No steam = no defrost?

by Shawn
(Dayton, OH)

American Standard Model 4A6B3036A1000BB Heat pump (almost 6 yrs old from install date) has started to not emit the steam it used to last year? It's been fairly cold (lows in low single digits in the last week a few nights) but last year would steam regularly during winter.

In addition I looked at thermostat (Emerson) a yesterday morning and noticed a flame and "aux" flashing as well?

Other times the flame flashes but no "aux" shows up during the day or evening time and you can feel the lower heat output difference vs. when the "aux" is showing. I guess the emergency heat is kicking on it seems.

Unit outside still kicks on and blade spins but no ice accumulation at the moment.

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