Bradford White EF120T5003NA3 - User Manual

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Manual 238-53597-00D REV 3/21
SERVICE
MANUAL
Troubleshooting Guide
and Instructions for Service
(To be performed ONLY by
qualified service providers)
Models Covered
by This Manual:
EF120T4003(N,X)(A)3
EF120T5003(N,X)(A)3
Commercial Ultra High Efficiency Models
with Direct Spark Ignition and ICON Control System
Effective: March 2021
ECO 8323

Summary

Specifications

Sequence of Operations

Lockout Conditions

Troubleshooting

System Observation for 120 T400;500 Models with Direct Spark Ignition

Initial diagnostic steps to identify water heater faults and blank display issues.

Diagnostic Mode

Service Error Codes and Troubleshooting Procedures

Comprehensive list of error codes, their definitions, causes, and corrective actions.

Service Procedure I: Thermostat Circuit Testing and Replacement

Thermostat Sensor (Thermistor) Replacement Procedure

Detailed steps for safely removing and replacing the water heater's thermostat sensor.

Service Procedure II: Combustion System Testing and Replacement

Combustion System Removal Procedure

Step-by-step guide for safely removing the combustion system components.

Combustion System Replacement Procedure

Instructions for installing a new combustion system assembly.

Service Procedure III: Burner Tube Inspection and Replacement

Burner Tube Inspection

Guidelines for visually inspecting the burner tube for damage or deterioration.

Burner Tube Replacement Procedure

Service Procedure IV: Gas Valve Replacement

Service Procedure V: Blower Testing and Replacement

Blower Replacement Procedure

Service Procedure VI: Blocked Vent Pressure Switch Testing and Replacement

Check Exhaust Tube Pressure

Exhaust Pressure Switch Replacement Procedure

Service Procedure VII: Flame Sensor Testing and Replacement

Flame Sensor Replacement Procedure

Service Procedure VIII: Spark Rod Gap Adjustment and Replacement

Spark Rod Replacement Procedure

Service Procedure IX: Ignition Control Board Replacement

Service Procedure X: Transformer Replacement

Service Procedure XI: Vent Safety Switch Testing and Replacement

Vent Safety Switch Replacement Procedure

Service Procedure XII: Power Anode Inspection and Replacement

Water Heater Installation Checklist

Bradford White EF120T5003NA3 Specifications