Bradford White M1TW40S Series User Manual

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Manual 238-46238A-00A
SERVICE
MANUAL
Troubleshooting Guide
and Instructions for Service
(To be performed ONLY by
qualified service providers)
Models Covered
by This Manual:
M1TW40S*F (BN,CX,SX)
M1TW50S*F (BN,CX,SX)
M1TW60T*F (BN,CX,SX)
M4TW40T*F (BN,SX)
M4TW50T*F (BN,SX)
M4TW60T*F (BN,SX)
M2TW50T*F (BN,CX,SX)
M2TW65T*F (BN,CX,SX)
TW450S65F (B,C,S)*(N,X)
TW465S65F (B,C,S)*(N,X)
(*) Denotes Warranty Years
Through-The-Wall Gas Water Heaters
TTW Series
®

Bradford White M1TW40S Series Specifications

General

Capacity	40 Gallons
Fuel Type	Natural Gas
Type	Tank
Vent Type	Atmospheric
Warranty	6 years

Summary

SERVICE MANUAL

Troubleshooting Guide and Instructions for Service

Provides guidance for diagnosing and resolving issues with the water heater.

Sequence of Operation

Abnormal Operation

Details various fault conditions, their causes, and corresponding error codes displayed by the gas control.

Troubleshooting

TTW SERVICE PROCEDURE I Burner Operation Inspection, Adjustment, Cleaning and Replacement

TTW SERVICE PROCEDURE II Pilot testing, Cleaning and Replacement

Pilot Inspection, Testing and Replacement

Detailed steps for assessing the pilot assembly's condition and performing necessary maintenance or replacement.

TTW SERVICE PROCEDURE III Pressure Switch Testing and Replacement

Pressure Switch Testing

Provides a flowchart for diagnosing pressure switch operation and related components.

Pressure Switch Replacement

Step-by-step instructions for safely removing and installing a new pressure switch.

TTW SERVICE PROCEDURE IV Blower Testing and Replacement

Blower Testing

A diagnostic procedure to check blower operation, voltage, and pressure readings.

TTW SERVICE PROCEDURE V Blower Temperature Switch Testing and Replacement

Blower Temperature Switch Testing.

Outlines the process for checking the continuity and operation of the blower temperature switch.

Blower Temperature Switch Replacement.

Step-by-step instructions for removing and installing a new blower temperature switch.

TTW SERVICE PROCEDURE VI Gas Control/Thermal Well Testing and Replacement

Gas Control & Thermal Well Removal From Water Heater

Gas Control Assembly to Thermal Well

Thermal Well Testing

Steps to test the thermal well sensor's resistance and determine its condition.

Gas Control Removal From Thermal Well

TTW SERVICE PROCEDURE VII Flammable Vapor Device Testing

Flammable Vapor Device Testing

TTW SERVICE PROCEDURE VIII Safety Circuit Voltage Trace

Safety Circuit Voltage Trace

TTW SERVICE PROCEDURE IX 115 VAC Trace

115 VAC Circuit Trace

TTW SERVICE PROCEDURE XIII Inner Door/Gasket Removal, Inspection Replacement and Reinstallation