Section 9: Troubleshooting - Harman Super-Magnum Coal Stoker Stove Owner's Manual Installation And Operation

Super-Magnum Coal Stoker Stove
9
Troubleshooting
Symptom
Plug in appliance - No
response.
Fire out, no fuel on grates.
Fire out, grates full of fuel.
Unburned or partially
burned coal in ash pan.
Coal pushing out the sides
of the grate frame.
Excessive fines in fines
tray.
Turned to "OFF" won't shut
down.
Distribution Blower not
operating.
3-90-02702R4_08/12
With Proper installation, operation, and maintenance, your appliance will provide
years of trouble-free service. If you do experience a problem, this troubleshooting
guide will assist a qualified person in the diagnosis of a problem and the corrective
action to be taken. This troubleshooting guide is intended for use by qualified
service technicians only.
Possible Cause
No current to outlet.
Defective power cord / connection.
Defective fuse on circuit board.
Circuit board defective.
Out of fuel.
Wet coal bridged in hopper.
Foreign object obstruction - Hopper.
Foreign object obstruction - Feeder.
Feed system malfunction.
Combustion blower restrictor closed.
Combustion blower positioning.
Ash build-up under grates.
Failed starting process.
ESP failure - temp on DDM reads
abnormally high when stove is cold.
Black rocks in coal.
Feed rate too high.
Clinkers in ashes restricting flow of
fuel over the burn grates.
Dirty coal supply.
Feed restriction causing grinding.
Fines scraper adjustment.
Not enough time allowed.
Dirty or failed ESP.
Mode selector not truly in the "OFF"
position.
Room Temperature demand met.
Insuccessful ignition.
Corrective Action
Check circuit breaker at service panel.
Re-connect or replace power cord.
Replace 6 amp fuse on board.
Replace circuit board.
Check hopper. Fill with fuel.
Do not load wet coal in hopper.
Empty the hopper, searching for object.
With hopper empty examine feed throat.
Verify operation of motor, pusher arm,
and pusher block.
Re-set restrictor using draft meter.
Be sure that the blower is in its mount.
Remove grates and clean air chamber.
Follow start up procedure.
Replace ESP.
Try different coal.
Set feed adjuster to lower setting.
Re-set restrictor using draft meter. Too
much air flow will cause the ashes to
fuse together.
Wet coal will not flow properly.
Try different coal.
Remove coal from hopper and check for
a foreign object or large piece of coal.
Re-adjust scraper (See Page 29).
Shut-down sequence: Minimum feed un-
til ESP cools. Combustion blower should
be off unless fire is at maximum temp.
Remove and clean probe.
Attach DDM to monitor temperature and
shut-down parameters.
The status light will turn off when the
knob is in the "OFF" position. (unless
there is a 3 blink error code.)
Upon meeting the room temperature
setpoint, the blower will stop.
Also, the distribution blower will not run
until the ESP senses a high enough tem-
perature to ensure that the discharged
air is warm.
Do Not Burn Wet Coal!
23