Service Manual

3Troubleshooting

Table 3F Troubleshooting Chart - Fault Messages Displayed on Boiler Interface

FAULT

DESCRIPTION

CORRECTIVE ACTION

 

 

 

 

 

 

Either the optional manual reset low gas

• Reset the pressure switches.

 

 

 

 

 

pressure switch or the optional manual reset

 

 

 

high gas pressure switch tripped (not

• Measure the supply gas pressure to determine cause

Gas Pressure SW

available on 399 models).

of failure. Natural gas pressures should be between

 

4 - 14 inches w.c. (1.0 - 3.5 kPa) and LP gas

(will require a manual

 

pressures should be between 8 - 14 inches w.c.

reset once the condition

 

(2.0 - 3.2 kPa).

 

has been corrected.

 

• Refer to Section 7 - Gas Connections of the Knight

Press the RESET button

 

on the SMART SYSTEM

 

XL Installation and Operation Manual for

detailed

 

information concerning the gas supply.

 

display to reset.)

 

 

 

 

 

 

 

• Correct the supply gas pressure if necessary.

 

 

• Check for a loose or misplaced jumper if pressure

 

 

switches are not installed.

 

 

 

 

 

Either the flow switch or the optional low

• Check boiler pump operation on a call for heat.

Flow

water cutoff is not making.

 

 

 

• Check for closed valves or obstructions in the boiler

Switch/LWCO

 

piping.

 

 

 

 

(will require a manual

 

• Verify system is full of water and all air has been

reset once condition has

 

 

purged from the system.

 

been corrected. Press

 

 

 

 

 

the RESET button on

 

• Check for loose or misplaced jumpers if flow switch or

the SMART SYSTEM

 

LWCO is not installed.

 

display to reset.)

 

 

 

Blown fuse.

• Replace fuse F2 on the control board, see page 28 of

 

 

this manual.

 

 

 

 

 

 

 

Blocked Drain SW

The blocked drain switch has detected

• Check condensate tube from unit to floor drain for

excessive condensate build up inside the

proper installation and obstructions.

 

(will require a manual

unit.

• Inspect condensate trap for blockage.

Clean if

reset once condition has

 

been corrected. Press

 

necessary.

 

the RESET button on

 

• Check for loose wiring connection at wire

harness

the SMART SYSTEM

 

 

plug.

 

display to reset.)

 

 

 

 

 

 

 

• Bad blocked drain switch. Replace switch.

 

Flame

The flame detector circuit is seeing a flame

• Check supply voltage for proper polarity.

 

Sequence

signal while no flame is present.

 

 

 

• Check external wiring for voltage feedback.

 

(will require a manual

 

 

reset once the condition

 

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

has been corrected.

 

 

 

 

Press the RESET button

 

• Check the internal wiring for bad connections.

on the SMART SYSTEM

 

 

 

 

display to reset.)

 

• Replace main control board.

 

GV/Relay

The main control board did not detect the gas

• Check wiring harness connection at the gas valve and

Fail

valve.

at the main control board.

 

(will require a manual

 

 

 

reset once the condition

 

• Replace the gas valve wire harness.

 

has been corrected.

 

 

 

Press the RESET button

 

• Replace the gas valve.

 

on the SMART SYSTEM

 

 

 

display to reset.)

 

• Replace the main control board.

 

 

 

 

 

32

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Lochinvar 399 - 800 service manual Flow, Switch/LWCO, Flame, Sequence, GV/Relay, Fail

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.