Every fault below comes from real call-outs across Durban and surrounding areas. Some have a quick check you can try yourself before booking anyone — where that's true, we say so. When a visit is needed, the diagnosis is done with a signal meter, quoted before work starts, and covered by our 12-month workmanship warranty. New to this part? Start with the thermostat, remote & control board component guide.
1. Remote does nothing and the unit will not respond
What you'll see: Pressing buttons produces no beep and no response at the indoor unit, though the remote display itself may still light up.
Why it happens: Flat or corroded batteries, a failed infrared emitter in the remote, or a failed receiver in the indoor unit. The remote showing a display does not mean it is transmitting.
How we fix it: We confirm transmission by viewing the remote emitter through a phone camera, then test the indoor receiver. Where the unit itself is fine, a replacement or universal remote resolves it without any work on the system.
Full remote does nothing and the unit will not respond troubleshooting guide →
2. Unit runs continuously and never reaches the set temperature
What you'll see: The aircon runs without stopping, the room does eventually get cold, but the unit never cycles off, or conversely it stops long before the room is comfortable.
Why it happens: A room or coil temperature sensor that has drifted out of tolerance and is reporting a temperature the system has not actually reached. On inverter systems a control board fault can produce the same behaviour.
How we fix it: We compare sensor resistance against its specification at a known temperature, read any error code the unit is reporting, and replace the sensor where it has drifted. Continuous running is expensive, so this is worth diagnosing early.
Full unit runs continuously and never reaches the set temperature troubleshooting guide →
Symptom doesn't match any of these?
Faults overlap — a "thermostat, remote & control board problem" is sometimes another link in the chain wearing a disguise. Describe what your system is doing on 069 507 6822 (or WhatsApp a photo of the error screen) and we'll tell you which component it actually sounds like, free, before anything is booked.