American Standard Heating & Cooling - Page 9 - Recent Questions, Troubleshooting & Support

Possible bad fan or it is not being turned on---time for a tech to look before it gets worse.

That is normal. Secondary heat is not needed unless it is very cold outside. If the heat pump can't keep the house warm enough and the temps start to drop, the secondary heat kicks in. 2 degrees is normal.

If you are handy with meters and electrical work try this.Somewhere there is a small transformer that supplies the 24volts.If you trace the wires from the contactor coil back to the big circuit board then the transformer is probably on that board. Make sure you are tracing the COIL wires. If the wires go to a small transformer mounted separately then your in luck. That transformer steps down the voltage to 24 volts used as a "control" voltage for the unit. If you have 24vac output at the transformer, and no 24vac at the contactor then a control or thermostat circuit is open.

Hello, the low voltage fuse will blow if the thermostat wires are shorting togethur or ground, or if the contactor coil on the outside unit is shorting to ground.

All that in most areas (alum wires) is not accepted for the reasons you have---Best thing here is not use it as risk of fire is there--consider having it replaced--not cheap but cheaper than a house catching on fire.

You have power coming into the contacts, but will the contacts pull in? If not and I'd asmune they aren't, with unit on and thermostat calling for cool do you have 24 volts on the coil side of contact. That will be where a small wire will connect on each side. If you carefully pust in on contacts and the unit will run, more than likely the coil is bad and will need to replace complete contactor. Look for a broken wire from air handler to the outside unit. It will be 2 thermostat wires in a brown sheave.

Yes, this button can be repainted in the color of your choice. Was that your question?

Bad fan motor.

Sounds like the fan motor is shot!