Bradford White LG2PDV50H60N Service Manual page 14

PDV Series
Observe green LED indicator on
Electronic gas control. Status flash
codes are displayed with a three second
pause before repeating. Check and
repair the system as noted in the
troubleshooting table below
LED Status Control Status
None, control
No electrical
LED not on or
power
flashing
Stand-by mode,
Short flash, once
every four Waiting for call
seconds
for heat (no fault).
Thermostat
"Heartbeat",
alternates calling
bright/dim
for heat (no fault).
Weak pilot signal
Short flash once
on last call for
per second
heat.
Pressure switch
Two flash, three
not working-
second pause
closed position.
Pressure switch
Three flash, or blower temp.
three second switch not
pause working -open
position.
Excessive tank
Four flash, three temperature.
second pause
System must be
reset.
Undesired-false
Five flash, three
pilot flame
second pause
present.
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Probable Cause
Control power switch in "OFF" position.
Supply voltage interrupted.
Temperature demand is satisfied.
Tank temperature below set point of
thermostat.
1. Unstable pilot.
2. Pilot tube block or restricted.
3. Oxidation builds up on pilot electrode.
4. Wire damage to pilot assembly or bad
connection at gas valve.
1. Pressure switch tubing kinked or blocked.
2. Blocked pressure tap on switch or blower.
3. Faulty pressure switch.
1. Vent blockage or improper vent
configuration.
2. Pressure switch tubing kinked or blocked.
3. Faulty pressure switch.
4. Blower not spinning up to speed.
5. Blower temp or exhaust temp too high.
6. Faulty blower temperature switch.
1. Temperature sensor out of calibration.
2. Faulty gas control.
3. Plumbing leak.
1. Pilot valve stuck in open position.
Service
Procedure
Turn power on
Normal operation.
Adjust thermostat to
temp level
Normal operation.
Adjust thermostat to
temp level
Page 17
Page 18
1. Check vent or vent
tables.
2 & 3 Page 18
4. Page 20
5 & 6 Page 22
1 & 2. Replace gas
control, page 26
Replace gas control,
page 26