I have an Amana Air Comand Gas furnace/AC, it's 4

it should be above the burner on the outside of the heat exchanger square is shape

Gas Furnace

If you are looking for a high efficiency furnace with up to 96% efficiency then Amana AMH95 forced air gas furnace is a considerable furnace for you home heating requirements.
- See more at: http://www.cleanairheat.ca/amana-amh95-gas-furnace.php#sthash.FeFfEH9f.dpuf

bad gas valve or control board

This is a small furnace is your home about 1,000 sf? If your home is a 2000 sf home it may be too small and therefore low air flow. Otherwise you can try putting high speed black wire to heat on the circuit board. Or you have a main duct down somewhere.

Hello,1st check that the gas valve is on (the knob on top).2nd check that the gas handle is open in the gas pipe next to the unit.3rd was any work performed on the gas service (new gas stove,clothes dryer,hot waterheater,fireplace) there might be air in the gas pipe that has to be purged out.It is safe to reset the unit and let it attempt to light 3 trys.(turn the power switch on/off) untill the air is out.Listen for a "click" from the gas valve thats is when the gas is on.It is a fuel supply problem,is the gas to the house turned on?any street digging in front of the house by others?Your utility company can check.

In the path of the flame on the last burner that starts, there will be a small rod. That rod is the flame sensor. Take a scrub pad and polish it. Also check the electrical connection that goes back to the circuit board. Disconnect any ground wire from the circuit board to furnace cabinet, sand it and replace it.

That would only really happen due to one of two things.

A bad thermostat.

A stuck relay. If the relay to the AC is stuck closed then it would come on whenever power goes through to the furnace.
This would be rare because very few units had that type of setup.

You can verify the T-stat by removinf the tsat from the wall. disconnect the red, white and yellow wires. Touch red to white.

If the heat comes on and the AC stays off, then your Tsat is bad.

I believe you are asking which furnace to go with?

Just some clarification first.

The "condensor" is the outdoor unit.
A "Compressor" is the device inside the outdoor unit that pumps and "compresses" the refridgerant.

An evaporator is the indoor coil, it has refridgerant running through it.

The furnace is completely seperat from the condensor and evaporator.

I "THINK" you are saying that you are looking to buy an AMANA system with a 5 ton 14 to 16 SEER condensor, and a furnace, but you need suggestions on the furnace.

typically when you purchace a condensor, the evaporator coil is simply matched by the manufacturer to the specific condensor you purchace, there is no choosing to deal with. All condensors ofcourse come with a compressor already installed.

If my assumption about your request is correct, maybe this will help.

Amana's 90+ furnaces are great units. I would recomend them to anyone. The 80+ uses a somewhat inferior heat exchanger, and is ofcourse less efficient.
Anything higher than a 90+ can take quite a while to recoup the costs of the enitial purchace through your efficiency savings.

If it were my home, I would go with the 90+ furnace, and the 16 SEER Condensor/evaporator system. But ultimatly, its up to you, your efficiency standards and your wallets potential.

If you live in a northern state where AC is little needed, I'd go with the 14 SEER AC.
Again, an initial cost verses long term savings issue.

Hello Bob,
Welcome to fixya,

You said, Amana Air Command 80, 20 years old.
Electronic ignition.
Furnace does not start.
Good power to furnace.
Thermostat properly set.
Where do I start looking?

Sounds like you possibly have one or more bad jets if the unit is a gas furnace!
Let me know how it goes.
Huuum

WOW, listen to this story!
I understand you are looking for the solution to fix your furnace your self.
But I want to tell you my story about my smart wife and our furnace.
When we moved into this house the furnace was 20 years old and she suggested that we put a new one that it will save us money.
I laughed at her and replied if it's not broken why fix it!
Six years later it finally broke down and I replaced the whole furnace and central air unit with a new one.
Our utility bill went down $100 dollars a month!
That's $7200. that I lost over 6 years due to not respecting my wife's power of reasoning!
If you can afford it or can get financing replace any unit 20 years old and it will pay for it self.
Can you imaging $1200. a year for 20 years is $24,000 dollars I'm saving with a new and efficient unit.
Do the math!!!!!!!!!

Thank You,
Huuum, Hope I gave you some good fatherly advice.
Please remember to leave a rating