Aircon PCB (Printed Circuit Board) controls sensors, fan speed, relays, compressor start, drainage logic and protection modes. When PCB fails, the AC stops responding, misreads temperature, shuts down for no reason, overheats, leaks water or won’t start the fan/compressor. We don’t guess — we test and confirm the real board failure before repair.
What This Service Fixes
- No power or no response from indoor unit
- Fan motor not receiving correct command/signal
- Outdoor unit not releasing heat due to control failure
- AC not cold — compressor not starting via PCB relay
- Wrong temperature reading from sensors (NTC misread)
- Water leak due to drain pump or tray control logic failure
- Random shutdowns (protection mode triggered incorrectly)
- Error codes showing sensor, relay or control faults
Most Common PCB Failure Causes in KL
- Humidity damage affecting board circuits
- Power surge or unstable supply
- Burnt relays controlling fan/compressor
- Faulty sensor circuit (temperature misread)
- Connector/track wear from heat stress
- Corrosion on board contacts due to climate
How We Diagnose PCB
- Check power distribution and board response
- Test relay outputs for fan and compressor start
- Validate sensor readings and NTC circuit stability
- Inspect connectors, tracks, burn or corrosion points
- Confirm indoor vs outdoor PCB fault location
- Repair the root board failure and re-test under load
What Our PCB Repair Includes
- Accurate diagnosis of AC printed circuit board failure
- Indoor or outdoor board inspection (track, relay, corrosion, heat damage)
- Sensor and relay circuit validation
- Failure-point repair and controlled reassembly
- Post-fix test: fan command + compressor start + cooling stability
- Clean work guarantee and clear confirmation of board fix
Indoor vs Outdoor PCB — Why It Matters
- Indoor PCB: handles sensors, fan speed and tray/drain logic
- Outdoor PCB: handles compressor, condenser fan and overheat protection
When PCB Repair Is Urgent
- Compressor not starting at all
- Outdoor fan not responding and unit overheats
- Error codes for sensors/relays keep returning after reset
- Burning smell or visible heat marks on PCB
- AC randomly shuts down during long runs
What to Expect During Service
- No guessing — real test confirmation first
- Clean work and correct board reassembly
- Functional re-test after repair
- Clear explanation of indoor or outdoor board fault
Service Coverage (Kuala Lumpur)
We repair aircon printed circuit and control boards for indoor and outdoor units across Kuala Lumpur condos, landed homes and offices. Share your location, unit type and symptoms on WhatsApp — we’ll confirm scheduling.