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Diagnostic Features of the Control Board
The #2 LED, #3 LED and #4 LED lights on the LED Light bar (See figure 17) will flash
to give a diagnostic code to help in diagnosing problems that may occur.
These conditions fall into 2 categories:
a.
Heat related issues.
b.
Vacuum related issues.
The Diagnostic Lights flash as follows:
1. The Proof of Fire switch. This switch will sense the temperature of the Exhaust
rising during start up. If the Exhaust temperature does not reach 110 degrees F, or
if, during use, the temperature drops below 110 degrees F, the Furnace will go
into "Internal Alarm" and the Auger will quit feeding fuel. Once the Furnace
completes the safety shutdown, the #3 LED will start blinking. (See Figure 17 on
Page 29)
2. The High Limit switch. This sensor will sense if the unit reaches temperatures
that are too high for normal operation. If this happens the Auger will quit feeding
and the #4 LED light will start blinking. (See Figure 17 on Page 29)
3. The Vacuum switch. For the Furnace to operate correctly the firebox needs to be
sealed. During the first 30 seconds after the Furnace has been turned on the
control board will check to see if the switch senses negative pressure (Vacuum) in
the firebox of the Furnace. If there is no negative pressure, the Furnace will go
into "Safety shutdown" and the #2 LED will start blinking. (See Figure 17 on
Page 29)
"Internal Alarm" - When the control board becomes unresponsive, the control board is
in Internal Alarm. The control board has sensed one of the Safety sensors. This may
cause the furnace to go out. In some cases, after waiting approximately 45 seconds the
furnace will start responding to the control board again. Many times, the cause of this is a
change in the vacuum inside the Furnace. This may be caused by excessive wind or by
opening the Firebox door. The control board will monitor the vacuum switch and resume
normal operation if the vacuum returns to normal.
"Power Reset" - If the board becomes unresponsive for a long period of time, you must
unplug the Furnace, wait 10 seconds and plug the Furnace back in to reset the board.
SCF-Revolution Manual
38
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