SORRY, the electronics is my weak area, I said all that backwards. The switch is operating properly for a normally closed circuit. It's a complete circuit and opens if it senses hi temp. Nothing wrong at the switch, nothing wrong at the board.Smokey, Thank you for your time and thoughtful reply. It is the 2 & 3 lights together, see cut and paste message from manual:
"The Diagnostic Lights flash as follows:
...
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 #2 and #3
LED lights will flash simultaneously. (See
Figure 2 on Page 5 and point 4 on page 16)" from page 7 of the manual I downloaded for St. Croix Afton Bay Operation and Maintenance.
The hopper is full of fuel. I spent a good 2-3 hours cleaning the stoves hard to reach areas. cleared the vacuum tube. By passed the vacuum switch with a jumper (which should work if the switch was bad because it is a normally open switch) The voltage to the switch is correct, 5 V one side only at the control board pins.
Because the stove goes into safety shut down in 45 to 75 seconds, I don't think the proof of fire switch should have been polled yet.
I have rechecked the high limit switch and I think it is a problem between the switch and the control board. The high limit switch is a normally closed switch and at the control board only one pin to the switch should have voltage (line voltage). At the switch only one wire has voltage (120V) when they are not connected to the switch. But when connected the circuit completes. I hit the reset button on the switch but it won't reset to a closed position. So I have a bad high limit switch, one problem identified. What I don't understand is why I can't get the stove to light when I try to bypass the switch. Because it is a normally closed switch I thought if I disconnect it the board would sense it as a operational closed switch - didn't work, same error message. Then I tried to light to light it while holding the reset button during startup (which does close the switch, I kept a voltmeter on it) still didn't work.
I'm ordering a new switch, I wonder if there is another problem.