Section 5 - Troubleshooting - Central Boiler Pallet Burner Dual Fuel Owner's Manual

A. OUTDOOR FURNACE DOES NOT HEAT
(BUILDING IS LOSING TEMPERATURE)
1. Out of wood - Check firebox to see if fire is out. Add
wood as necessary. Use good quality wood since
poor quality wood will have very short burn times.
2. Circulation valve(s) closed - Be sure all valves in
the system are open.
3. Circuit breaker off - Check the circuit breaker that
supplies power to the outdoor furnace. If the circuit
breaker has tripped, determine the cause before
resetting it.
4. Solenoid not operating properly - Disconnect
power to the furnace; then check the fuse in the
control panel. If fuse is blown, check damper
door for obstructions and for free movement. Be
sure damper door works freely; then replace the
fuse. Check the solenoid plunger free length. With
the damper door fully closed, the correct length
is between 15/16" and 1" (see Fig. 44). Adjust if
necessary, but do not exceed 1". Be sure that the
damper door (when activated by the solenoid) does
not contact the louvered cover. Lubricate or adjust
as necessary. Check that the spring-loaded linkage
and damper door are not binding and that the spring
is not broken or missing.
5. Circulation pump(s) not operating - Check that
circulation pumps are operating. If not, disconnect
power to the pump. Close valves at the pump.
Disassemble the pump and try to turn the pump
shaft. If the shaft is stuck, replace the pump cartridge.
Replace only the cartridge whenever possible. If
necessary, replace the pump. Follow instructions
supplied with the pump.
6. Air in system - Check for air in the water lines or
heat exchangers. If you hear a gurgling sound in a
heat exchanger, air is present in the system. Shut off
the pump, wait 15 seconds and start the pump. If it
is necessary to force air from lines, refer to Initial
Start-up Procedures.
7. Outdoor furnace exhaust obstructed - Check
furnace exhaust for obstructions by observing the
amount of smoke coming out of the chimney with
the firebox door slightly ajar. If smoke seems very
restricted, remove the firewood and hot coals; then
check the chimney (top and bottom) and behind the
baffle for obstructions.

Section 5 - Troubleshooting

SECTION 5 – TROUBLESHOOTING
8. Building(s) poorly insulated or uninsulated -
Poorly insulated or uninsulated buildings, buildings
with uninsulated or poorly insulated ceilings, or a
lack of proper insulation under radiant flooring can
cause excessive fuel consumption and/or heating
problems.
9. Supply and return lines installed incorrectly -
Make sure the hot supply water line is connected to
the correct fitting on the outdoor furnace and heat
exchanger.
10. Circulation pump(s) installed backwards - Check
that pump flow direction is correct. If not, shut off
power to pump. If the flow is not in the correct
direction, disconnect pump from water line and
reverse pump mounting to correct flow direction.
If the pump is not mounted on the outdoor furnace,
check for proper pump mounting location.
11. Underground supply and return lines insulated
poorly - Heat loss from poorly insulated underground
supply and return lines is often indicated by an
unusually high amount of snow melting above
the lines when the ground temperature is 10º F or
colder.
12. Supply and return lines uninsulated - Uninsulated
supply and return lines in areas that are not intended
to be heated (unheated crawl spaces, etc.) may cause
excessive heat loss. Insulate the supply and return
lines.
13. Poor water quality - Water with high amounts of
solids, sand or dirt can create deposits inside the
wall of heat exchanger components, reducing the
amount of heat output. If this condition is suspected,
contact your Central Boiler dealer.
14. Burner not operating properly - See section H and/
or troubleshoot burner according to manufacturer's
instructions. Ensure the firebox door is closed and
the door switch is operating properly.
B. OUTDOOR FURNACE IS OVERHEATING
1. Air entering through the firebox door or smoke
coming out of the firebox door when the door
is closed - Make sure the firebox door is properly
latched and check the condition of the door rope.
If it is not sealing properly (indicated by a uniform
indentation in the rope), replace the rope. If door
does not close tightly, adjust using the appropriate
procedure (see Owner Serviceable Items).
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