SF1000E Operator Manual | 1.2021

Troubleshooting 1. Problem: Circulation blower runs constantly. NOTE: Make sure the white button on the fan limit control is pulled out and in the “auto” position.

Possible Causes:


• Pull white button out into the “AUTO” position.

• Fan limit control is in “TEST” mode: white button is pushed in.

• “OFF”setting on fan limit control is low.

• Remove cover on fan limit control and check for the proper setting. The point indicators should be set at 100°F “OFF” and 150°F “ON.” Do NOT attempt to adjust the temperature indicators on the dial. • Check by moving the “ON” and “OFF” point indicator to a temperature position where blower should turn off. If the blower continues to run, replace the fan limit control. • Review wiring diagram. If unit is wired correctly, seek professional assistance.

• Defective fan limit control.

• Improper wiring.

2. Problem: Circulation blower vibrates during operation.

Possible Causes:


• Set screw on squirrel cage is not tight.

• You may attempt to adjust the weights yourself to obtain an acceptable balance. If you are unsuccessful, contact your supplier. • Check squirrel cage alignment and position so that it does not drag on the housing during rotation, then tighten the screw sufficiently to fasten the squirrel cage securely to the shaft.

• Balance weights on squirrel cage have become dislocated.

• Dirt and debris on blower.

• After the unit is cold, inspect the blower housing and clean as needed.

3. Problem: Flames discharging from fuel door during reloading.

Possible Causes:


• Insufficient natural draft or an obstruction in the flue system • Fire chamber filled to capacity with unburned fuel. • Opening the door has provided additional oxygen which has ignited the accumulated gases from partially spent fuel.

• Always open the door cautiously and allow the safety latch system to perform its designed function, containing gases within the fire chambe .

• See Troubleshooting Problems #6 and #9.

• Do not attempt to overload the furnace.


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