Service Manual

3 Troubleshooting

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

FAULT

DESCRIPTION

CORRECTIVE ACTION

 

 

 

Sensor Shorted

 

• Check the sensors and their associated wiring.

 

Repair or replace the sensor or wiring if damaged.

(will require a manual reset

Either the inlet water or outlet water

• Measure the resistance of the sensors and compare

once the condition has been

corrected. Press the RESET

temperature sensor has been shorted.

the resistance to the tables on page 35 of this

button on the SMART

 

manual.

 

SYSTEM display to reset.)

 

• Replace the sensor if necessary.

 

 

 

 

 

 

 

 

Louver Proving

 

 

 

Sw

 

• Check function of remote devices.

(will require a manual reset

An optional remote proving switch is not

 

 

once the condition has been

making.

• Check for loose or misplaced

jumper if auxiliary

corrected. Press the RESET

 

proving switch is not installed.

 

button on the SMART

 

 

 

 

 

SYSTEM display to reset.)

 

 

 

 

 

 

Inlet Sensor

 

• Check wiring to sensor. Make sure wiring is

 

connected and not damaged.

Reconnect / repair

Fault

 

wiring if necessary.

 

(will require a manual reset

The control reads the inlet sensor as open

• Measure the resistance of the sensor and compare to

once the condition has been

corrected. Press the RESET

or shorted.

the resistance in Table 3-2A on page 35 of this manual.

button on the SMART

 

Replace sensor if necessary.

 

SYSTEM display to reset.)

 

• Replace control module.

 

 

 

 

 

 

 

Outlet Sensor

 

• Check wiring to sensor. Make sure wiring is

 

connected and not damaged.

Reconnect / repair

Fault

 

wiring if necessary.

 

(will require a manual reset

The control reads the inlet sensor as open

• Measure the resistance of the sensor and compare to

once the condition has been

corrected. Press the RESET

or shorted.

the resistance in Table 3-2C on page 35 of this manual.

button on the SMART

 

Replace sensor if necessary.

 

SYSTEM display to reset.)

 

• Replace control module.

 

 

 

 

 

 

 

 

 

• Check wiring to sensor. Make sure wiring is

 

 

connected and not damaged. Reconnect / repair

Outlet 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

temperature difference between the two

the resistance in Table 3-2C on page 35 of this manual.

corrected. Press the RESET

sensors.

Replace sensor if necessary.

 

button on the SMART

 

• Restore control parameter defaults from optional PC

SYSTEM display to reset.)

 

 

 

software.

 

 

 

• Replace control module.

 

 

 

 

 

42

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Image 42
Lochinvar 400-801 service manual Sensor Shorted, Louver Proving, Inlet Sensor, Fault, Outlet Sensor, Outlet Temp Diff
Page 41 Page 43

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.

One of the standout features of the Lochinvar 400-801 is its high thermal efficiency, which can reach up to 99%. This efficiency not only reduces fuel consumption but also lowers operating costs, making it an economical choice for businesses seeking to minimize overhead. The boiler employs a stainless steel fire-tube heat exchanger that ensures optimal heat transfer and durability. This construction allows for enhanced resistance to corrosion, thereby extending the boiler's lifespan.

The Lochinvar 400-801 is equipped with advanced control technologies that enhance its performance. With its built-in SMART SYSTEM control, users can easily monitor and manage the boiler’s operations, optimizing performance while ensuring ease of use. This control system features a user-friendly interface that provides real-time data, including temperature settings, pressure readings, and operational status, allowing for quick diagnostics and efficient troubleshooting.

Safety is paramount in the design of the Lochinvar 400-801. The boiler includes a comprehensive safety system that incorporates multiple safety interlocks and a venting system that prevents backflow and ensures safe exhaust. Moreover, the unit is designed to operate with minimal noise, making it suitable for environments where noise reduction is crucial.

Installation and maintenance of the Lochinvar 400-801 are straightforward, thanks to its compact design and multiple venting options. The low-profile construction allows for flexibility in placement, making it an ideal fit for tight spaces. Maintenance tasks are simplified with accessible components, minimizing downtime and ensuring the system operates efficiently over its lifespan.

In conclusion, the Lochinvar 400-801 stands out in the commercial boiler market with its blend of efficiency, reliability, and innovation. With its advanced technologies and features, businesses can achieve significant energy savings while ensuring comfortable and consistent heat for various applications. The Lochinvar 400-801 is an investment in quality and performance, backed by a well-established brand in the heating industry. Whether for a new installation or a replacement, this boiler offers a comprehensive solution for commercial heating needs.
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