Troubleshooting - Bradford White D4403S*F(BN Service Manual

Residential flue damper

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Table Of Contents

Table of Contents

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.

LED Status

Control Status

None (LED

Electrical power not

not on or

present

flashing)

One short

Stand-by mode,

flash every

Thermostat is

four seconds

satisfied (no faults)

Alternates

bright and

Thermostat calling

dim

for heat (no fault)

(heartbeat)

Short flash

Weak pilot signal

once every

on last call for heat

second

Two flashes,

Damper test circuit

three second

not working

pause

Three

flashes,

Damper test circuit

three second

not working

pause

Excessive tank

Four flashes,

temperature,

three second

system must be

pause

reset

Five flashes,

False pilot flame

three second

present

pause

Six flashes,

one flash,

Failed to light pilot,

three second

system resets after

pause (Soft

(5) minutes

Lockout)

Probable Cause

Control power switch in "OFF"

position.

Supply voltage interrupted.

Temperature demand is satisfied

(no call for heat)

Tank temperature below

setpoint of thermostat

1. Unstable pilot

2. Pilot tube blocked or restricted

3. Oxidation build-up on pilot

electrode

4. Wire damage to pilot

assembly or bad connection at

gas control

1. Damper not in proper position

or malfunctioning - stuck in open

position

2. Obstructed venting

3. Faulty damper

1. Damper not in proper position

or malfunctioning - not reaching

full open position

2. Obstructed venting

3. Faulty damper

1. Thermal well sensor out of

calibration

2. Faulty gas control

Pilot valve stuck in open position Replace gas control

1. Unstable pilot

2. Pilot tube block or restricted

3. Oxidation build-up on pilot

electrode

4. Wire damage to pilot

assembly or bad connection at

gas valve