Boiler Installation and Owners Manual
22
LDJ991_E01_R03_2006.03
Models LDJ991 and LDJ991-10
Mechanical / Electrical
Problem
Explanation
What to do
Boiler auger, bin
auger, and combus-
tion fan all do not
operate
High limit switch defective or discon-
nected. All power for the boiler auger, bin
auger, and combustion fan is supplied
through the High Limit Switch.
Verify power to high limit switch.
Verify high limit switch is closed when
boiler is cool.
Combustion fan will
operate but boiler
auger and bin auger,
do not operate
Variable input timer defective.
Check variable input timer.
Low limit switch defective.
Check low limit switch.
Defective heat relay or no HEAT signal
from thermostat or defective 24V trans-
former.
Verify that transformer is okay.
Verify HEAT signal from thermostat.
Check heat relay.
The START/OFF/ON switch left in START
position after starting fire in burn pot.
Change switch to ON.
