Bradford White M4403T Service Manual

SERVICEMANUALFlammable Vapor Ignition Resistant Water HeaterTroubleshooting Guideand Instruction for Service(To be performed ONLY by qualified service

10SERVICE PROCEDURE RG-IIIPilot Assembly Inspection,Cleaning and ReplacementPilot/Electrode Assembly Inspection,Cleaning and ReplacementStep 1. Turn

11SERVICE PROCEDURE RG-IVPiezo Igniter, ElectrodeTesting and ReplacementPiezo Igniter, Electrode Testing and ReplacementWith the pilot not in operatio

Combination Thermostat/Gas Valve Testing and ReplacementThe combination thermostat/gas valve is a non repairable device. If trouble shooting has deter

THERMOCOUPLE TESTINGSee SERVICE PROCEDURE IIMAGNET ASSEMBLY TESTINGStep 1. Disconnect thermocouple from combination thermostat/gas valve.Step 2. Con

COMBINATION THERMOSTAT/GAS VALVE REPLACEMENTStep 1. Rotate knob of the combination thermostat/gas valve to the “OFF” position.Step 2. Turn off gas su

15Step 7. Removal of combination thermostat/gas valve.a) Disconnect main burner feedline (3/4” wrench), pilot tube (7/16" wrench) and thermocoup

Step 9. Reinstallation of inner door assembly. (cont.)b) Clean any gasket residue or other debris from combustion chamber surface before installing t

MAIN BURNER: Inspection, Adjustment, Cleaning and ReplacementAt periodic intervals (not more then 6 months) a visual inspection should be made of the

MAIN BURNER: Inspection, Adjustment, Cleaning and Replacement (cont.)Step 3. Fully inspect inner gasket per SERVICE PROCEDURE RG-I, step 4. Replace g

BURNER CLEANING (cont.)Step 5. Disconnect (unscrew) main burner (stamped steel “B” burner) from main burner orifice or on cast iron burners (“C” burn

2Flammable Vapor Ignition Resistant Water HeaterTable of ContentsPage Service ProcedureIntroduction 3 - - -Trouble shooting Chart 4 - - -Inner Door

RESETTABLE THERMAL SWITCH CONTINUITY TESTINGStep 1. Remove outer jacket door.Step 2. Disconnect wire leads from resettable thermal switch.Step 3. U

RESETTABLE THERMAL SWITCH REPLACEMENTStep 1. Rotate knob of combination thermostat gas valve to the off position.Step 2. Remove outer jacket door.St

ScreenLok Flame Arrestor CleaningStep 1. Rotate knob of combination thermostat gas valve to the off position.Step 2. Remove outer jacket door.Step 3

23Dip Tube Inspection and ReplacementStep 1. Rotate knob of combination thermostat/gas valve to “OFF” position.Step 2. Turn off cold water supply to

24Anode Inspection and ReplacementStep 1. Turn off water supply to water heater. Rotate knob of combination thermostat/gas valve to “OFF” position.St

251 Draft Hood2 Hot Water Outlet/Anode3 Cold Water Inlet Tube4 Flue Baffle5 T&P Relief Valve6 Thermostat7 Piezo Igniter8 Brass Drain Valve9 Screw-

26Notes

27Notes

Sales/800-523-2931Fax/215-641-1670Technical Support/800-334-3393Fax/269-795-1089Warranty/800-531-2111Fax/269-795-1089International:Telephone/215-641-9

3IntroductionThe Bradford White DEFENDER Safety System™The Bradford White DEFENDER Safety SystemTMwas designed to resist the ignition of flammablevapo

4SYMPTOM PROBABLE CAUSECORRECTIVE ACTIONPilot WillNot Light1. No incoming gas or toolow gas pressure.2. Gas control knob setto wrong position.3. Pilot

SERVICE PROCEDURE RG-IInner Door/Gasket Removal, InspectionReplacement and ReinstallationInner Door Removal ProcedureStep 1. Rotate knob of the combi

6SERVICE PROCEDURE RG-IInner Door/Gasket Removal, InspectionReplacement and ReinstallationInstallation of Inner Door with GasketStep 7. Clean any res

7SERVICE PROCEDURE RG-IInner Door/Gasket Removal, InspectionReplacement and ReinstallationStep 10. Firmly place right side inner door flange against

8SERVICE PROCEDURE RG-IIThermocouple Testing and ReplacementClosed Circuit Thermocouple TestingStep 1. Disconnect thermocouple from combination therm

9SERVICE PROCEDURE RG-IIThermocouple Testing and ReplacementThermocouple ReplacementStep 1. Turn off gas supply to water heater. Rotate knob of combi