The short version
- Symptom
- On and blowing air, room stays warm
- Likely cause
- Dust in the filter or outdoor unit, a capacitor, or a refrigerant leak
- Who fixes it?
- You first, then a technician
Before you start: safety first
Switch the AC off at the breaker before you open the front panel or touch the filter. Don’t open any cover on the outdoor unit, don’t spray water on its electrical parts, and never try to add refrigerant yourself.
Three simple things to check first
- Mode and temperature
Make sure the remote is on Cool (the snowflake), not Fan, Dry or Auto. Set it to 22°C, close doors and windows, and give it fifteen minutes before you judge. If the indoor display shows an error code or a blinking light, photograph it — it shortens the diagnosis.
You can check it - The filter
Open the front panel and slide the filter out. If there’s a grey layer of dust, rinse it in lukewarm water without harsh cleaners, dry it in the shade, not in the sun, and make sure it’s fully dry before refitting. Riyadh dust clogs filters faster than you’d expect, and a clogged filter alone cuts cooling noticeably.
You can check it - Where the outdoor unit sits
It needs clear space around it so hot air can leave freely. If things are stacked in front of it, it’s boxed into a closed corner, or a cover is trapping the heat, clear it. Washing the outdoor unit’s coil (the metal grille the hot air comes out of) is a technician’s job.
You can check it
5 signs that point to the cause
If those three checks didn’t fix it, run the AC on Cool and, after a few minutes, watch the outdoor unit from a safe spot. If it’s mounted outside a window or somewhere you can’t reach safely, don’t lean out or climb to see it. What you see and hear narrows it down:
-
The outdoor fan isn’t turning, or you hear a hum and then it cuts out
Likely cause: The capacitor or the outdoor fan motor; on inverter units it can also be the outdoor control board
Needs a technician -
The outdoor fan turns, but there’s no compressor sound and the air inside is room temperature
Likely cause: The compressor isn’t starting: a capacitor, a relay, or thermal protection has cut it out; on inverter units, usually the control board
Needs a technician -
Ice or frost on the pipes or the indoor coil
Likely cause: Too little air passing (filter or indoor fan), or low refrigerant from a leak
You first, then a technician -
Cools in the morning and at night, weakens at midday
Likely cause: The outdoor unit can’t reject heat: dust on the outdoor coil, or direct sun in a closed space
You first, then a technician -
Runs for a few minutes, cuts out, then starts again
Likely cause: High-temperature or pressure protection, a temperature sensor, and sometimes a blocked outdoor unit
Needs a technician
If you see ice: switch off Cool and run the AC on Fan until the ice has melted and dried, with a towel under the indoor unit because the melt water can overflow. Don’t chip it off by hand or with a tool — the ice is a sign, not the problem.
Stop and call a technician if: the breaker trips every time the AC starts (don’t keep resetting it), you smell burning, you see sparks or scorch marks at the connections, or there are oily stains on the pipes (usually a leak). A capacitor holds an electrical charge even after the power is off, so don’t open or touch it — that’s a technician’s job.
Why we don’t start with a gas refill
Refrigerant circulates in a sealed circuit; the AC doesn’t use it up over time. If it’s low, either there’s a leak or it was undercharged when it was installed. Refilling without finding and fixing a leak means it drops again and you pay twice. That’s why a proper check starts with measuring pressure and testing for leaks, not with a refill.
Riyadh heat exposes any weakness
An AC cools your home by pushing heat out through the outdoor unit, and the hotter the air outside, the harder that job gets. When the outdoor unit is coated in dust or boxed into a closed space, the weakness shows first at midday. That’s why cleaning the outdoor unit before summer takes load off the AC at the peak of the heat.
What a technician checks
| Check | Why |
|---|---|
| Capacitor and outdoor fan | A common reason the outdoor unit stops in the heat |
| Compressor start and electrical current | Tells an electrical fault from a compressor fault |
| Refrigerant pressure and leak test | Refilling without fixing the leak doesn’t last |
| Indoor and outdoor coils | Dust insulates the coils and blocks heat exchange |
| Control board and sensor | A faulty sensor stops cooling too early |
Tried the checks and it still isn’t cooling?
Send us the AC type and the sign you noticed — a photo of the outdoor unit helps — and we’ll get back to you to agree the next step. We never start a repair without your approval.
Common questions
What should I do if my AC isn’t cooling?
Start simple: make sure it’s on Cool, clean the filter, and check the outdoor unit has space and air is leaving it. If that doesn’t help, watch the outdoor unit: is the fan turning, is there ice on the pipes? Those signs tell you whether it needs a technician.
The compressor is running but the AC isn’t cooling. Why?
Usually low refrigerant from a leak, an outdoor coil clogged with dust so heat can’t leave, or too little air passing over the indoor unit. A technician measures pressure and finds the leak before any refill.
Why does my AC only blow air without cooling?
Either the mode is set to Fan or Dry, or the outdoor unit hasn’t started. If the mode is right and the outdoor unit is silent, the cause is usually electrical, such as the capacitor — a technician’s job.
Does an AC need gas every summer?
No. Refrigerant sits in a sealed circuit and doesn’t run down by itself. If the AC needs a refill, there’s usually a leak that has to be found and fixed first.