Question edited for clarity and add maker.
Try a reset. Disconnect mains power for at least 2 hours. Reconnect and wait 5 minutes before turning on. This resets the mainboard and initiates a self test procedure.
https://www.google.com/search?q=+Haier+CWH24A+not+heating+up
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You will be able to get the answers from Haier support in your country. We are Fixya, not them.
It sounds like a control board fault. You can try a reset. Turn it off at the breaker for 2 hours. Switch it back on and wait 5 minutes before turning the unit back on with the remote.
https://www.google.com/search?q=Haier+Thermocool+AC
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On a Haier Split system a E7 error is a failure of the outdoor inverter PCB and the outdoor power supply PCB. Both will need replacing. Looking around $600 for those parts. Plus fitting. The indoor PCB is very unlikely to be needed.
This website has got to stop letting just anyone answer questions. All 3 of these answers were completely unrelated and not helpful for this person asking the question. They didn't even look up the model number to understand what type of unit this is. I realize it's a very old question, but I'm sure even today there are people giving ignorant answers just as these 3 did.
***back of unit, very bottom, there's a drain hose connection. It's supposed to have a rubber plug in it and a plastic cap screws on over that. Hose isn't necessary to drain, if draining is needed as this unit evaporates the water through the exhaust. But water will build up under certain circumstances. Periodically check and drain by 1. Sit unit on something to elevate it high enough to put a container underneath to catch water. Make sure to sit unit on something very sturdy or take it outside and let it drain out on the ground, it's just water. 2. Remove cap and rubber plug. Water will drain. 3. Replace cap and plug when water stops draining, that is all.
Yes, it must be vented to the outside, even if you're using central AC, too. The reason being is if you don't vent it to the outside, the hot air and humidity that normally goes thru the duct and out the window, will stay in the house and your Central AC will have to run longer and harder to overcome this rise in heat and humidity. In addition, the room that the portable AC is in, will get extremely hot & humid.
Is this reset on the plug? if so its likely bad, bypass and test, if it works get another end or wire to a fused disconnect which would be jn place of, unorthodox, but safe.
It is likely a Haier, not a 'Haiser'.. It is a AC Unit, so shouldn't be in the Category Cars and Trucks. I can change those.
Your answer is twofold;
You need a remote, Google
make model replacement remote
You pressed a button combination set, Google
make model manual
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That error is a freezer fan motor error, Check to see if the unit is defrosting like it is supposed to be. IF it is defrosted, check to see if the motor spins and if you have a meter for measuring resistance, check the motor windings. If they show no conductivity, Replace the fan.
