Troubleshooting - Bradford White D4403S series Manual

TROUBLESHOOTING

LED Status Control Status
None (LED not on Electrical pow er not
or flashing) present
One short flash Stand-by mode,
every four Thermostat is satisfied (no
seconds faults)
Alternates bright
Thermostat calling for heat
and dim
(no fault)
(heartbeat)
Short flash once Weak pilot signal on last
every second call for heat
Tw o flashes,
Damper test circuit not
three second
w orking
pause
Three flashes,
Damper test circuit not
three second
w orking
pause
Four flashes, Excessive tank
three second temperature, system must
pause be reset
Five flashes,
three second False pilot flame present
pause
Six flashes, one
Failed to light pilot,
flash, three
system resets after (5)
second pause
minutes
(Soft Lockout)
Probable Cause
Control pow er sw itch 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 valve
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 w ell sensor out of calibration
2. Faulty gas valve
Pilot valve stuck in open position
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
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