Lochinvar 801, 400 No Display, No Burner, Operation, Unit Does, Not Modulate, Above 50%

Page 34

Service Manual

3 Troubleshooting

Table 3-1Troubleshooting Chart - No Display

FAULT

CAUSE

 

CORRECTIVE ACTION

 

 

 

 

 

 

 

- No 120 vac supplied to unit.

Check external line switch, fuse, or breaker.

 

 

Check position of ON/OFF switch. Turn switch to the

 

 

 

 

 

ON position.

 

 

 

 

 

 

 

 

 

• Check 120 vac through the ON/OFF switch.

 

 

 

• Check wiring

harness connection

between

display

 

 

 

board

and

main

control

board.

Connect

No Display

 

 

harness at both points.

 

 

 

 

 

- No voltage through the switch.

Replace switch.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

- Bad display board.

Replace board.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

- Bad main control board.

Replace the main control board.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

- Blown fuse.

Replace

fuse

F3 on

the main

control

board, see

 

 

page 33 of this manual.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

- Main control board temperature set point

Review temperature setting.

 

 

 

 

 

 

satisfied.

 

 

 

 

 

 

 

 

 

 

 

- Remote thermostat satisfied.

Review remote thermostat setting.

 

 

 

 

 

 

 

 

 

 

 

 

No Burner

- Outside air temperature above Warm

Check

location of

outside

air

sensor.

Check

Weather Shutdown (WWSD) set point for

 

resistance of outdoor air sensor and compare to Table

Operation

main control board.

 

3-2B on page 35 of this manual.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Consult

display for

specific

fault.

Refer

to fault

 

- Unit locked out on fault.

 

descriptions on page 37 of this manual for corrective

 

 

 

actions.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

- Unit in Shutdown Mode.

• Take unit out of Shutdown Mode.

 

 

 

 

 

 

 

 

 

 

Check ramp delay parameter settings. Optional PC

 

- Ramp delay active.

 

software required.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Turn ramp delay feature off.

See page 23 of this

 

 

Unit Does

 

 

manual for instructions on how to turn this feature off.

 

 

 

 

 

 

 

 

 

 

 

 

• Check BMS parameter settings. Optional PC

Not Modulate

- Boiler controlled by BMS.

 

software required.

 

 

 

 

 

 

Above 50%

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Verify that the flue sensor is located in the flue outlet.

 

 

 

 

 

 

 

 

- Flue sensor open.

Check wiring connections at the flue sensor.

 

 

 

 

 

 

 

 

 

 

 

 

 

Check the resistance of the flue sensor and compare

 

 

 

 

 

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

 

 

 

 

 

 

 

 

 

 

 

 

 

 

34

Image 34
Contents Models 400 Contents Handling ceramic fiber materials Please read before proceedingNiosh stated First Aid When servicing boiler Maintenance What is in this manual?Service TroubleshootingService Near boiler pipingKnight XL display Navigation DialControl inputs LOW Voltage Connection BoardSmart Control Module Control outputsHow the boiler operates Access modesGeneral Operation How the control module operatesOperation Display From previous page Sequence of Operation Display panel menu access Button Screen Operation Display StatusDisplay panel parameter access Button Screen Status Operation DisplayParameter table Description See User Access Installer Access Display ModifyMenu DHW Settings Resetoutdoor See User Access Installer Access Display Modify DescriptionBMS Service Notification Time and Date Temperature units C / FViewable and changeable control parameters Software VersionData Logging Temperature SettingsFunctions DHW Settings Outdoor Reset Anti-Cycling Controlling Sensor Ramp SettingsControl modes BMS Thermostat InputCascade Offset Minimum On/Off TimeCirculation pumps Service Notification Service technician Maintenance Maintenance and annual startupOwner maintenance Maintenance Check expansion tank Flue vent system and air pipingCheck water system Check boiler relief valveCheck control settings Check ignition ground wiringCheck all boiler wiring Inspect ignition and flame sense electrodesReview with owner Check flame signalCleaning boiler heat exchanger Model Kit Part Component Number DescriptionCheck control module fuses TroubleshootingBefore troubleshooting Check the followingOperation No DisplayNo Burner Unit DoesWire Color R/BK and Y Wire Color G and Y Checking temperature sensorsTemperature Resistance Temperature Resistance Resistance TemperatureBoiler Pump NoisyNo Pump System PumpTroubleshooting Anti-cycling Temp SwOpen Flame Fail IgnCont’d Flame SequenceOutlet Arhl Outlet MrhlHigh Fan Low/HighFan Speed Low GV/RelayLouver Proving FaultSensor Shorted Inlet SensorMemory Error Flue Sensor FaultFatal Error Flue Temp DiffDelta T High Flue Temp HighOutlet Temp No Error Stored Service BlkWatch Dog Error Rem Ctrl FltCombustion Analysis Procedure Model Gas valve adjustment procedureModels 601
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400, 801 specifications

The Lochinvar 801,400 is a cutting-edge solution in the realm of high-efficiency commercial water heating. This model represents a significant advancement in the design and functionality of water heaters, catering primarily to the demands of large-scale facilities like hotels, hospitals, and large industrial operations.

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