Air conditioning breakdowns rarely happen at a convenient moment. When your system stops working in a London heatwave, you need an engineer quickly. We offer same-day callout across London and a 24-hour emergency line for urgent repairs.
If a repair is not cost-effective, we can advise on a new installation — often the better investment for systems over 12–15 years old.
Common AC Faults We Fix
| Fault | Likely cause | Fix |
|---|---|---|
| Not cooling (or cooling poorly) | Low refrigerant, dirty filters, faulty compressor | Gas top-up, service, or component replacement |
| Water leaking indoors | Blocked condensate drain, dirty evaporator coil | Drain clear, coil clean |
| Won’t turn on | Electrical fault, tripped isolator, PCB fault | Electrical diagnosis and repair |
| Unusual noise | Fan bearing failure, loose panel, refrigerant issue | Component replacement |
| Ice forming on unit | Low refrigerant, restricted airflow | Gas check, filter clean |
| Error codes on display | Varies by code and brand | Diagnostic visit, targeted repair |
Our Repair Process
Diagnosis
Our engineers carry diagnostic equipment for all major brands — Daikin, Mitsubishi Electric, Fujitsu, Samsung, LG, Panasonic, and others. All our engineers are F-Gas certified.
Transparent Pricing
You receive a clear quote for the repair before any work proceeds. No surprises on the invoice.
When Replacement Makes More Sense
If a system is more than 12–15 years old and requires a major component replacement, a new domestic installation or commercial installation is often more cost-effective. We will advise honestly. See our cost guide to understand what a new installation involves.
Preventing Future Breakdowns
Most AC faults are preventable with regular annual servicing. A service catches low refrigerant, blocked drains, and dirty coils before they cause a breakdown.
Frequently Asked Questions
How much does an AC repair cost in London?
Minor repairs typically cost £80–£150. Gas recharges cost £150–£300. Major component replacements vary — we quote before proceeding.
Is it worth repairing an old AC unit?
If a system is over 12–15 years old and requires a major repair, a new installation is often the better long-term investment.
Can you repair AC in a listed building?
Yes. Repairs do not require planning permission. For installation in period properties, see our Victorian properties guide.
Book a Repair
Call 020 7870 2333 for same-day or next-day repair bookings. 24hr emergency line available.
Simply Air Conditioning London — F-Gas certified repair and installation since 2009.
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