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ErrBase

Hisense Air Conditioner Not Cooling: Parts and Fixes

Quick Answer

If your Hisense AC is blowing warm air, the most common culprit is a clogged air filter or dirty condenser coils choking the system. Check your filters first, then ensure the outdoor unit is not blocked by debris. If the fan runs but the air stays warm, the run capacitor has likely failed and needs replacement.

Look, nine times out of ten when I show up to a not-cooling call it's something simple. Dirty filter, dead capacitor, maybe a thermistor that gave up. But here's the thing: if you keep running the unit through a cooling failure, you'll overheat the compressor and turn a $25 fix into a $400 one. Don't let that happen.

HisenseAirconditionerSeverity: highDifficulty: intermediate85% DIY Success
Time to Fix
20–90 min
Difficulty
intermediate
Parts Cost
$12 – $160
Tools Needed
Phillips #2 screwdriver, Multimeter with capacitance (MFD) mode

Hisense Air Conditioner Not Cooling: Parts and Fixes

Before you call a pro, know that roughly 70% of not-cooling calls are maintenance or a single cheap part, not a dead compressor. I replaced three capacitors on Hisense window units just last week and each job was under an hour. Start with the basics: airflow, thermostat settings, power. A capacitor or sensor replacement is usually under $30 in parts.

Most Likely Causes

Based on aggregated repair data, here is the probability breakdown for this error code:

Clogged or dirty air filters35%
Faulty run capacitor25%
Dirty condenser or evaporator coils15%
Malfunctioning thermistor10%
Failed fan motor10%
Refrigerant leak5%

Symptoms You May Notice

  • Fan runs and air comes out but it's the same temperature as your living room, no matter how low you crank the thermostat
  • You hear a loud hum from the back of the unit for 3-5 seconds and then it clicks off without the compressor ever catching
  • Solid sheet of frost covering the evaporator fins behind the filter, sometimes thick enough to completely block airflow
  • Unit cycles on and off every 4-5 minutes like it can't make up its mind
  • Fan blade barely turning or making a grinding noise, kind of like a playing card in a bike spoke

Can you reset a Hisense airconditioner to clear the NOT-COOLING code?

Unplug the unit from the wall and leave it for at least three minutes. Don't cheat on that wait time. While it's unplugged, press and hold the power button on the unit itself for 5 seconds. Plug it back in, grab the remote, and set it straight to Cool at the lowest temp. Wait 3-5 minutes. You should hear the compressor click on within that window. If it still won't cool after the reset, you've got an actual hardware problem and diagnostics are the next step.

Tools Required for Diagnosis

Phillips #2 screwdriverMultimeter with capacitance (MFD) modeInsulated screwdriver for discharging capacitorFin comb for straightening coilsNeedle-nose pliersFlashlight or headlampSoft brush or vacuum with brush attachment

Diagnostic Checklist

Follow these steps in order. We start with the easiest external fixes before opening up the machine.

ComponentComponent Under Test
Expected Range15–60 uF
ConditionIf Open (OL) or infinite, replace component.

Replacement Parts

If your diagnostic testing proves the component has failed, you will need a replacement. We recommend OEM parts over aftermarket for water-handling components.

Part Name
Run Capacitor1065422 · $22–$48
Air Filter1121005 · $15–$35
Temperature Sensor (Thermistor)1135201 · $12–$28
Fan Motor1102558 · $85–$160

Frequently Asked Questions

Where can I find my Hisense air conditioner model number?
On window units it's usually on a silver sticker on the right side of the cabinet. For portable units, check the back near the exhaust hose or the side panel. Sometimes it's on the inside of the front cover too. You'll need this to order the right parts, because a capacitor that fits an AP1019 might not fit an AW0821, and the last thing you want is to wait a week for a part that's the wrong one.
Why is my Hisense AC blowing air but not cooling?
The fan's running but the compressor's not engaging. Most likely causes are a dirty filter that's frozen the coils, a dead run capacitor, or a thermistor that's gone bad. Start with the filter, it's free to fix and it's the culprit way more often than people expect. If that's clean, listen for a humming from the compressor. A hum without startup almost always means a bad capacitor, and that's a $15-25 part you can swap yourself.
How often should I clean the filters on my Hisense unit?
Every two weeks during peak summer. Not once a month, every two weeks. If you've got pets or live somewhere dusty, maybe every week honestly. I've pulled filters after three weeks of operation that were completely blocked, solid with dust and hair. A clogged filter will freeze your coils and stress the compressor way faster than normal wear would, and you'll end up with a real repair instead of a free rinse and dry.
Is it worth repairing a Hisense portable AC that's 5 years old?
Depends what's broken. A capacitor, sensor, or fan motor? Yes, absolutely, those are cheap parts and the repair's simple. But if the compressor's seized or there's a refrigerant leak in the sealed system, repair costs usually get close to or exceed a new unit. A new Hisense window unit runs $250-350, so if you're staring at a $300 compressor job on a five-year-old machine, just buy new and get a fresh warranty.
Can I recharge the refrigerant on my Hisense AC myself?
Technically no, and practically you shouldn't. Refrigerant work requires an EPA Section 608 certification and you can't legally buy refrigerant without it. Beyond the legal stuff, adding refrigerant to a leaking system without finding and fixing the leak is just pouring money out. The charge will drop again next season. If you suspect low refrigerant, call an HVAC tech who can pressure-test the system, find the leak, repair it, and recharge it properly.

Models Known to Experience NOT-COOLING Errors

This repair applies to most Hisense airconditioners with this error code. Common model numbers include:

AP1019CR1G, AP1219CR1W, AW0821CW1W, AW1221CW1W, AP0822CW1W, AP1419CW1G

RP

Written by

Raj Patel

HVAC & Water Systems Specialist · 15 years experience

Last verified for technical accuracy on May 20, 2024