Bradford-White Corp U4TW40T*FRN, U4TW50T*FRN, U4TW60T*FRN service manual Troubleshooting

Page 19

 

 

 

 

 

Troubleshooting

 

 

 

 

 

 

 

 

 

LED Status

Control Status

 

Probable Cause

 

Service Procedure

 

 

 

 

 

 

 

 

 

 

 

 

1.

Damage to thermal well wires

 

 

 

 

 

 

2.

Thermal well sensor resistance

 

 

 

 

Eight flashes,

Thermal well sensor

out of range

 

 

 

 

three flashes,

damaged or un-

3.

Replace thermal well

 

See Thermal Well Testing on

 

 

plugged or gas con-

4.

Verify control is not wet or

 

 

 

three second

trol electronics fault

physically damaged

 

page 34

 

 

pause

detected

5.

Reset control on/off switch

 

 

 

 

 

 

 

 

 

 

 

6.

Replace gas control if 8-3 error

 

 

 

 

 

 

persists

 

 

 

 

 

 

 

 

 

 

 

 

Eight flashes,

 

1.

Verify control is not wet or

 

1. Replace gas control if wet

 

 

 

physically damaged

 

 

 

four flashes,

Gas control fault

 

or physically damaged

 

 

2.

Reset control on/off switch

 

 

 

three second

detected

 

2. Cycle power

 

 

3.

Replace gas control if 8-4 error

 

 

 

pause

 

 

3. Replace gas control

 

 

 

 

persists

 

 

 

 

 

 

 

 

 

 

 

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Contents Service Manual Table of Contents Page Page Introduction Bradford White ECO-DEFENDER Safety SystemHow the Safety System Works How to Use this ManualTools Required Tools Required for ServiceSpecifications Gallon Vent TablesSpecifications Control Timings Wiring DiagramSequence of Operation Power Up SequenceNormal Heating Sequence Abnormal Operation Normal Heating Sequence cont’dAbnormal Operation cont’d Sequence of Operation Sequence of Operation LED Status Control Status Probable Cause Service Procedure TroubleshootingTroubleshooting Troubleshooting Burner Cleaning Procedure Burner MaintenanceBurner Inspection Burner Cleaning Procedure cont’d Pilot Inspection, Testing and Replacement Pilot MaintenancePilot Inspection, Testing and Replacement cont’d Page Pressure Switch Testing Pressure Switch TestingPressure Switch Testing cont’d Pressure Switch Replacement Pressure Switch ReplacementBlower Testing Blower TestingPage Blower Installation Blower ReplacementBlower Removal Blower Installation cont’d Blower Temperature Switch TestingBlower Temperature Switch Testing Switch Setting Blower Temperature Switch Testing cont’dBlower Temperature Switch Replacement Blower Temperature Switch ReplacementThermal Well Testing Thermal Well TestingThermal Well Testing cont’d Determine Tank TemperatureDetermine Water Temperature Inside Tank Sensor Resistance at Various Temperatures Component DisassemblyGas Control & Thermal Well Removal From Water Heater Gas Control Removal Gas Control Assembly to the Thermal Well Gas Control AssemblyGas Control Removal From Thermal Well cont’d Gas Control Assembly to the Thermal Well cont’d Flammable Vapor Sensor Testing Flammable Vapor Sensor TestingVAC Circuit Trace Safety Circuit Voltage Trace Safety Circuit Voltage TraceBlower Removal Remove the Blower to Gain Access to the Flue BaffleDip Tube Inspection and Replacement Remove the Blower to Gain Access to the Flue Baffle cont’dDip Tube Inspection Anode Inspection Anode Inspection and ReplacementInner Door Removal Inner Door Removal ProcedureInner Door Removal Procedure cont’d Inner Door Gasket ReplacementInner Door Gasket Replacement Procedure Inner Door Installation with Gasket Inner Door InstallationScreenLok Flame Arrestor Cleaning Procedure Arrestor CleaningCommon Terms Common TermsPart Name and Description Parts ListParts@bradfordwhite.com Techserv@bradfordwhite.com
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