Bradford-White Corp D4403S*F(BN, D4504S*F(BN Troubleshooting, Probable Cause Service Procedure

Page 13

Troubleshooting

Observe the green LED on the water heater gas control. Error codes are displayed with a 3 second pause before repeating. Once the error code is known, check and repair the water heater, as recommended in the table below.

Green LED

LED Status

Control Status

 

Probable Cause

Service Procedure

None (LED

Electrical power not

Control power switch in "OFF"

Turn Power On

not on or

present

position.

flashing)

Supply voltage interrupted.

 

 

 

One short

Stand-by mode,

Temperature demand is satisfied

 

flash every

Thermostat is

Normal operation

four seconds

satisfied (no faults)

(no call for heat)

 

Alternates

 

 

 

 

bright and

Thermostat calling

Tank temperature below

Normal operation

dim

for heat (no fault)

setpoint of thermostat

 

(heartbeat)

 

 

 

 

 

 

1.

Unstable pilot

 

 

 

2.

Pilot tube blocked or restricted

1. See Burner Inspection on

Short flash

Weak pilot signal

3.

Oxidation build-up on pilot

page 15

once every

electrode

2-4. See Pilot Inspection,

second

on last call for heat

4.

Wire damage to pilot

Testing and Replacement on

 

 

assembly or bad connection at

page 17

 

 

gas control

 

 

 

 

 

 

 

 

1.

Damper not in proper position

1. Verify cord sets are fully

Two flashes,

 

or malfunctioning - stuck in open

plugged in

three second

Damper test circuit

position

2. Verify switch on damper is

pause

not working

2.

Obstructed venting

in "Automatic" position

 

3. Verify that damper and

 

 

3.

Faulty damper

 

 

venting is not obstructed

 

 

 

 

Three

 

1.

Damper not in proper position

1. Verify cord sets are fully

 

or malfunctioning - not reaching

plugged in

flashes,

Damper test circuit

2. Verify switch on damper is

full open position

three second

not working

2.

Obstructed venting

in "Automatic" position

pause

 

3. Verify that damper and

 

3.

Faulty damper

 

 

venting is not obstructed

 

 

 

 

Four flashes,

Excessive tank

1.

Thermal well sensor out of

1. Test Gas Control & Thermal

temperature,

Well

three second

calibration

system must be

2. Replace gas control if

pause

2.

Faulty gas control

reset

necessary

 

 

 

Five flashes,

False pilot flame

 

 

 

three second

Pilot valve stuck in open position

Replace gas control

present

pause

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1.

Unstable pilot

 

Six flashes,

 

2.

Pilot tube block or restricted

1. See Burner Inspection on

one flash,

Failed to light pilot,

3.

Oxidation build-up on pilot

page 15

three second

system resets after

electrode

2-4. See Pilot Inspection,

pause (Soft

(5) minutes

4.

Wire damage to pilot

Testing and Replacement on

Lockout)

 

assembly or bad connection at

page 17

 

 

gas valve

 

 

 

 

 

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Contents Service Manual Table of Contents Page Page How the Safety System Works Bradford White Defender Safety SystemIntroduction IntroductionHow to Use this Manual How to Use this ManualSpecifications Wiring Diagram Damper Powered Open Power Up SequenceSequence of Operation Normal Heating SequenceNormal Heating Sequence cont’d Damper Safety Circuit Fault Abnormal Operation cont’d Temperature Sensor FaultTrial for Ignition Fault Abnormal Operation cont’d Flame Sensing Fault Probable Cause Service Procedure TroubleshootingLED Status Control Status Probable Cause Service Procedure Burner Cleaning Procedure Burner MaintenanceBurner Inspection Right side inner door Main burner Orifice Burner Cleaning Procedure cont’d Pilot MaintenancePilot Inspection, Testing and Replacement Pilot Inspection, Testing and Replacement cont’d Damper Removal & Installation Damper ReplacementDamper Removal & Installation cont’d Thermal Well Testing Thermal Well TestingThermal Well Testing cont’d Determine Tank TemperatureDetermine Water Temperature Inside Tank Sensor Resistance at Various Temperatures Component DisassemblyGas Control & Thermal Well Removal From Water Heater Gas Control & Thermal Well Removal From Water Heater cont’d Gas Control RemovalGas Control Removal From Thermal Well Gas Control Assembly to the Thermal Well Gas Control AssemblyGas Control Removal From Thermal Well cont’d Gas Control Assembly to the Thermal Well cont’d Flammable Vapor Sensor Testing Flammable Vapor Sensor TestingVAC Circuit Trace Dip Tube Inspection Dip Tube Inspection and ReplacementAnode Inspection Anode Inspection and ReplacementDamper Removal Remove the Damper to Gain Access to the Flue BaffleRemove the Damper to Gain Access to the Flue Baffle cont’d Inner Door Removal Inner Door Removal ProcedureInner Door Removal Procedure cont’d Inner Door Gasket ReplacementInner Door Gasket Replacement Procedure Inner Door Installation with Gasket Inner Door InstallationScreenLok Flame Arrestor Cleaning Procedure Arrestor CleaningDamper Relay Installation Damper Relay Installation cont’d Damper Relay InstallationConnect the other ends of the relay harness, as shown Common Terms Common TermsPart Name and Description Parts ListParts@bradfordwhite.com Techserv@bradfordwhite.com

SX), D4504S*F(BN, D4403S*F(BN specifications

Bradford-White Corp has long been a pioneering name in the water heating industry, and their D4403S*F(BN, D4504S*F(BN, and SX models represent the company’s commitment to delivering high-quality, efficient solutions for residential and commercial applications. These water heaters are designed with various user needs in mind, ensuring that homeowners and businesses can enjoy a reliable hot water supply whenever needed.

One of the core features of these models is their advanced water heating technology. Utilizing power venting systems, these units ensure efficient heat transfer while minimizing heat loss. This technology promotes energy efficiency and helps users save on their energy bills. The power vent system also allows for flexible installation options, accommodating different types of venting configurations, which is especially useful in homes with unique designs or limited space.

The Bradford-White D4403S*F(BN and D4504S*F(BN models are equipped with their state-of-the-art Hydrojet Total Performance System. This feature not only enhances the heater's overall performance but also reduces sediment buildup within the tank, which can significantly extend the unit's lifespan and maintain efficiency over time. Moreover, the patented Vitraglas® lining protects the inner tank from corrosion, further prolonging the life of the appliance.

Safety is a paramount consideration in Bradford-White's design philosophy. Each model includes a robust Flammable Vapor Ignition Resistance (FVIR) system, which helps prevent the ignition of flammable vapors that may be present in the vicinity of the water heater. This feature meets stringent safety standards and provides peace of mind to users.

In terms of energy specifications, both the D4403S*F(BN and D4504S*F(BN models are designed to meet or exceed efficiency standards, contributing to lower energy consumption and environmental impact. The SX model is particularly notable for its user-friendly digital display and controls, allowing for easy temperature adjustments and efficient operation monitoring.

In conclusion, Bradford-White Corp's D4403S*F(BN, D4504S*F(BN, and SX models are a testament to the company’s dedication to quality, safety, and efficiency in water heating technology. With their innovative features, user-friendly design, and long-lasting durability, these water heaters are well-suited to meet the ever-evolving demands of modern households and commercial settings alike. As homeowners and businesses continue seeking reliable hot water solutions, Bradford-White stands out as a trusted choice in the industry.