American Standard Heating & Cooling - Recent Questions, Troubleshooting & Support

How old is the unit? Heat pumps don't work when it's real cold, you know it's limits. If it's not real cold outside, then it may be low on gas or such and need a service call.

I don't know, I don't have a red, white and green! :>D This seems to be an American Standard package unit? https://www.google.com/search?q=American+Standard+package+unit All question need full 'make model (what it is)' as the first three words and then a clear concise question of what the problem is and what you might have tried.

There is a sensor in the furnace that tests to be sure the vent pipe that takes the exhaust out is clear, I had a furnace a few yrs ago where that sensor failed and it wouldn't light, it could call for heat but nothing would happen

Had error code 91 on Trane XL19i thermostat. Heat season on duel fuel system. Repair tech said board is bad ($963) and transducer ($1000). Unit is 3 ton 12 years old. Does it make sense to repair or put in a new unit?

Out of fuel or burners need ajust

High and low voltage AT the motor with no motor function is a bad motor. Should have 12 to 13 volts DC on r+ and r- (I believe are the correct terminals) You must test this when the machine is trying to run. Yes, it's dangerous, hire a licensed contractor!!

check pressure switch

low pressure fault, you need service

http://www.denverwinair.com/literature/american_standard/thermostat/acont802_install_guide.pdf

low pressure cut out. refrigerant leak

american standard error of 156... on a car? If PO0156, thats an ODB2 sensor... possibly the second O2 sensor on your emission system. You can reset the code and see if within 100 miles it lights back up... Likely it will. You may have a burned out catalytic converter... or a bad O2 sensor... or a blown head gasket, or many other things. If that is the ONLY code I would go forward with the O2 sensor. Look it up on ebay, year, make and model of car. Typically if one o2 goes, the other will follow. It is symptomatic of the cat going out though. How many miles on the car? More than 150,000? Likely its the catalytic converter. They are a consumable in your car. It will affect your mileage significantly while the code is on, and typically if it is the o2 sensor itself that has gone bad ( between 30 and 100$ per) and the cat is ok, if you don't fix the o2 sensor, the cat will burn up (cost between 200 and 700, and a bunch to swap out) Get it checked out, you're looking at more bucks the longer you wait

are you running a schedule? try the permanent hold!!

you have a heat pump with 1 stage auxiliary heat with 1 stage of cooling. wire the same way

Google tcont800 installation manual. option530 should be 0 not 1. Press system button, 2 and 4 square hold until screen changes, option 530 --0

Could be a number of things:
Could be as simple as having bad batteries in your thermostat “ if applicable” some thermostats do not have batteries.

Could have a programming error “ this could happen from a power surge or outage. In this case the thermostat would need to be reprogrammed.
Could have a bad thermostat.

Could have a short on the heat pump itself.

Could possibly be none of the above, though I would trouble shoot in this order.

After checking batteries and programming I would suggest contacting a trained HVAC technician to further diagnose the issue.

Your question makes no sense. You dont have a heat pump with ONLY emergency heat. Is it working or not???

https://www.americanstandardair.com/owner-support/symptom-checker.html

This lights blinks a sort of Morse code, a number that corresponds to a chart located somewhere on the furnace. It's usually on the doors that you remove from the front. For example, a "dot...dot...pause...dot...dot...pause" would be the number 2, which the chart may say indicates something like "ignition failure" or "pressure switch open."

Would need more info, which door are you talking about? Blower door with power switch? At what point in the firing sequence does the unit fail? So the burners ignite?