The owner called four days before Ramadan. Nothing had failed outright — every unit still switched on, the fans ran, and the remote showed 18°C. That is exactly the pattern that makes people replace equipment they do not need to replace: the system looks alive, so the assumption is that the units are simply “old and weak”. What was actually happening was three separate faults across six units, and only one of them needed a new part.
The theory: why capacity fades instead of failing
A split system moves heat, it does not create cold. The indoor coil absorbs heat from the room and the outdoor coil dumps it outside. Anything that blocks either exchange — dust on fins, a clogged filter, low refrigerant charge — does not stop the machine, it just lowers how much heat it can move per hour. The compressor keeps running, the electricity meter keeps turning, and the room simply never reaches the set point. In Riyadh, where fine sand coats an outdoor coil within weeks, this decay is the default outcome of doing nothing.
What we found, unit by unit
| Unit | Reading taken | Diagnosis | Action |
|---|---|---|---|
| Majlis (2 ton) | ΔT 5°C, suction 42 psi | Low charge + leaking flare joint | Joint re-flared, vacuum, R410a recharge |
| Master bedroom | ΔT 6°C, coil grey with dust | Blocked condenser | Foam wash + pressure rinse |
| Kids room 1 | Ice on suction line | Filter fully blocked | Filter replaced, blower cleaned |
| Kids room 2 | ΔT 7°C | Blocked condenser | Foam wash + drain flush |
| Guest room | Starts hard, high amps | Weak capacitor | Capacitor replaced |
| Kitchen | Water dripping indoors | Drain slope wrong | Drain re-routed and flushed |
Measured result
Vent temperature difference (ΔT) before and after
- Every room reached 22°C within 18 minutes of switching on, from a 45°C afternoon.
- Only one spare part was needed across six units — a capacitor.
- The leaking joint was repaired before recharging, so the refrigerant will not disappear next season.
- The owner moved to a quarterly contract, which schedules the same work before it becomes urgent.
Questions about this case
Can six units really be serviced in one day?
Yes, with two technicians and the common spare parts already on the van. What extends a job to a second day is a compressor replacement or a part that has to be ordered.
Was replacing the units cheaper?
No. The units were five to seven years old and the total repair was a fraction of the price of six new units plus installation. Replacement makes sense from about nine years, or when a compressor fails on an old unit.
How often should a villa like this be serviced?
Every three months for cleaning, with a full pressure and electrical check before summer. Six or more units is the point where a scheduled contract costs less than the emergency visits it prevents.
The same service in your district
AC repair & maintenance is available in Hittin and every Riyadh district.
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