My hubby tried to replace the thermostat, but didn't write down the wiring before he took it off. Does anyone know the wiring for an old Luxaire model PDSV-LD12N080A? The new thermostat is an easy to install Honeywell RTH111, but have no clue how to hook up the wiring now. It has green, red, yellow, white, and blue. He does remember that one of the wires wasn't being used on the old thermostat, possible blue? Any help will be greatly appreciated!

I have a Hamilton natural gas furnace. I've had trouble with the pilot light going out since the begining of winter. It would seem to stay lit better if I took the thermocoupler off, and cleaned it. Well, yesterday, it just wouldn't light no matter what, so I purchased a universal thermocoupler, put it in last night, and it seemed to work great all night, till this morning, woke up to a cold house. I tried to light it again, nothing. What could be wrong now, the valve? Ok, in addition, now I'm trying to warm up, the burner on the oven won't lite, it doesn't have a pilot, burners work fine, I have a gas water heater too, it's working ok, ran hot water till burner lit. Ok, so now I turned off the breaker for the furnace, and the stove for about 5 minutes, turned em back on and the pilot lite for the furnace lit, and the oven burner lit. After this, I went out to the gas meter, and I turned the valve going into the meter, another whole turn counterclockwise, while furnace, and oven were running. Both were still running when I came in. Doesn't the valve come to a stopping point when it is all the way open? It could still be turned out some more, I didn't go any farther with it, cause I was afraid it would unscrew all the way. What's up?