

 

to reset.)

 

• Bad blocked drain switch. Replace switch.

 

 

 

 

 

 

 

• Check the wiring connections to switch. Wires should

 

 

be connected to the common and normally closed

 

 

terminals.

 

 

 

 

 

 

 

• Vent/air intake lengths exceed the maximum allowed

 

 

lengths. Refer to Section 2 - General Venting of the

 

 

Crest

Installation

and

Operation

Manual

for

APS

 

proper lengths.

 

 

 

 

 

 

• Check

for obstruction or

blockage in

the

vent/air

Open

 

 

intake pipes or at terminations.

 

 

 

(will require a manual

 

 

 

 

Blocked flue/inlet pressure switch contacts

• Check reference hose and tubing connected to the

reset once the condition

has been corrected. Press

are open.

pressure switch for blockage or obstruction.

 

 

the RESET button on the

 

• Inspect the burner. Reference page 34 of this manual

SMART TOUCH display

 

for removal and cleaning

procedures.

Replace if

to reset.)

 

necessary.

 

 

 

 

 

 

 

• Inspect the heat exchanger. Reference page 35 of

 

 

this manual for removal and cleaning procedures.

 

 

Replace if necessary.

 

 

 

 

 

 

 

• Faulty air pressure switch. Replace switch.

 

 

 

 

• Verify combustion air blower is operating. Replace if

 

 

necessary.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

40

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Lochinvar 1.5, 3.5, 2.5 service manual Low Water, Cutoff Open

3, 2, 3.5, 2.5, 1.5 specifications

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