Lochinvar Troubleshooting Air Switch Open and Heat Exchanger Issues in Knight Boiler Manual

Page 38

Service Manual

3 Troubleshooting

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

FAULT

DESCRIPTION

CORRECTIVE ACTION

 

 

 

 

 

 

 

 

 

APS:

 

 

 

 

 

• Check the wiring connections to switch. Wires should

 

 

be connected to the common and normally closed

 

 

terminals.

 

 

 

 

 

• Air intake lengths exceed the maximum allowed

 

 

lengths. Refer to Section 3 - General Venting of the

 

 

Knight XL Installation and Operation Manual for

 

 

proper lengths.

 

 

 

 

 

• Check for obstruction or blockage

in the

air

APS / HEX

 

intake pipes or at terminations.

 

 

 

• Check reference hoses connected to the air pressure

Temp Sw

 

switch for blockage or obstruction.

 

 

Open

Either the air pressure switch contacts are

• Inspect the burner. Reference page 31 of this manual

(will require a manual

reset once the condition

open, or the O-temp heat exchanger switch

for removal and cleaning procedures.

Replace if

necessary.

 

 

 

has been corrected.

has opened.

 

 

 

• Inspect the heat exchanger.

Reference page 32 of

Press the RESET button

 

 

this manual for removal and cleaning procedures.

on the SMART SYSTEM

 

 

Replace if necessary.

 

 

 

display to reset.)

 

• Faulty air pressure switch. Replace switch.

 

 

 

 

 

 

 

 

 

 

 

O-TEMP HEX SWITCH

 

 

 

 

• Inspect the back of the inner combustion chamber at

 

 

burner level for refractory breakdown / missing.

 

 

Replace heat exchanger if refractory is broken and unit

 

 

has fired.

 

 

 

 

 

• Check continuity across two contacts. Wires should be

 

 

connected at both poles of the normally closed switch.

 

 

• Faulty O-Temp HEX Switch. Replace switch.

 

 

 

 

 

The main control board has received a call

• The control board will release the call for heat after a

Anti-cycling

for heat too quickly after the previous call for

set time period.

 

 

 

heat has ended.

• The control board will release the call for heat if the

 

 

outlet temperature drops too quickly.

 

 

 

 

 

 

 

• Inspect spark electrode and associated wiring for

 

 

damage and connection. Reference page 31 of this

Flame Fail Ign

 

manual for removal and cleaning procedures.

(will require a manual

 

Replace if necessary.

 

 

 

 

• Check for proper electrical grounding of the unit.

 

reset once the condition

The unit has failed to prove main burner

 

has been corrected.

• Check incoming supply gas

pressure.

Natural

gas

Press the RESET button

ignition after four (4) attempts.

pressures should be between 4 - 14 inches w.c. and

on the SMART SYSTEM

 

 

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

display to reset.)

 

Refer to Section 7 - Gas Connections of the Knight

 

 

XL Installation and Operation Manual for detailed

 

 

information concerning the gas supply.

 

 

 

 

 

 

 

 

38

Image 38
Contents Models 400 Contents Niosh stated First Aid Please read before proceedingHandling ceramic fiber materials 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 DisplayMenu Description See User Access Installer Access Display ModifyParameter table 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 VersionFunctions Temperature SettingsData Logging DHW Settings Outdoor Reset Anti-Cycling Controlling Sensor Ramp SettingsControl modes BMS Thermostat InputCascade Offset Minimum On/Off TimeCirculation pumps Service Notification Owner maintenance Maintenance Maintenance and annual startupService technician 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 DiffOutlet Temp Flue Temp HighDelta T High No Error Stored Service BlkWatch Dog Error Rem Ctrl FltCombustion Analysis Procedure Models 601 Gas valve adjustment procedureModel
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400, 801 specifications

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