Lochinvar 81-286 service manual Sensor Shorted, Louver Proving, Inlet Sensor, Fault, Outlet Sensor

Page 42

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.

 

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Contents Models 81 Contents Please read before proceeding Handling ceramic fiber materialsNiosh stated First Aid When servicing boiler Maintenance What is in this manual?Service TroubleshootingService Near boiler pipingKnight boiler 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 DisplayDescription See User Access Installer Access Display Modify Parameter tableMenu 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 VersionTemperature Settings Data LoggingFunctions DHW Settings Outdoor Reset Anti-Cycling Controlling Sensor Ramp SettingsControl modes BMS Thermostat InputCascade Offset Minimum On/Off TimeCirculation pumps Service Notification Maintenance Maintenance and annual startup Service technicianInstructions 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 Check flame signalOiled bearing circulators Cleaning boiler heat exchangerReview with owner Kit Part Component Number DescriptionCheck control module fuses TroubleshootingBefore troubleshooting Check the followingOperation No DisplayNo Burner Unit DoesChecking temperature sensors Temperature Resistance Temperature ResistanceResistance Temperature Boiler Pump System Pump NoisyNo Pump DHW PumpTroubleshooting Applies to the 286 Model Only Temp SwOpen Anti-cyclingCont’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 DiffFlue Temp High Delta T HighOutlet Temp Service Blk Rem Ctrl FltParameters Progr Combustion Analysis Procedure Or Obstruction Gas valve adjustment procedureGas Valve Adjustment Gas Supply Pressure
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81-286 specifications

Lochinvar 81-286 is a highly efficient and innovative heating solution that represents the latest advancements in boiler technology. This model, part of Lochinvar's prestigious line-up, is designed for commercial applications, delivering superior performance while emphasizing energy efficiency and user-friendly operation.

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