Section 9: Troubleshooting - Harman Super-Magnum Owner's Manual

Super-Magnum Coal Stoker Stove
9
Troubleshooting
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.
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 operat-
ing.
3-90-02702R6_03/13
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 abnor-
mally 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 until
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 set-
point, the blower will stop.
Also, the distribution blower will not run until
the ESP senses a high enough temperature
to ensure that the discharged air is warm.
Do Not Burn Wet Coal! 23