Service Manual

3 Troubleshooting (continued)

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

FAULT

DESCRIPTION

CORRECTIVE ACTION

 

 

 

 

 

 

 

 

 

 

• Check boiler pump operation on a call for heat.

 

Flow Switch/

 

• Check for closed valves or obstructions in the boiler

 

LWCO

Either the low water cutoff or the optional

piping.

 

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

 

(will require a manual

flow switch is not making.

 

reset once condition has

 

purged from the system.

 

been corrected. Press

 

• Check for loose or misplaced jumpers if flow switch is

 

the RESET button on

 

not installed.

 

the display to reset.)

 

 

 

 

 

 

 

Blown fuse.

• Replace fuse F2 on the control board, see page 43 of

 

 

this manual.

 

 

 

 

Condensate

 

• Check condensate tube from unit to floor drain for

 

 

proper installation and obstructions.

 

Drain Blocked

 

 

The blocked drain switch has detected

• Inspect condensate trap for blockage. Clean if

 

(will require a manual

 

reset once condition has

excessive condensate build up inside the

necessary.

 

been corrected. Press

unit.

• Check for loose wiring connection at wire harness

 

the RESET button on

 

plug.

 

the display to reset.)

 

• Bad blocked drain switch. Replace switch.

 

 

 

 

 

 

 

 

 

 

 

Flame out of

 

• Check supply voltage for proper polarity.

 

Sequence

 

• Check external wiring for voltage feedback.

 

(will require a manual

The flame detector circuit is seeing a flame

 

• Check the flame rod and make sure it is clean.

 

reset once the condition

signal while no flame is present.

 

has been corrected.

 

• Check the internal wiring for bad connections.

 

Press the RESET button

 

• Replace main control board.

 

on the display to reset.)

 

 

 

 

 

 

 

 

 

Gas Valve /

 

• Check wiring harness connection at the gas valve and

 

Connection

 

 

 

at the main control board.

 

(will require a manual

The main control board did not detect the

 

• Replace the gas valve wire harness.

 

reset once the condition

gas valve.

 

• Replace the gas valve.

 

has been corrected.

 

 

Press the RESET button

 

• Replace the main control board.

 

on the display to reset.)

 

 

 

 

 

 

 

 

 

 

• Inspect spark electrode and associated wiring for

 

 

 

damage and connection. Reference page 39 of this

 

 

 

manual for removal and cleaning procedures.

 

 

 

Replace if necessary.

 

 

 

• Check for proper electrical grounding of the unit.

 

 

 

• Check incoming supply gas pressure. Natural gas

 

Burner Did Not

 

pressures should be between 4 - 14 inches w.c.

 

 

(1.0 - 3.5 kPa) and LP gas pressures should be

 

Light

 

between 8 - 14 inches w.c. (2.0 - 3.2 kPa). Refer

 

(will require a manual

The unit has failed to prove main burner

to Section 6 - Gas Connections of the SYNC

 

reset once the condition

ignition after one attempt. It will require a

Installation and Operation Manual for detailed

 

has been corrected.

manual reset before attempting to fire again.

information concerning the gas supply.

 

Press the RESET button

 

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

 

on the display to reset.)

 

air inlet is connected and is not damaged.

 

 

 

• Verify that the vent/air intake pipes are correctly

 

 

 

installed and that there are no obstructions.

 

 

 

• Check for 24 VAC to the gas valve at the 2-pin

 

 

 

connection on the side of the main control board

 

 

 

during the ignition attempt. If no voltage is present,

 

 

 

replace the main control board.

 

 

 

 

 

47

 

 

 

 

 

 

 

 

 

 

 

 

Page 46 Page 48
Page 47
Image 47
Lochinvar 1.3 Flow Switch, Condensate, Drain Blocked, Flame out, Gas Valve, Connection, Burner Did Not, Light
Page 46 Page 48

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