Aircond Frozen Coil and Ice Buildup on Copper Pipe in Kelana Jaya Office

The Customer's Situation

Encik Faizal bin Mohd Razak manages a small accounting firm on the 3rd floor of a commercial building in Kelana Jaya. His office has two Panasonic 2.0HP wall-mounted aircond units — one serving the main work area where six staff members sit, and another in the meeting room.

He first noticed a problem when his staff started complaining that the main area unit wasn't cooling properly despite running all day. Then one Monday morning, Encik Faizal arrived early and found water dripping from the indoor unit onto the carpet tiles below. When he opened the front panel, he saw a thick layer of ice covering the entire evaporator coil, and the copper pipe going into the wall was coated in frost.

"I thought the aircond was completely rosak," Encik Faizal told us when he called. "I've never seen ice on an aircond before. I turned it off immediately but wasn't sure what to do next."

He WhatsApped us photos of the ice buildup, and our team recognised the issue right away. We scheduled a visit for the next morning.

Diagnosis: A Two-Part Problem

Our technician Hafiz arrived at 9am and started with a thorough inspection. He quickly identified that the main unit's freezing was caused by two issues working together — making it worse than either problem alone.

First, the severely clogged filters were restricting airflow to the evaporator coil. With six staff members working in the space daily, plus the office being near a main road, dust accumulation was exceptionally heavy. The filters hadn't been cleaned since the last service about five months ago.

Second, and more critically, the main unit had a slow refrigerant leak at one of the flare connections where the copper pipe connects to the indoor unit. Hafiz measured the R410A gas pressure at 90 PSI — well below the normal operating range of 115-125 PSI for that unit. Lower gas pressure means colder refrigerant temperature, which combined with the restricted airflow, caused rapid ice formation.

The meeting room unit was in better shape — its freezing was only in the early stages and was caused purely by the dirty filter, since its gas pressure was normal. That office used the meeting room less frequently, so less dust, but the filter was still overdue for cleaning.

The Repair Process

Hafiz explained the situation to Encik Faizal and outlined the repair plan. For the main unit, they'd need to defrost the coil, fix the gas leak, recharge the refrigerant, and do a full cleaning. For the meeting room unit, a thorough cleaning would resolve the issue.

The Leak Repair

The gas leak was at the flare joint — the brass connection point where the copper refrigerant pipe meets the indoor unit's service valve. Over time, thermal expansion and contraction (the pipe heats and cools constantly during operation) can loosen these joints, especially if they weren't torqued properly during installation.

Hafiz disconnected the joint, re-flared the copper pipe end using a proper flaring tool (a clean, precise flare is essential for a leak-free seal), and reconnected it with the correct torque specification. He then used an electronic leak detector to confirm the seal was tight before recharging the gas.

Why Both Problems Together Were So Bad

Encik Faizal asked why the freezing was so severe on the main unit. Hafiz explained that either problem alone might have caused minor frost, but together they created a compounding effect. The dirty filter reduced airflow, which lowered the coil temperature. The low gas pressure further lowered the refrigerant temperature. Combined, the coil temperature dropped well below -5°C, causing rapid and heavy ice buildup that completely blocked the coil within hours of turning on.

The heavily clogged filters were the other contributing factor. This is entirely preventable with basic aircond maintenance between services — even just cleaning filters every 2-3 weeks makes a huge difference.

This is actually a common scenario in commercial offices where aircond units run 8-10 hours daily — slow gas leaks develop unnoticed because the cooling loss is gradual, and filter cleaning gets overlooked because everyone assumes "it still works." By the time the ice appears, both problems have been building for weeks or months.

Results

• Main area unit: Cooling output fully restored. Air outlet temperature at 12°C (was barely 22°C before). Room reaches 24°C set temperature within 20 minutes.
• Meeting room unit: Early frost eliminated. Air outlet temperature at 13°C. Smooth, efficient operation.
• No more water leaking — drain pans flowing freely and coils operating at correct temperature.
• Staff immediately noticed the difference — several commented that the office felt cooler than it had in months.

Pricing Breakdown

• Aircond cleaning × 2 units: RM160
• Gas leak repair (re-flare joint): RM80
• R410A gas recharge (main unit): RM200
• Vacuum service: RM40
• Total: RM480

Encik Faizal was relieved — he'd been expecting a much higher bill, possibly even needing to replace one or both units. As our technician explained, frozen coil problems usually have fixable root causes. You can read more about the common causes in our guide on why aircond coils freeze up.

Maintenance Plan Going Forward

We recommended Encik Faizal set up a quarterly aircond service schedule for both units — every 3 months, our technician will come in, clean the filters and coils, check gas pressure, and inspect all connections. For a commercial office running aircond 8-10 hours daily, quarterly servicing prevents exactly this kind of problem.

We also showed him how to clean the filters himself between professional visits — a simple 5-minute task every 2-3 weeks that makes a huge difference in preventing airflow problems.

We recommended the office switch to a quarterly servicing schedule going forward to prevent a recurrence. For offices with heavy foot traffic, every 3 months is the minimum recommended frequency.

Customer Feedback

"I was worried we'd need to buy new aircond units — that would have been a big expense for our small firm. Hafiz explained everything clearly, fixed both units in one visit, and the cost was very reasonable. The office is cooling properly again and my staff are happy. Will definitely use Total Aircond for our quarterly service from now on."

— Encik Faizal bin Mohd Razak, Kelana Jaya