Lochinvar 400-801 service manual Fan Low/High, Fan Speed Low, GV/Relay, Fail, Sensor Open

Page 41

Service Manual

3 Troubleshooting (continued)

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

FAULT

DESCRIPTION

CORRECTIVE ACTION

 

 

 

 

 

• Replace the main control board if necessary.

 

 

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

 

 

pump is not operating, replace the pump.

Outlet MRHL

 

• If the system pump is a variable speed pump, ensure

(cont’d)

 

that the system flow is not less than the boiler flow.

(will require a manual

The outlet water temperature has exceeded

• If operating on something other than an outlet sensor,

reset once the condition

has been corrected. Press

the setting of the manual reset high limit.

check temperature setting of the main control board.

• If the optional manual reset high limit has tripped,

the RESET button on the

 

SMART SYSTEM display

 

check setting of the device.

to reset.)

 

• Check resistance of water sensors and compare to

 

 

Table 3-2A on page 35 of this manual. Replace

 

 

sensor if necessary.

 

 

• Replace high limit.

 

 

 

 

 

• Vent/air intake lengths exceed the maximum allowed

 

 

lengths. Refer to Section 3 - General Venting of the

Fan Low/High

 

Knight XL Installation and Operation Manual for

 

proper lengths.

OR

 

• Check for obstruction or blockage in the vent/air

Fan Speed Low/

The actual fan RPM is 30% lower than what

High

is being called for.

intake pipes or at terminations.

• Check the wiring connections at the fan and at the

(will require a manual

 

reset once the condition

 

main control board.

has been corrected. Press

 

• Replace the fan.

the RESET button on the

 

 

• Replace the main control board.

SMART SYSTEM display

 

to reset.)

 

 

Blown fuse.

• Replace fuse F2 on the control board, see page 33

 

 

of this manual.

 

 

 

 

 

GV/Relay

 

• Check wiring harness connection at the gas valve and

 

at the main control board.

Fail

 

 

 

(will require a manual

The main control board did not detect the

• Replace the gas valve wire harness.

reset once the condition

 

has been corrected. Press

gas valve.

• Replace the gas valve.

the RESET button on the

 

 

 

SMART SYSTEM display

 

• Replace the main control board.

to reset.)

 

 

 

 

 

Sensor Open

 

• Check the sensors and their associated wiring.

(will require a manual

 

Repair or replace the sensor or wiring if damaged.

 

 

reset once the condition

Either the inlet water or outlet water

• Measure the resistance of the sensors and compare

has been corrected. Press

the RESET button on the

temperature sensor has been disconnected.

the resistance to the tables on page 35 of this

SMART SYSTEM display

 

manual.

 

 

to reset.)

 

• Replace the sensor if necessary.

 

 

 

 

 

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Contents Models 400 Contents Niosh stated First Aid Please read before proceedingHandling ceramic fiber materials When servicing boiler Service What is in this manual?Maintenance TroubleshootingNear boiler piping ServiceNavigation Dial Knight XL displayLOW Voltage Connection Board Control inputsControl outputs Smart Control ModuleGeneral Operation Access modesHow the boiler operates How the control module operatesOperation Display From previous page Sequence of Operation Button Screen Operation Display Status Display panel menu accessButton Screen Status Operation Display Display panel parameter accessMenu Description See User Access Installer Access Display ModifyParameter table Resetoutdoor ANTI-CYCLING Description See User Access Installer Access Display ModifyViewable and changeable control parameters Temperature units C / FTime and Date Software VersionFunctions Temperature SettingsData Logging DHW Settings Outdoor Reset Anti-Cycling Control modes Circulation pumps Cascade OffsetMinimum On/Off Time DHW Pump Delay Boiler Pump DelayBoiler Pump Anti-Seize Delay DHW Pump Anti-Seize DelayService Notification Owner maintenance Maintenance Maintenance and annual startupService technician Maintenance Check expansion tank Check boiler relief valve Flue vent system and air pipingCheck water system Check all boiler wiring Check ignition ground wiringCheck control settings Inspect ignition and flame sense electrodesCleaning boiler heat exchanger Check flame signalReview with owner Model Kit Part Component Number DescriptionTest low water flow conditions Test procedureBefore troubleshooting TroubleshootingCheck the following Check control module fusesNo Burner No DisplayOperation Unit DoesTemperature Resistance Temperature Resistance Checking temperature sensorsWire Color R/BK and Y Wire Color G and Y Resistance TemperatureNo Pump NoisyBoiler Pump System PumpTroubleshooting Open Temp SwAnti-cycling Flame Fail IgnFlame Sequence Cont’dOutlet Mrhl Outlet ArhlFan Speed Low Fan Low/HighHigh GV/RelaySensor Shorted FaultLouver Proving Inlet SensorFatal Error Flue Sensor FaultMemory Error Flue Temp DiffOutlet Temp Flue Temp HighDelta T High Watch Dog Error Service BlkNo Error Stored Rem Ctrl FltCombustion Analysis Procedure Models 601 Gas valve adjustment procedureModel
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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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