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Even after replacing thermostat and motherboard offered from company, my heater would trigger e3 error code and shut off. After several (maybe 100!) different attempts to plug in and operate, here is what worked for me!
Depress the power button on the heater while plugging in to wall circuit. Continuously depress power button. It will run through a test cycle and attempt to start. Keep depressing the power button as the heater tries to start, then shuts down with e3 error. While the power button is still depressed, unplug the unit from the wall. When I plug back in the wall the E3 error is gone. Good luck
This might be a couple things M's Jackie. 1 the reversing valve is stuck or bad,2 the swtch is broken , Is this a heat pump. Meaning you use it to both heat and cool the home? There is not gas connected to this unit?
take your chellphone and open the camera,then take the control and push any button in front of the chellphone.if the remote is ok you see a light blinking.if you didnt see the light the eye of the small plate have the problem.
I had the same problem. Check the remote control section of the manual. When you change batteries the screen flashes the hot and cold icons alternating. press a utton when the hot one is on and it will activate the heat+cool mode.