Troubleshooting guide

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finishes the rotation by sending power through the purple wire back to the gearmotor
until the switch drops in the notch again. In this example however Switch #2 is not
adjusted properly and the switch does not open while on the edge of the disc as it rotates
through and drops back into the notch.
The Control Board does not detect Switch #2 opening when it should. At this point the
Control Board immediately goes into #4 Alarm. The difference is the Lights that
normally come on during Start-Up do not come on and the unit will not start feeding
pellets before going into #4 Alarm.
Notice the timing in Example 2: Once the pot starts to rotate, the board does not detect
Switch #2 open. This takes approximately 7.5 seconds. The lights that normally come on,
fail to come on and the unit does not start feeding pellets. At this point the unit
immediately goes into a #4 Alarm. Total time approximately 7.5 seconds .
How adjust the Switches.
Starting with the introduction of the
Lincoln SCR the bracket for the #2 Switch
will have slots for adjusting the bracket
left to right if needed. This adjusts the
timing of the switch. The #2 Switch
should drop in the notch a fraction of a
second before switch #1.
Figure 15
Both brackets currently have the slot to adjust the switches closer to the disc, if needed, to
make better contact. Simply loosen the screw and slide the switch closer to the disc.
Remember to tighten the screw when finished adjusting the switch.
Troubleshooting Flow Charts for the SCF-Revolution
Fan/Limit Control - Please see Figure 6 on page 6 for more information
regarding adjusting or replacing the Fan/Limit Control.
The Fan/Limit Control shuts the furnace down in an Over-Temp situation. This usually
involves the room air fan. The fan may be defective or the fan may need cleaning. If the
squirrel cage becomes dirty, they can’t move enough air to keep the furnace cool enough
when running on the higher settings. If the High Limit trips more than once a closer look
should be given to Convection Blower of the furnace. The Fan/Limit Control may
actually be causing the problem if it is not controlling the fan correctly. The control is
adjustable and the settings should be looked at when troubleshooting this area. Setting the
Limit setting too low could cause the unit to shut down at the incorrect temperature.