Bradford White D-4-504S6FSX - Manual (Page 28)

28
TROUBLESHOOTING
LED Status Control Status Probable Cause
None (LED not on
or flashing)
Electrical pow er not
present
Control pow er sw itch in " OFF" position.
Supply voltage interrupted.
One short flash
every four
seconds
Stand-by mode,
Thermostat is satisfied (no
faults)
Temperature demand is satisfied (no call for
heat)
Alternates bright
and dim
(heartbeat)
Thermostat calling for heat
(no fault)
Tank temperature below setpoint of
thermostat
Short flash once
every second
Weak pilot signal on last
call for heat
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
Tw o flashes,
three second
pause
Damper test circuit not
w orking
1. Damper not in proper position or
malfunctioning - stuck in open position
2. Obstructed venting
3. Faulty damper
Three flashes,
three second
pause
Damper test circuit not
w orking
1. Damper not in proper position or
malfunctioning - not reaching full open
position
2. Obstructed venting
3. Faulty damper
Four flashes,
three second
pause
Excessive tank
temperature, system must
be reset
1. Thermal w ell sensor out of calibration
2. Faulty gas valve
Five flashes,
three second
pause
False pilot flame present Pilot valve stuck in open position
Six flashes, one
flash, three
second pause
(Soft Lockout)
Failed to light pilot,
system resets after (5)
minutes
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