The Customer's Situation
Encik Faizal bin Mohd Noor, the facilities manager for a 3-storey commercial office building in Bangsar, contacted us for the annual maintenance of their Daikin VRV IV system — 3 outdoor units connected to 24 indoor units across three floors housing a digital marketing agency, accounting firm, and co-working space.
"The second floor co-working space has been getting complaints about uneven cooling," Faizal explained. "Some zones are too cold while others barely feel the aircond. And our TNB bill has increased about 15% over the last two months."
Issues Identified
- Uneven cooling across second floor — up to 4°C difference between zones
- TNB bill increased 15% with no change in usage patterns
- 2 out of 3 outdoor condenser coils heavily fouled with dust and debris
- One branch controller showing intermittent E3 communication error
- Refrigerant pressure slightly below optimal on System 2
- 4 temperature sensors drifted from calibration
Our Maintenance Approach
Our team of 3 technicians led by senior VRF specialist Encik Kamal divided the work into three phases — one floor at a time — to minimise disruption.
Work Completed
- Deep cleaned all 24 indoor unit coils, filters, drain pans, and blower fans
- High-pressure cleaned all 3 outdoor condenser coils
- Replaced faulty branch controller communication cable — resolved E3 error
- Topped up R410A refrigerant on System 2 (approximately 500g)
- Recalibrated 4 temperature sensors showing drift
- Flushed all 24 drain lines
- Updated BMS settings and rebalanced second floor airflow
- Full system performance test — all zones within 1°C of setpoint
Root Cause Analysis
The uneven cooling was caused by drifted temperature sensors (reading 2-3°C higher than actual) combined with the intermittent communication error on the branch controller. The 15% TNB increase was from fouled condenser coils forcing compressors to work harder. After cleaning, condensing temperature dropped 6°C — translating to 15-20% efficiency improvement.
As explained in our VRF system guide, regular condenser cleaning is critical for these systems.
Pricing
- Indoor unit cleaning x 24: RM2,880
- Outdoor condenser cleaning x 3: RM900
- Cable replacement: RM180
- Gas top-up: RM240
- Sensor recalibration + BMS: RM300
- Performance report: RM300
- Total: RM4,800
Customer Feedback
"Very professional team. Serviced all 24 units in one day without disrupting tenants. Second floor cooling issue fixed completely. The detailed report is excellent for my building committee."
— Encik Faizal bin Mohd Noor, Bangsar
Have a VRF/VRV System That Needs Servicing?
Our VRF-trained technicians maintain Daikin, Mitsubishi, LG, and other commercial systems across KL and Selangor.
Get Free Quote