The second story of my house is heated and cooled by a heat pump. We had it replaced about four months ago, so this is a brand new Carrier
unit.
The day before yesterday we had an exterminator come in, and they were spraying in the attic, so I shut down the whole ventilation system at the breaker. I left it off for about 8 hours. It was a hot day, so by the afternoon the second floor of the house got up to about 85 degrees.
At 4 o'clock, I turned the breakers back on. The thermostat quickly clicked on and the inside fan started running. But the heat pump just sat there. It didn't come on. By 4:50 I was desperate and called the repair man -- but it's August in Maryland -- goot luck talking to an AC repairman! They didn't call back, and so as bedtime approached, it was still over 80 degrees in the master bedroom.
Then, suddenly, for no apparent reason, the heat pump came on, and the house cooled down quickly to a comfortable temperature. And it's been working fine since then.
So what happened? Why did the thing just sit there for so long? I know they have protective circuitry that stop them from cycling too quickly, or from trying to operate when they frost in them, etc. But none of those things apply here, that I can see; and I didn't think that circuitry would keep it turned off for more than 6 hours.
Anybody know anything about these infernal devices?