Stage 2 is on the screen but no heat will come on. American standard thermostat. A/c comes right on but when heat is turned on "stage2" comes up on the screen but the heat won't Not a touch screen.

SOURCE: American Standard Gas furnace acting weird

I am concerned of the readings you have given. 120 volts to ground, but 168 volts to neutral? And having 10 amps of current at the "ventor", but only 1 amp for the whole furnace worries me, because power for the "ventor" comes through the furnace.

You should not have 168 volts to anything! Unless somehow 240 volts is feeding the system, and there is a medium resistance short somewhere.

The controller boards are sensitive to AC polarity (if you will). Neutral should be tied to neutral on the board. You can check that by testing for voltage between the neutral terminal and chassis ground (assuming the chassis is properly grounded.). The hot leg of incoming power, which should be 120 volts, should be connected to the terminal that says 120 VAC.

If your getting 168 volts AC somehow, then something is wrong, and you need to disconnect power from this unit until you find the cause.

As a heat-A/C tech, you should know the sequence of operation for all furnaces is pretty much the same. The boards, while manufactured by different manufacturers, all operate pretty much the same way.

Let me know your findings in reply and I will attempt to help you more.

SOURCE: American Standard blower will not run

Sounds like motor has failed. If the red light is blinking it may be telling you what is wrong by the number of blinks. It maybe locked out for some reason or loose wire. Try turning off breakers to inside unit for 5 mins and try again, this may reset unit. But it sounds like a bad motor or circut board. Try running with stat in on position instead of auto in cooling mode.

SOURCE: no power to thermostat

First you need to make sure you have the right thermostat. It should be a five wire thermostat.
Rh and W or O or B will be heating transformer
in the furnace. To check the transformer in the furnace you have a primary side,across those two wires you should have 115 volts, if you have a gas furnace or 230 volts if you have a air handler with electric heat, then you have a secondary side, which those two wires should be 24 volts. If you have 115 or 230 volts to the primary and nothing at the secondary then that transformer is bad.
Rc and G and Y to the outdoor transformer.
Same principle to the outdoor transformer,
If you have 230 volts to the primary and no volts to the secondary which should be 24 volts, then that transformer is bad.
You have to make sure you are wired correctly because if you get the two transformers together, you will burn one or both of them up.

SOURCE: american standard thru-wall heater air conditioner

sounds as if the heater coil itself is burnt out. These coils may be repaired if you can get an universial coil repair kit and rewire the heater coil yourself. Since the age of the unit is in question I don't know if it is possible to get a kit for repairs but you never know. I would check an a/c supply house for this kit. Good Luck on your repairs

Dave

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SOURCE: I have a ruud achiever 10 model UPKA-018JAZ with

This may be as simple switching the thermostat to electric, under the cover is a gas/electric dip switch. Hope that helps.