I spent this morning learning about heat pumps. When I went outside to check on the heat pump after breakfast, there wasn't much snow or ice on it, but the fan blades had several inches of snow on them and there was a bit of snow down inside the case. A rolling stone gathers no moss and a spinning fan blade gathers no snow. So what was going on?
I also noticed that a metal pipe heading into the heat pump had ice on it. Yesterday, I noticed it was warm to the touch. After some research, I learned that heat pumps defrost themselves, sometimes as often as every 30-90 minutes or when ice is detected. I read an HVAC professional recommend turning on the A/C for a half-hour and and see if the heat pump starts to steam from defrosting. Then, if that doesn't do the trick, pouring warm water over it and into the casing to get rid of the snow and clearing the slush that fell underneath. So I tried all that.
No luck.
For several hours the heat pump was making no sounds at all. Then I thought I'd check the circuit breakers. Everything was fine. So I decided to flip the HVAC breakers anyway. After a few minutes I heard sounds coming from the heat pump. Not long after, the fan kicked on.