Service Manual

3 Troubleshooting (continued)

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

FAULT

DESCRIPTION

 

 

CORRECTIVE ACTION

 

 

 

 

 

 

• Check

wiring to sensor. Make sure wiring is

Flue Sensor Fault

 

 

connected and not damaged.

Reconnect / repair

 

 

wiring if necessary.

 

(will require a manual reset

 

 

 

The control reads the flue sensor as open

 

 

 

 

once the condition has been

• Measure the resistance of the sensor and compare

corrected. Press the RESET

or shorted.

 

to the resistance in Table 3-2D on page 35 of this

button on the SMART

 

 

 

 

manual. Replace the sensor if necessary.

SYSTEM display to reset.)

 

 

 

 

 

 

 

 

 

Replace control module.

 

 

 

 

 

 

 

• Check

wiring to sensor. Make sure wiring is

 

 

 

connected and not damaged. Reconnect / repair

Flue Temp Diff

 

 

wiring if necessary.

 

 

• Measure the resistance of the sensor and compare to

(will require a manual reset

The control module reads an excessive

once the condition has been

 

the resistance in Table 3-2D on page 35 of this

corrected. Press the RESET

temperature difference between the two

 

manual. Replace sensor if necessary.

button on the SMART

sensors.

 

 

 

 

 

Restore control parameter defaults from optional PC

SYSTEM display to reset.)

 

 

 

 

software.

 

 

 

Replace control module.

 

 

 

 

 

 

• Inspect the heat exchanger. Reference page 32 of

 

 

 

this manual for the procedure on how to clean the flue

 

 

 

side of the heat exchanger.

 

Flue Temp Limit

 

• Inspect

the flue sensor and

associated wiring.

(will require a manual reset

 

The stack temperature has exceeded the

 

Measure the resistance of the flue sensor and

once the condition has been

 

 

compare to Table 3-2D on page 35 of this manual.

corrected. Press the RESET Flue Temp Limit set parameters.

 

 

Replace the sensor if necessary.

 

button on the SMART

 

 

 

 

 

 

 

 

SYSTEM display to reset.)

 

• Verify that the vent/air intake

pipes are properly

 

 

 

 

 

installed and that there are no obstructions.

 

 

• Replace the main control board.

 

 

 

• Restore the parameter defaults from the optional PC

Fatal Error

The control module has detected parameter

software.

settings that are out of range.

 

 

• Replace control module.

 

 

Memory Error

A lockout occurs at the same time as a power outage.

• Reset control module.

43

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Lochinvar 400-801 service manual Flue Sensor Fault, Flue Temp Diff, Flue Temp Limit, Fatal Error, Memory Error

400-801 specifications

The Lochinvar 400-801 is a high-efficiency commercial boiler that embodies advanced engineering and cutting-edge technology. Designed for a variety of commercial applications, this boiler is known for its reliability, efficiency, and robust performance.

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