Service Manual

3Troubleshooting (continued)

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

FAULT

DESCRIPTION

CORRECTIVE ACTION

 

 

 

 

While the unit is in Service Mode, the outlet

• Establish a heating load to remove the heat from the

 

temperature has exceeded 185°F.

boiler loop.

 

 

 

 

 

 

• Verify that the system is full of water and that all air

 

 

has been properly purged from the system.

 

 

• Verify that the boiler is piped properly into the heating

 

 

system. Refer to Section 6 - Hydronic Piping of the

 

 

Knight XL Installation and Operation Manual for the

 

 

proper piping methods for the Knight

XL boiler.

Service Blk

 

• Check voltage to the boiler pump motor on a call for

 

 

 

 

heat. If voltage is not present, check the wiring back

 

 

to the pump relay. Replace the pump relay if

 

 

necessary.

 

 

 

 

 

 

• If 120 VAC is present on a call for heat and the boiler

 

 

pump is not operating, replace the pump.

 

 

• Verify that the boiler pump is set to the proper speed

 

 

or that the boiler pump is the proper size. Reference

 

 

Section 6 - Hydronic Piping

of the Knight

 

 

XL Installation and Operation Manual for boiler

 

 

pump specifications.

 

 

 

 

 

 

 

 

120 VAC input to the main control board has

• Check 120 VAC supply to the transformer.

 

dropped below 80 VAC.

 

 

 

 

 

Low 24 VAC

 

• Check wiring connections at the low voltage terminal

 

strip.

 

 

 

 

 

 

• Check the wire size/length to remote devices.

 

 

• Replace the transformer.

 

 

 

 

Watch Dog Error

The main control board has detected an

• Replace the main control board.

 

 

 

 

internal fault.

 

 

 

 

 

 

 

 

 

 

 

 

Write EEProm

The main control board has detected an

• Replace the main control board.

 

 

 

 

internal fault.

 

 

 

 

 

 

 

 

 

 

 

 

 

The main control board has detected an

• Replace the main control board.

 

 

 

 

CRC Parameters

internal fault.

 

 

 

 

 

 

 

 

 

The main control board has detected an

• Press the ENTER/RESET button on the SMART

No Error Stored

internal fault.

SYSTEM display panel.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

39

 

 

 

 

 

 

 

 

 

 

 

Page 39
Image 39
Lochinvar 399 - 800 service manual Service Blk, Low 24 VAC, Watch Dog Error, Write EEProm, CRC Parameters, No Error Stored

399 - 800 specifications

Lochinvar is known for its cutting-edge water heating and boiler systems, and the Lochinvar 399 - 800 series is no exception. Specifically designed for commercial applications, this series brings advanced technology and engineering to the forefront of hydronic heating solutions.

One of the standout features of the Lochinvar 399 - 800 series is its impressive efficiency. Equipped with a condensing design, these boilers utilize high-efficiency stainless steel heat exchangers that allow for maximum heat transfer while minimizing energy consumption. With an impressive thermal efficiency of up to 96%, the Lochinvar 399 - 800 series stands out in its class, offering significant energy savings and reduced operational costs over time.

Another key characteristic of this series is its robust construction. Designed with longevity in mind, the boilers are built using high-quality materials that withstand extreme temperatures and pressures. The stainless steel design not only enhances durability but also combats corrosion, ensuring a long service life and reduced maintenance costs for users.

The Lochinvar 399 - 800 series also incorporates advanced control technologies. With its intuitive control system, users can easily adjust and monitor heating parameters, ensuring optimal performance and comfort. The integrated Control Wizard feature simplifies the setup process, allowing for quick commissioning and troubleshooting. Additionally, the optional Lochinvar SMART CONTROL technology provides remote monitoring capabilities, allowing operators to keep track of system performance from anywhere.

Versatility is another hallmark of the Lochinvar 399 - 800 series. These boilers come in a range of sizes, with the ability to modulate output based on real-time heating demands. This flexibility ensures that systems can operate efficiently under varying load conditions, making them ideal for schools, hospitals, and commercial buildings requiring consistent hot water availability.

In summary, the Lochinvar 399 - 800 series exemplifies modern boiler technology, combining energy efficiency, durability, advanced controls, and versatility. As businesses and facilities seek to enhance their heating systems, the Lochinvar 399 - 800 offers a reliable and forward-thinking solution for today's energy-conscious environment. Investing in this state-of-the-art boiler system not only improves comfort but also fosters sustainability and cost-effectiveness in commercial heating applications.