Expert Aircond Repair - Diagnosed and Fixed by Senior Technicians

Common Aircond Problems We Fix Every Day

Living in Petaling Jaya’s tropical climate means your aircond works harder than units in temperate countries. The combination of heat, humidity, and continuous operation puts significant stress on every component -from the compressor and capacitor to the thermistor and PCB board. When something goes wrong, you need a technician who can diagnose the problem accurately on the first visit, not a trainee guessing at symptoms.

At PJ Kool Aircond Service, our senior technicians have collectively repaired over 10,000 aircond units across Petaling Jaya and the Klang Valley since 2003. Here are the most common problems we diagnose and fix:

Aircond Not Cold or Blowing Warm Air

This is the number one complaint we receive. The cause could be low refrigerant gas due to a leak, a dirty evaporator coil restricting heat exchange, a failing compressor unable to maintain pressure, or a faulty thermistor sending incorrect temperature readings to the PCB board. Each root cause requires a different fix -which is why proper diagnosis matters more than guesswork.

Water Leaking from Indoor Unit

Water leaks are usually caused by a clogged drainage pipe or a cracked drainage pan. Over time, algae, dust, and debris accumulate in the drain line, causing water to back up and overflow inside your home. In some cases, a frozen evaporator coil (caused by low gas or restricted airflow) can also produce excess water when it melts.

Strange Noises -Rattling, Buzzing, or Clicking

A rattling noise often indicates a loose blower wheel or mounting bracket. Buzzing from the outdoor unit typically points to a failing capacitor or compressor issue. Clicking sounds at startup could signal a faulty relay or electrical connection on the PCB board. Our technicians can identify the exact source by sound alone, then confirm with diagnostic tools.

Aircond Turning On and Off Repeatedly (Short Cycling)

Short cycling wastes electricity and damages your compressor over time. Common causes include an oversized unit for the room, a faulty thermistor, dirty air filters restricting airflow, or low refrigerant causing the compressor to overheat and trigger safety cutoffs. We check amperage draw and PSI readings to determine the root cause.

Our Diagnostic Process -Thorough and Transparent

What the RM50 Diagnostic Includes

Our diagnostic check is not a quick glance at your aircond. It is a systematic inspection that covers:

1. Visual inspection -checking for obvious signs of damage, corrosion, water stains, and ice formation
2. Electrical testing -using a digital multimeter to test the PCB board, capacitor values, relay continuity, and wiring connections
3. Sensor diagnostics -verifying the thermistor is reading temperatures accurately and sending correct signals
4. Compressor evaluation -checking amperage draw, listening for abnormal sounds, and testing start/run capacitors
5. Refrigerant pressure reading -connecting a manifold gauge set to measure PSI readings and identify potential gas leaks
6. Airflow assessment -checking filter condition, blower performance, and evaporator coil state

After the diagnostic, we explain the problem in plain, jargon-free language. We show you exactly what is wrong and provide a clear repair quote. The RM50 fee is fully waived if you proceed with the recommended repair -so you effectively get a free diagnosis.

Honest Advice: Repair or Replace?

We will never pressure you into an expensive repair when replacement makes more sense. Our general guidelines:

• Unit under 7 years old: Almost always worth repairing unless the compressor has failed
• Unit 7-10 years old: Compare repair cost to 40-50% of a new unit price
• Unit over 10 years old: If repair exceeds 50% of a new inverter aircond price, replacement is usually more economical -especially given the electricity savings of modern inverter technology

For units nearing end-of-life, our aircond installation service can help you choose and install the right replacement unit from brands like Daikin, Panasonic, and York.

Types of Repairs We Handle

Electrical Repairs

• Capacitor replacement -the most common repair, causing the outdoor unit to hum without starting
• PCB board repair or replacement -for error codes, communication faults, or sensor failures
• Wiring repair -fixing corroded, burnt, or rodent-damaged electrical connections
• Fan motor replacement -for indoor blower motors or outdoor condenser fans

Refrigerant System Repairs

• Gas leak detection and repair -using electronic leak detectors to find and seal leaks in copper piping and joints
• Gas recharge -topping up or fully recharging R22, R32, or R410A refrigerant
• Copper piping repair -soldering or replacing damaged sections, including Armaflex insulation

Mechanical Repairs

• Compressor replacement -for units where the compressor has failed but the system is worth saving
• Blower wheel replacement -for cracked or unbalanced wheels causing vibration
• Drainage repair -clearing blocked drains, replacing cracked pans, re-routing drainage pipes

Why Experience Matters for AC Repairs

A common frustration among Petaling Jaya homeowners is being sent an inexperienced trainee who cannot accurately diagnose the problem. Misdiagnosis leads to wasted time, unnecessary parts, and inflated bills. At PJ Kool Aircond Service, our zero-newbie policy ensures that every repair job is handled by a senior technician with 15-20+ years of experience.

Mr. Heng, our founder with over 20 years in the HVAC industry, personally trains every team member. Ahmad and Raju each bring over 15 years of field experience. They can often identify the problem by sound and symptom description alone -then confirm with diagnostic equipment. This level of expertise means faster, more accurate repairs and no unnecessary part replacements.

Inverter vs Non-Inverter Expertise

Modern inverter aircond units use variable-speed compressors and sophisticated electronics that require specialised knowledge to diagnose. Many general technicians are not comfortable working on inverter PCB boards or variable-frequency drives. Our team services both inverter and non-inverter models from all major brands, ensuring accurate diagnostics regardless of your unit type.

Same-Day Repair -Most Jobs Done in One Visit

Our technicians arrive with a fully stocked service vehicle carrying the most commonly needed parts -capacitors, thermistors, fan motors, relays, and basic PCB components. For the majority of repairs, we diagnose and fix the issue in a single visit, usually within 1-2 hours.

For specialised parts like OEM compressors or brand-specific PCB boards, we may need 1-2 business days to source the component. In these cases, we provide a temporary workaround where possible and schedule the return visit at your convenience.

Book Your Aircond Repair

Is your aircond acting up? WhatsApp us at 012-2252 623 with a description of the problem and your location. Same-day appointments are available for urgent issues.

If your aircond is working but cooling poorly, it may need a chemical wash rather than a repair. Read our guide on why your aircond is not cold and what to do to understand the most common causes. Our technician will advise you honestly during the diagnostic.