Heat Pumps and Electric Heating - Heat Pump blows warm on COLD setting

I have a York Heat Pump, model E2EB024A06A that on the Cold setting will blow cool for the first few minutes, not cold, just cool and then start blowing warm to hot air. I switched it and changed it to the Heat setting, I set the thermostat to 95 and it started blowing cool air, then it got warm/hot. The outside unit was blowing cold air. The fan was on at the top and the sides were cool/cold to the touch.

I'm not sure how old it is. It worked ok last year. It wasn't terribly cold last year, but it was our first time using it since we had just bought the house. I know the wall thermostat is wired right since it worked fine last year. We just started using fan to circulate air and now that its gotten really hot, we decided to turn on the cooling.

Calling out all the guru's. I'm handy and can figure things out, but not this. Anyone have an ideas, where to start checking? I don't know much about heat pumps but if you can give me step by step instructions, I can definitely try some troubleshooting.

Thanks so much

Either someone has mis-wired the thermostat, or the reversing valve has packed it's bags and left.

Most units I deal with will engage the reversing valve to cool, some engage the reversing valve to heat.

Determine what your valve needs to do in order to cool, and if it needs to engage the reversing valve to cool then you should have 24VAC at the reversing valve.

Or if the T/Stat was not programmed right it will cool in heat setting and heat in cool setting.
If yours heat's in both setting I would say the reversing valve solenoid is fried.
This, of course, assumes that the compressor is functional.

Thanks so much TOHeating. I'll check both out, the value and compressor. I dont think its the thermostat wiring, as it worked last year. I was replaced with a new one last year, but when we used it last year, hot was hot and cold was cold.

By default your York will heat if the O terminal (and eventually reversing valve) is not energized from the tstat. Start by checking the reversing valve.