Service Manual

3 Troubleshooting (continued)

Table 3-4(continued from previous page) Troubleshooting Chart - Fault Messages Displayed on Boiler Interface

FAULT

DESCRIPTION

CORRECTIVE ACTION

 

 

 

 

The unit has failed to prove main burner

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

 

ignition after four (4) attempts.

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.

 

 

• If 24 vac is present at the main control board, check

 

 

the wiring between the main control board and the gas

 

 

valve. Replace the wiring if necessary. Do not

 

 

disconnect the wiring from the gas valve and attempt to

Flame Fail Ign

 

measure voltage at that point. The main control board

 

can detect if the gas valve is not connected and will

(cont’d)

 

display the Gas Valve or Gas Valve Fail fault.

(will require a manual

 

• If 24 vac is present, check the outlet of the valve to

reset once the condition

 

ensure the valve is flowing gas. With a manometer

has been corrected.

 

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

Press the RESET button

 

unit is in the prepurge period, there should be a

on the SMART SYSTEM

 

negative pressure present. When the valve is

display to reset.)

 

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 31 of this manual for removal and

 

 

cleaning procedures. Replace if necessary.

 

 

• Inspect and clean the heat exchanger as necessary.

 

 

Reference page 32 of this manual for cleaning

 

 

procedures.

 

 

• Inspect the burner. Reference page 31 of this manual

 

 

for removal and cleaning procedures. Replace if

 

 

necessary.

 

 

• Replace the main control board.

 

 

 

Flame Sequence

 

• Check supply voltage for proper polarity.

(will require a manual

 

• Check external wiring for voltage feedback.

reset once the condition

The flame detector circuit is seeing a flame

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

has been corrected.

signal while no flame is present.

Press the RESET button

• Check the internal wiring for bad connections.

on the SMART SYSTEM

 

 

• Replace main control board.

display to reset.)

 

 

 

 

39

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Image 39
Lochinvar 400, 801 service manual Cont’d, Flame Sequence
Page 38 Page 40

400, 801 specifications

The Lochinvar 801,400 is a cutting-edge solution in the realm of high-efficiency commercial water heating. This model represents a significant advancement in the design and functionality of water heaters, catering primarily to the demands of large-scale facilities like hotels, hospitals, and large industrial operations.

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In summary, the Lochinvar 801,400 offers a combination of high capacity, advanced technology, durability, and energy efficiency, making it an excellent choice for commercial water heating solutions. As industries continue to evolve, the demand for reliable and efficient water heating solutions like the Lochinvar 801,400 will only increase.
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