Service Manual

Bradford White

U2TW Series

Gas Water Heaters

Table of Contents

Page U2TW Service Procedure

Introduction 4 - - -

How to Use This Manual 5 - - -

Tool Required for Service 5 - - -

Specifications 6 - - -

Control Timings 8 - - -

Sequence of Operation 9 - - -

Troubleshooting 12 - - -

Burner and Inner Door/Gasket Removal, Inspection

Replacement and Reinstallation 14 I

Burner Operation Inspection, Cleaning and Replacement 17 II

Pilot Testing, Cleaning and Replacement 19 III

Pressure Switch Testing and Replacement 20 IV

Blower Testing and Replacement 22 V

Blower Temperature Switch Testing and Replacement 24 VI

Gas Control Testing and Replacement 26 VII

Simulated Resistive Device Testing and Replacement 28 VIII

Resettable Thermal Switch Testing and Replacement 29 IX

Safety Circuit Voltage Trace 31 X

115VAC Circuit Trace 32 XI

Dip Tube Inspection and Replacement 33 XII

Anode Inspection and Replacement 34 XIII

Flue Baffle Inspection and Replacement 35 XIV

Glossary of Terms 36 - - -

Parts List 39 - - -

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