Bradford White D100T250 User Manual

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Manual 47985A REV 08/18
SERVICE
MANUAL
Troubleshooting Guide
and Instructions for Service
(To be performed ONLY by
qualified service providers)
Models Covered
by This Manual:
For The Bradford White
“D” Series Models:
D38T155
D75T(125,160,300)
D65T(370,399)
D80T(180,199,250)
D80T(425,505)
D100T(199,250)
D80L(399,450,505)
D100L(199,250,270,300)
D100S(199,250)
Gas Water Heaters
COMMERCIAL 24 VOLT FLUE DAMPER
SERIES WATER HEATER WITH HONEYWELL
INTEGRATED CONTROL SYSTEM
®

Bradford White D100T250 Specifications

General

Brand	Bradford White
Model	D100T250
Category	Water Heater
Language	English

Summary

Sequence of Operation and Lockout States

Understanding Lockout Conditions

Troubleshooting Common Issues

Accessing Water Heater Service Mode

Step-by-step instructions for service personnel to enter the water heater's diagnostic service mode.

Error Code Display and History Access

Explains how error codes are displayed and how to access the stored error code history.

Navigating Through Error Code History

Finalizing Error Code History Review and Exit

Honeywell Integrated Control Error Code Definitions

Resetting Lockout Conditions and Malfunctions

Procedures for resetting soft and hard lockouts, emphasizing correction of the underlying fault.

Service Procedure D24-I: Thermostat Circuit Testing

Sensor Resistance and Wiring Continuity Checks

Details testing sensor resistance and checking wire harness continuity for faults.

Resetting High Water Temperature Lockout

Steps for resetting error code 65 (High Water Temperature) after addressing the cause.

Sensor Resistance vs. Temperature Correlation

Service Procedure D24-II: Pilot Operation Testing

Pilot Ignition and Gas Flow Testing

Guides on testing pilot spark, voltage to gas valve, and checking for pilot gas flow.

Pilot Burner Assembly Inspection Procedures

Procedures for inspecting the pilot shield, flame rod, and pilot orifice for proper function.

Flame Sense Lead and Microamp Output Testing

Focuses on checking the flame sense lead and measuring pilot microamp output for flame signal verification.

Service Procedure D24-III: Main Burner Operation Testing

Main Burner Ignition and Voltage Checks

Covers testing main burner ignition, voltage to the gas valve, and pilot status during heating.

Troubleshooting Main Burner Short Cycling Issues

Service Procedure D24-IV: Main Burner & Pilot Removal and Inspection

Main Burner Assembly Removal and Inspection

Pilot Burner Removal and Orifice Inspection

Service Procedure D24-IV: Control Board Replacement

Service Procedure D24-V: Flue Baffle Removal and Inspection

Service Procedure D24-VI: Anode Removal and Inspection