u/the_chosen_o1ne

Hey everyone,

I have a Hisense portable AC with the exhaust hose that goes out the window (not sure of the exact model). About 2 weeks ago the display on top started showing “E5” instead of the temperature. I Googled it and it said to drain the unit because the water container was full.

I unscrewed the drain plug on the back with a screwdriver, drained a bunch of water into a bowl (there was definitely water sitting at the bottom inside), made sure it was all out, screwed everything back in place, and double-checked that all parts were secure.

After that, I turned it back on and now it keeps turning off by itself after a short time. The thermostat/display acts weird (“tweaking”) and it just shuts down. This never happened before I drained it.

A couple other things:
• I left the back filter off thinking it would help with airflow (“cooling system wide open”).
• No other error codes showing now, just random shutoffs.

Did I do the draining process wrong? Could the float switch/sensor be stuck? Is leaving the filter off making it worse (maybe causing overheating or bad readings)? Or did draining it somehow cause a different issue?

Any troubleshooting tips, common fixes for this, or things I should try would be really appreciated. I’m in an apartment in a hot area and this thing was working great until now.

Thanks in advance!

Side note: It will beep twice before turning off. Right now it’s running fine but in about 10 more minutes.. never mind as I’m typing this out it turned off again.