Furnace | Blower-Vac

Amana Gas Furnace. Furnace blower appears to work, but no heat. 3 Blinking red lights. I googled this, someone said 3 lights can mean:
1. The exterior vent pipe is blocked.
2. The pressure switch is bad or wired wrong
3. The ventor is clogged or jammed.
Attempted some cleaning with shop vac to see if there was an obstruction. When shop vac was stuck into exhaust vent pipe, the furnace kicks on. As soon as I take it out, it shuts off. Not sure what the problem is, but I would like it resolved today if I can possibly do it.
If not, I'll call a pro, but since I'll be calling out of the phone book, I want to minimize the chance of being ripped off by at least seeming knowledgeable.
Thanks.

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Tagged as: Amana, Blinks, Furnace, Heat, Light, Times, Works 4 Comments

10Nov/094

Furnace Does Not Run At All / Cold!!!!!?

I have a Hamilton Home Produts/Hamilton Furnace and it will not run at all. I changed the thermostat,leveled it no good. Last year I changed the Flame sensor last year.What it was doing was the house would be at 60 degreese and I would set the thermostat at 70 and it would start up run about 4-5 minutes and then shut down and in about 4-5 minutes it would start up again and the thermostat was ingaged all this time. Now it will not start up at all. The thermostat is set at 70 and it was about 30-35 in the house and it did not start up.I cleaned the Flame sensor off, Cleaned out the ducts,cleaned out the furnace inside with a shop vac. Cleaned out the vent blower. Last night we got home and the furnace was off and it was very cold in the house, at least 30 degreese,I went downstairs and turned off the furnace and then turned it back on and it went on for 4-5 minutes then shut down.In 4-5 minutes it started back up again.4-5 minutes down again. Now it will not start at all. Help please.