Service Manual

3 Troubleshooting (continued)

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

FAULT

DESCRIPTION

CORRECTIVE ACTION

 

 

 

 

The main control board has received a call

• The control board will release the call for heat after a

Anti-cycling

for heat too quickly after the previous call for

set time period.

heat has ended.

• The control board will release the call for heat if the

 

 

outlet temperature drops too quickly.

 

 

 

 

The unit has failed to prove main burner

• Inspect spark electrode and associated wiring for

 

ignition. It will require a manual reset before

damage and connection. Reference page 34 of this

 

attempting to fire again.

manual for removal and cleaning procedures.

 

 

Replace if necessary.

 

 

• Visually check for presence of a spark from the view

 

 

port.

 

 

• Check for proper electrical grounding of the unit.

 

 

• Check incoming supply gas pressure. Natural and

 

 

LP 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 gas valve 1 to the air

 

 

inlet is connected and is not damaged.

 

 

• Verify that the vent/air intake pipes are correctly

Flame Failure

 

installed and that there are no obstructions.

 

 

Ignition

 

• If 120 vac is present at the main control board, check

(will require a manual

 

 

the wiring between the main control board and the gas

reset once the condition

 

valve. Replace the wiring if necessary. Do not

has been corrected.

 

disconnect the wiring from the gas valve and attempt to

Press the RESET button

 

measure voltage at that point. The main control board

on the SMART TOUCH

 

can detect if the gas valve is not connected and will

display to reset.)

 

display the Gas Valve / Connection fault.

 

 

• If 120 vac is present, check the outlet of the valve to

 

 

ensure the valve is flowing gas. With a manometer

 

 

connected to the outlet tap of the gas valve, when the

 

 

unit is in the prepurge period, there should be a

 

 

negative pressure present. When the valve is

 

 

energized a change in pressure should occur. If the

 

 

pressure change does not occur, the gas valve is not

 

 

opening. Replace the gas valve.

 

 

• Inspect flame sensor and associated wiring.

 

 

Reference page 34 of this manual for removal and

 

 

cleaning procedures. Replace if necessary.

 

 

• Inspect the burner. Reference page 34 of this manual

 

 

for removal and cleaning procedures. Replace if

 

 

necessary.

 

 

 

41

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Lochinvar 3.5, 1.5, 2.5 service manual Anti-cycling, Flame Failure, Ignition
Page 40 Page 42

3, 2, 3.5, 2.5, 1.5 specifications

Lochinvar is a leader in manufacturing high-efficiency water heating solutions, and their Lochinvar 1.5, 1.3, and 1.0 models exemplify the company's commitment to innovation and performance. These advanced heating systems are designed to meet the diverse needs of commercial and residential applications, providing reliable hot water while ensuring energy efficiency and environmental sustainability.

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