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WOODMASTER OUTDOOR FURNACES • OWNER'S MANUAL
12. 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 WoodMaster dealer.
13. Check Fan Draft and Draft Flapper - Make sure they are operating
properly.
14. Check Fan Switch on ETC to be sure it is ON - Fan Switch should only
be off while filling or cleaning.
15. If water temperature is reading 120˚F or lower - push Set Button on
ETC System to restart Heating Mode.
B . OUTDOOR FURNACE IS OVERHEATING
1. Air entering through the door - Make sure the firebox door is properly
latched and check the condition of the door rope. This is the fire-
resistant gasket around the firebox door. Make sure the door has a tight
seal.
2. Check air intake on firebox door - Make sure cover closes tight.
NOTE: If the water in the outdoor furnace boils, air can enter the lines and could damage the pump.
Be sure to remove air from system (see Filling with Water section). A hissing sound coming from a
pump, in most cases, means there is air in the system. Check water level to ensure that your furnace
is full.
3. Water is not circulating - The pump should run continuously and water
needs to circulate continuously through the supply and return lines to
keep water temperature uniform in the outdoor furnace.
4. Circulation valve(s) closed - Be sure the proper valves in the system
are open to allow circulation.
5. In extremely warm weather - a smaller amount of wood should be
used.
6. Check auger head for air leaks and that the ash auger head discharge
door is closed.
D . FREQUENT PUMP TROUBLE OR POOR WATER CIRCULATION
1. Pump mounted incorrectly - Pump must be mounted on the back of the
furnace. See Mounting the Pump section.
2. Deposits in water lines/heat exchanger walls - If water high in silica or
other mineral content has been used, material deposits may build up
on the insides of the supply and return lines and on the heat exchanger
walls. If this occurs, the system will need to be drained and then
cleaned using Sludge Conditioner (p/n 166). The system must then be
refilled with the proper amount of corrosion inhibitor and fresh water.
3. Water will not circulate - If the system has been drained and refilled,
or if the system has been opened for any reason (e.g., replacement of
pump, adding heat exchangers, repairing a leak), the system must be
purged (see Initial Start-up Procedures).
