Barely a year old and the controller gives error code EEEF1 which causes unit to do weird things like shut off, not regulate temps, and digital read out has internal temp at 32 F when it’s 80+F outside. Ordered circuit board thinking it was inside of control box but learned it is the board located at the bottom of the unit.  Luckily this fixed the problem. Interesting that the circuit board is directly under the heat unit.  Noticed the screws that hold the circuit board were rusted so somehow water, steam, or something got in and damaged it.  Easy to replace. Advise taking picture before disconnect wires to help replace and connect new circuit properly.