Originally Posted by Jenny cantrell
Thanks for the reply, we did try just the fan and it runs for a few seconds and it kicks off. Then we tried the AC to see if we could get that to kick on, that also didn’t work, along with the heat pump we tried and it didn’t even kick on, does temperature impact the ability for the unit to even kick on at all? I just assumed it would run but wouldn’t be efficient due to the 32 degree temp. I also would think if I set just the fan to high it would work? Thanks again for any help here.
Welcome to the forum. We have a 2020 Berkshire with the same Precision Plex system. If the oustide temp drops below around 40 degrees (haven't been able to determine exactly what the cut off is), any A/C units with heat pumps installed will not run in any mode, including just fan. You should see "Heat Pump Lockout", or something similiar to that, on the LCD panel when the lockout is active. I confirmed this with the Precision Plex folks when our bedroom unit started shutting off in the middle of the night (we usually leave the fan on for white noise).
The Berky has an external temp sensor that trips the lock out for the heat pumps. If your unit doesn't have the external temp sensor, the A/C units will activate momentarily to pull air across the internal temp sensor and determine if the temp is too low to operate - that's likely why yours run for a few seconds and then shuts down.
While I understand the reason for locking out the compressors below a certain temp, the fan lockout is annoying. I prefer to have the air circulation and white noise at night.