Lochinvar Troubleshooting Flue Sensor Faults and Error Codes for Boilers
Page 43

Service Manual

3 Troubleshooting (continued)

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

FAULT

DESCRIPTION

 

 

CORRECTIVE ACTION

 

 

 

 

 

 

• Check

wiring to sensor. Make sure wiring is

Flue Sensor Fault

 

 

connected and not damaged.

Reconnect / repair

 

 

wiring if necessary.

 

(will require a manual reset

 

 

 

The control reads the flue sensor as open

 

 

 

 

once the condition has been

• Measure the resistance of the sensor and compare

corrected. Press the RESET

or shorted.

 

to the resistance in Table 3-2D on page 35 of this

button on the SMART

 

 

 

 

manual. Replace the sensor if necessary.

SYSTEM display to reset.)

 

 

 

 

 

 

 

 

 

•

Replace control module.

 

 

 

 

 

 

 

• Check

wiring to sensor. Make sure wiring is

 

 

 

connected and not damaged. Reconnect / repair

Flue 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

 

the resistance in Table 3-2D on page 35 of this

corrected. Press the RESET

temperature difference between the two

 

manual. Replace sensor if necessary.

button on the SMART

sensors.

 

 

 

 

 

•

Restore control parameter defaults from optional PC

SYSTEM display to reset.)

 

 

 

 

software.

 

 

 

•

Replace control module.

 

 

 

 

 

 

• Inspect the heat exchanger. Reference page 32 of

 

 

 

this manual for the procedure on how to clean the flue

 

 

 

side of the heat exchanger.

 

Flue Temp Limit

 

• Inspect

the flue sensor and

associated wiring.

(will require a manual reset

 

The stack temperature has exceeded the

 

Measure the resistance of the flue sensor and

once the condition has been

 

 

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

corrected. Press the RESET Flue Temp Limit set parameters.

 

 

Replace the sensor if necessary.

 

button on the SMART

 

 

 

 

 

 

 

 

SYSTEM display to reset.)

 

• Verify that the vent/air intake

pipes are properly

 

 

 

 

 

installed and that there are no obstructions.

 

 

• Replace the main control board.

 

 

 

• Restore the parameter defaults from the optional PC

Fatal Error

The control module has detected parameter

software.

settings that are out of range.

 

 

• Replace control module.

 

 

Memory Error

A lockout occurs at the same time as a power outage.

• Reset control module.

43

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Contents Models 400 Contents Handling ceramic fiber materials Please read before proceedingNiosh stated First Aid When servicing boiler Troubleshooting What is in this manual?Service MaintenanceNear boiler piping ServiceNavigation Dial Knight XL displayLOW Voltage Connection Board Control inputsControl outputs Smart Control ModuleHow the control module operates Access modesGeneral Operation How the boiler operatesOperation Display From previous page Sequence of Operation Button Screen Operation Display Status Display panel menu accessButton Screen Status Operation Display Display panel parameter accessParameter table Description See User Access Installer Access Display ModifyMenu DHW Settings Resetoutdoor Description See User Access Installer Access Display ModifyBMS Service Notification Software Version Temperature units C / FViewable and changeable control parameters Time and DateData Logging Temperature SettingsFunctions DHW Settings Outdoor Reset Anti-Cycling BMS Thermostat Input Ramp SettingsControl modes Controlling SensorMinimum On/Off Time Cascade OffsetCirculation pumps Service Notification Service technician Maintenance Maintenance and annual startupOwner maintenance Maintenance Check boiler relief valve Flue vent system and air pipingCheck water system Check expansion tankInspect ignition and flame sense electrodes Check ignition ground wiringCheck all boiler wiring Check control settingsModel Kit Part Component Number Description Check flame signalCleaning boiler heat exchanger Review with ownerCheck the following TroubleshootingBefore troubleshooting Check control module fusesUnit Does No DisplayNo Burner OperationResistance Temperature Checking temperature sensorsTemperature Resistance Temperature Resistance Wire Color R/BK and Y Wire Color G and YSystem Pump NoisyNo Pump Boiler PumpTroubleshooting Flame Fail Ign Temp SwOpen Anti-cyclingFlame Sequence Cont’dOutlet Mrhl Outlet ArhlGV/Relay Fan Low/HighFan Speed Low HighInlet Sensor FaultSensor Shorted Louver ProvingFlue Temp Diff Flue Sensor FaultFatal Error Memory ErrorDelta T High Flue Temp HighOutlet Temp Rem Ctrl Flt Service BlkWatch Dog Error No Error StoredCombustion Analysis Procedure Model Gas valve adjustment procedureModels 601
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