It shouldn't do that. As per the Manual, the furnace should make 4 attempts to light-off, and if unsuccessful, give you a "6" code followed by a "1" code (6+1).
You can always run some tape across that door switch while testing. Or, unplug them from the back and jump them out (after turning off the power, of course!).
From the Manual:
Heating Request with Gas Shut Off:
24 VAC signals applied to W1 terminal of FCB.
The FCB will attempt 4 cycles for ignition then go to soft lockout for 3 hours, and then try for
ignition again as long as the heat call remains. Power reset will clear lockout.
• Inducer motor turns on at high speed.
• Following a 15 second prepurge delay after the low pressure switch closes, the ignitor begins
warm up.
• The ignitor glows red−hot for 22 seconds, then turns off. The FCB flashes error code 6.
• The ignitor stays off for 17 seconds, then begins to warm up again.
• The ignitor glows red hot for 22 seconds then turns off. The FCB continues flashing error code
6.
• The ignitor stays off for 17 seconds, then begins to warm up again.
• The ignitor glows red hot for 22 seconds then turns off. The FCB continues flashing error code
6.
• The ignitor stays off for 17 seconds, then begins to warm up again.
• The ignitor glows red hot for 22 seconds then turns off. The FCB proceeds to soft lockout.
Stops flashing error code 6, and begins flashing error code 6 + 1.
