Case Study: Daikin 1.5 Ton Inverter AC Outdoor Not Starting & U4 Error Code Fix
🔴 Problem Description & Symptoms
Mr. Anurag Tripathi (Sector 14, Indira Nagar) ne urgent service request book ki. Unka Daikin Inverter Split AC on karne par indoor blower fan chal raha tha lekin kamre me koi cooling nahi ho rahi thi (sirf normal room temperature fan air fek raha tha).
Remote controller se diagnostic code check karne par "U4" flash ho raha tha, jiska matlab hota hai indoor unit aur outdoor compressor unit ke beech communication transmission break ho chuki hai. Outdoor unit ka fan aur compressor start hi nahi ho rahe the.
🔍 Inspection & Technical Diagnosis
Hamare AC specialist Amit Sharma ne precision diagnostic step perform kiye:
- Interconnecting Cable Test: Indoor aur outdoor ke beech 4-core communication wire continuity check ki gayi — cable bilkul sahi thi aur cuts nahi the.
- Outdoor PCB Voltage Test: Outdoor PCB ke terminal 1 aur 3 ke beech DC voltage fluctuate ho rahi thi. PCB cover open karne par pata chala ki voltage spike hone ki wajah se optocoupler IC aur communication bridge capacitor burn ho chuke the.
🟢 Chip-Level Repair & Restoration
Daikin company ke service center ne customer ko poora outdoor PCB board naya lene bola tha jiska quote ₹9,200 tha.
- Hamare technician ne PCB ko on-site safely dismantle karke precision soldering se burnt optocoupler IC aur high-voltage capacitor ko replace kiya.
- PCB par moisture aur dust protectant coating apply ki gayi.
- R32 gas working pressure check kiya gaya (130 PSI suction pressure perfectly normal mila).
- AC on karne ke 3 minute ke andar outdoor compressor smoothly engage ho gaya aur room temperature 24°C par cooling shuru ho gayi!
Savings For Customer:
Customer ne poora board badalne ke bajay chip-level component repair karwaya jisse unke ₹6,000 se zyada bache, saath me 90-day doorstep warranty mili!
Customer Feedback
"Company wale bol rahe the naya PCB aane me 5 din lagenge aur 9000 kharch hoga. RB Care ne same day aake 1.5 ghante me board repair kar diya aur aade se kam paise liye. Very knowledgeable and genuine technician."
AC Thandi Hawa Nahi De Raha Ya Error Code Hai?
Daikin, Voltas, Hitachi, LG, Samsung, Blue Star ya Lloyd AC repair ke liye abhi call karein. Gas refill, PCB repair & regular service at doorsteps in Lucknow.