Air conditioning at work stops working: what's behind it and how to fix it quickly

It's hot outside, the air conditioning has stopped, and ten patients are waiting in the surgery, hotel guests are preparing for bed in their rooms, and lawyers in the law firm are struggling with the heat over files. An air conditioning breakdown in a commercial operation is not a matter of comfort. It is a direct impact on operations and reputation.

Overheating server rooms, guest dissatisfaction, complications for patients, reduced employee productivity, every type of operation has its specific reason why every hour without cooling hurts. That is precisely why emergency air conditioning service requires a different approach than "booking a technician for next week".

This article shows what most commonly causes faults, what you can check yourself and what must be done by a certified technician.

Most common signs of faults and their causes

Air conditioning not cooling or cooling significantly worse

Blocked air filter This is the most common and simplest fault. A neglected filter blocks airflow across the evaporator, cooling drops dramatically even though the compressor runs normally. Cleaning or replacing the filter is part of basic user maintenance and is described in the device manual.

Refrigerant shortage It usually arises from a leak in the refrigerant circuit. Air conditioning cannot simply be "topped up" - any topping up must be preceded by locating and repairing the leak. Under current legislation, work with refrigerants may only be carried out by a person certified for handling F-gases. DIY is illegal here and not covered by insurance.

Clogged evaporator or condenser - Long-term operation without regular maintenance leads to dirt accumulation on the evaporator (indoor unit) or condenser (outdoor unit). Cooling efficiency drops and energy consumption rises. Cleaning these components is part of routine servicing.

Compressor failure This is a serious fault. The compressor is the heart of the refrigerant circuit, without it, cooling ceases entirely. Causes include equipment age, long-term overheating (a result of neglected maintenance) or an electrical fault. Only a technician can diagnose and repair this.

Air conditioning leaking: water inside the room

Water dripping from the indoor unit is the most frequently reported fault. The causes are usually twofold:

Blocked condensate drain - Condensate water forming on the evaporator drains outside via a hose. If the hose is blocked or contaminated, water overflows into the catch tray and then onto the floor or ceiling. Cleaning the drainage system is a standard part of regular maintenance.

Frozen evaporator During defrosting, it produces water faster than the drain can remove it. If your air conditioner is leaking, switch it off immediately and call a technician, condensate water can cause serious damage to equipment and building structures in a short time.

The air conditioner is noisy

Excessive noise is a signal that does not pay to ignore:

• Vibrating or clicking sounds may indicate a loose fan, a foreign object in the unit, or a worn bearing.
• Hissing or bubbling are typical signs of a refrigerant leak or air in the circuit.
• A whistling sound when starting the compressor may indicate an emerging mechanical fault.

Note when the noise occurs, which unit it comes from and at what setting, this will save the technician time during diagnosis.

Air conditioning unit is freezing up

A frozen evaporator indicates insufficient airflow or low refrigerant pressure. The cause is usually a clogged filter, lack of refrigerant, or a fan fault. Switch off the frozen unit and allow it to thaw, do not restart while warm and do not remove ice mechanically.

What to try yourself and what better not to attempt

Operation is possible without a technician:

• Check and clean air filters according to the device instructions.
• Check the flow of the visible part of the condensate drain.
• Check thermostat and control panel settings
• Check whether the circuit breaker for the air conditioning circuit has not been switched off.

Leave everything else to a professional: especially:

• Any work on the refrigerant circuit (refrigerant top-up, leak detection and repair).
• Electrical repairs and component replacement
• Chemical cleaning of evaporator and condenser
• Diagnosis of the compressor and control electronics

Any intervention in the refrigerant circuit without a valid F-gases certification is an offence and may complicate insurance claims in the event of damage.

Why response time matters

In the hospitality, healthcare or legal sectors, a cooling failure in summer months is measured in hours, not days. An overheated server room or an out-of-order air conditioning system in a hotel wing are not just comfort issues. They are operational risks with direct financial consequences.

Emergency service exists precisely for situations when a standard booking appointment is not feasible. The key parameter is simple: the time from reporting the fault to the technician's arrival on site.

How emergency air conditioning service works

1. Reporting a fault - by phone with a description of symptoms, type and location of the equipment.
2. On-site diagnosis - The technician will measure pressures in the refrigerant circuit, check the electrical system, airflow and the condition of components.
3. Repair or temporary measure - The technician will resolve most common faults in a single visit. A second visit may be required for compressor failures or special spare parts once components are secured.
4. Service documentation - Any intervention in the refrigerant circuit must be documented in the F-gas logbook in accordance with current EU legislation.

Frequently Asked Questions

What to do if your air conditioner starts leaking into the hotel room at night?

Turn off the air conditioning in the affected room and report the fault to the emergency service line. Do not leave the unit running, condensation water may cause damage to furniture and ceiling structures by morning.

How do I know if my air conditioner is losing refrigerant?

Typical signs include a significantly reduced cooling capacity despite the unit otherwise functioning, evaporator icing or hissing sounds from the unit. A technician will perform an accurate leak diagnosis by measuring pressures in the refrigerant circuit.

Does regular maintenance also apply to older units?

Yes, regular servicing is more important for older air conditioners than for new ones. A clean filter, clear condensate drainage and refrigerant check can significantly extend the life of units that are many years old and prevent costly breakdowns.

Does a technician need special authorisation to work with refrigerants?

Yes. Handling of F-gases (refrigerants used in air conditioning) may only be performed by a natural person holding a valid certificate issued by an authorised person in accordance with EU Regulation No 517/2014. Always request proof of certification.

Emergency intervention within 24 hours: for businesses in Prague 1 and central Prague

An air conditioning failure in operation has a specific time limit by which the situation must be resolved. A hotel, medical practice or law firm in central Prague cannot afford to wait for an available appointment next week.

We provide emergency air conditioning service for businesses in Prague 1 and the surrounding city centre, with arrival within 24 hours of reporting the fault. Our technicians hold valid certification for handling F-gases and work with commercial equipment from all major manufacturers.

Contact us at the first sign of a fault: our emergency line is available outside standard working hours.