VRF & VRV System SpecialistsAdvanced Diagnostics
Expert Maintenance for Daikin, LG, Mitsubishi & Samsung. We resolve PCB failures, Comms Errors, and Gas Leaks.
- Inverter PCB Board Repair
- Comms Error Fix (U4/E1)
- Compressor Replacement
- EEV Valve Diagnosis
- Gas Leak Detection
Recent VRF System Repairs
Successful diagnostics involving Inverter Boards, Refnet Leaks, and Communication Failures across Dubai.
Inverter PCB Replacement
Diagnosis & Solution
Outdoor unit was dead. Diagnosed burnt IGBT module on Main Inverter PCB caused by voltage fluctuation. Replaced board, applied thermal paste, and reprogrammed.
Gas Leak Repair at Refnet
Diagnosis & Solution
System low on gas (Error E3). Traced micro-leak to a cracked Refnet Joint in the ceiling. Brazed the joint under Nitrogen flow and recharged R410A.
Communication Wire Shielding
Diagnosis & Solution
Intermittent U4 communication errors. Found unshielded signal wires running parallel to high-voltage cables. Re-wired with shielded cable to stop noise interference.
EEV Valve Replacement
Diagnosis & Solution
Indoor unit freezing up. Service checker showed EEV (Electronic Expansion Valve) stuck at 10% opening. Replaced valve body and coil to restore flow.
Inverter Compressor Change
Diagnosis & Solution
Compressor seized due to oil return failure. Flushed piping network, installed new Daikin Inverter Scroll Compressor, and verified Hz modulation.
Live Telemetry & Logistics
Real-time coordination of our 17 specialist teams across Dubai.
Dynamic Map Interface for Registered Clients...
VRF System Engineering
Advanced engineering solutions for Daikin, LG, and Mitsubishi systems. Our team specializes in Inverter Logic, Communication Networks, and Refnet Balancing.
1VRF Outdoor Unit (Heat Pump)
The central inverter engine powering multiple indoor units.
Technical Info
Located on rooftops. Uses Inverter Scroll Compressors to modulate refrigerant flow based on demand. Vulnerable to high ambient heat (T3 Condition).
Working Principle
Variable speed compressor adjusts Hz to maintain precise cooling, saving up to 40% energy compared to fixed-speed units.
Service Protocols & Engineering
Inverter Maintenance
- Inverter PCB Board Repair
- Heat Sink Paste Application
- Noise Filter Board Check
Compressor Works
- Inverter Compressor Replacement
- Oil Balancing Check
- High Pressure Protection Test
2VRF Indoor Units
Silent and efficient cooling for luxury villas and offices.
Technical Info
Connected via copper piping and communication wires. Contains EEV (Electronic Expansion Valve) for precise flow control.
Working Principle
EEV regulates refrigerant entering the coil. Fan speed adjusts automatically based on room temperature sensors.
Service Protocols & Engineering
Component Repair
- EEV Valve troubleshooting
- Drain pump replacement
- Thermistor sensor calibration
Deep Cleaning
- Deep chemical coil cleaning
- Drain tray sanitization
- Filter washing
3Heat Recovery VRF System
Advanced 3-pipe system allowing simultaneous heating and cooling.
Technical Info
Uses a BS Box (Branch Selector) to divert hot gas or liquid refrigerant to different zones. Ideal for premium offices.
Working Principle
Recovers heat from zones requiring cooling and transfers it to zones requiring heating, maximizing thermal efficiency.
Service Protocols & Engineering
BS Box Service
- BS Box solenoid replacement
- 3-Pipe joint leak repair
- Control PCB Logic Check
System Mode
- Simultaneous mode testing
- Refrigerant crossover check
- Pressure equalization
4Communication & PCB Control
The digital brain connecting Outdoor and Indoor units.
Technical Info
Critical Issues: 'Communication Error (U4/E1)' due to signal noise or loose wiring. 'Inverter Board Failure' due to voltage spikes.
Working Principle
Low-voltage DC signals transmit operational data between units via a daisy-chain network.
Service Protocols & Engineering
Signal Repair
- Shielded wire continuity check
- Daisy-chain verification
- Address setting conflict resolution
Board Logic
- Inverter PCB replacement
- Firmware updates
- IGBT Module Testing
5Copper Piping & Refnets
The complex web of copper pipes carrying R410A gas.
Technical Info
Critical Issues: 'Gas Leakage' at flare nuts or brazing joints. 'Oil Return Failure' causing compressor seizure due to bad piping design.
Working Principle
Refrigerant flows through main pipes and splits via 'Refnet Joints' to supply individual indoor units.
Service Protocols & Engineering
Leak Services
- Nitrogen pressure leak testing
- Refnet joint brazing
- Flare nut retightening
Gas Works
- Vacuuming & Dehydration
- R410A Gas charging
- Oil trap installation
Technical Pricing
Transparent Rates for VRF Diagnostics & Repair. 5% VAT Included.
VRF Health Check
- Computer Diagnosis (Service Checker)
- Error Log Review
- Filter Cleaning
- Sensor Calibration
PCB Board Repair
- Inverter Board Supply
- Heat Sink Paste
- IGBT Testing
- Installation & Programming
Compressor Replacement
- Inverter Scroll Compressor
- PVE Oil Charge
- R410A Gas Refill
- Vacuuming
Digital Error Log Report
We use manufacturer diagnostics tools to download 100-point error history and real-time sensor data. Receive a professional PDF health report via WhatsApp.
Data Logging
Compressor Hz, EEV pulse, & coil temps.
WA Delivery
PDF reports sent directly to your phone.
Job Card #410A
System Diagnostic Report
ANALYSIS:
Error Code U4. Signal path re-terminated and addressed. Hz modulation verified.
VRF Lifecycle Protection
Maximizing asset value through preventive technical care.
Typical Lifespan
Quality systems last 10-15 years. Technical PPM extends this by 30% via specialized cleaning.
Inverter PCB Care
Dust causes U2 over-current errors. We use technical chemicals to degrease sensitive electronics.
Network Stability
Daisy-chain signal noise causes system shutdowns. We audit shielding continuity.
UNITECH VRF Specialists
Dubai HVAC • Open 24h
Mr. Al Futtaim
Local Guide
"The Daikin VRV system in my villa had a U4 error for weeks. UNITECH technicians found the loose signal wire in minutes. Very knowledgeable."
Facility Manager
Local Guide
"We had a seized inverter compressor. They quoted half the price of the manufacturer and finished the job in 2 days. The new compressor is silent."
Sarah Johnson
Local Guide
"My cassette units were leaking water. They cleaned the drain pumps and flushed the pipes. Professional service and clean work."
Official Partners & Service Providers
Brands We Specialize In
Frequently Asked Questions
Do you serve commercial buildings?
Yes, we specialize in high-capacity VRF networks for hotels, malls, office towers, and large-scale industrial warehouses.
Is your technical repair work guaranteed?
Absolutely. We provide a 1-month comprehensive warranty on all service labor and up to 1-year warranty on replaced Inverter Compressors and OEM PCBs.
How quickly can your diagnostic team arrive?
For emergency breakdowns in Dubai, we target an arrival time of under 60-90 minutes depending on sector traffic.
Why is chemical cleaning mandatory for VRF?
Conventional water washing cannot remove the microscopic salt and dust cemented onto aluminum fins. Our technical foam lifts this grime to restore thermal conductivity.