Harman Stove Company PB 105, Installation & Operating Manual

32

FEEDER DOES NOT FEED

1. No pellets in hopper.
2. Firebox draft may be too low for low draft
pressure switch in feeder circuit to operate.
Check for closed doors, loose or missing
gasket on doors or hopper lid, or a faulty pres-
sure switch.
3. Feed motor will not run until ESP
senses 170 deg. F. Maybe you did not put
enough pellets in the burn pot before lighting the
fire manually.
4. Something is restricting flow in the hopper or
causing the slide plate to stick.
5. Feed motor has failed.

PARTIALLY BURNED PELLETS

1. Feed rate too high.
2. Draft too low. (Check burn pot clean-out slide
and door gasket).
3. Burn pot or heat exchanger tubes may need
to be cleaned.
4. Combination of all the above.
5. #6 status blink: A 6 blink control board status
indication is caused by poor or incomplete
combustion. The Automatic Ignition circuit board
has the ability to track the combustion through
feed settings and ESP temperatures. When the
control board has calculated poor or incomplete
combustion, it will shut down the unit as a safety
feature. (Poor or incomplete combustion is a
contributer of creosote which may cause a
chimney fire)
A 6 blink status may be caused by several things:
1. Blocked or partially blocked flue.
2. Blocked or partially blocked inlet air.

a. Backdraft damper on the inlet pipe may be

stuck closed.

b. If outside air is installed, the inlet cover may

be blocked.
3. The air chamber under the burnpot may be
filled with fines and small bits of ash.
4. The holes in the burnpot may be getting filled
with ash or carbon buildup.
5. Combustion blower fan blades may need
cleaned.
6. There is no fuel in the hopper.

SMOKE SMELL

Seal the vent pipe joints and connection to stove
with silicone.

FIRE HAS GONE OUT

1. No pellets in hopper.
2. Draft setting is too low.
3. Something is restricting fuel flow.
4. Feed motor or combustion blower has failed.
5. Power failure or blown fuse.

SMOKE IS VISIBLE COMING OUT OF VENT

1. Air-fuel ratio is too rich.

A. Feed rate too high.
B. Draft too low caused by a gasket leak.

LOW HEAT OUTPUT

1. Feed rate too low
2. Draft too low because of gasket leak.
3. Poor quality or damp pellets
4. Combination of 1 and 2.

Cleaning Burn Pot

Whenever your boiler is not burning, take the

opportunity to scrape the burn pot to remove
carbon buildup. A vacuum cleaner is handy to
remove the residue. Be sure the boiler is cold
if you use a vacuum.

Carbon buildup can be scraped loose with

the fire burning using the special tool provided
with your stove. Scrape the floor and sides of the
burn pot. The carbon will be pushed out by the
incoming fuel. Always wear gloves to do this.

Removing Ashes

Ashes can be removed while in operation,

but extra care must be taken and always wear
gloves.

Maximum Feed Adjuster settings are not

needed in most cases. Operating in the normal
range (#4) is recommended when maximum heat
output is not required. The ESP probe prevents
the stove from being over-fired.

Keep the boiler free of dust and dirt.

Fuel

Pellet fuels are put into 3 categories in terms

of ash content. Premium at 1% or less, Standard
at 3% or less  and all others at 3% or more.

The PB105 is capable of burning all 3 catego-

ries of pellets due to a patented feeder and burn
pot system.

It should be noted, however, that higher ash

content will require more frequent ash removal,
scraping of the burn pot, and may provide less
BTU's per pound. Normally, standard and high ash
pellets cost less than premium pellets and can be
cost effective when burned in the PB105.

The moisture content must not exceed 8%.

Higher moisture will rob BTU's and may not burn
properly.

Troubleshooting

Helpful Hints