L&T Repair Services India
Larsen and Toubro (L&T) is India's foremost engineering conglomerate with over 85 years of industrial heritage. Based in Mumbai, L&T manufactures electrical switchgear, control systems, automation equipment, and industrial drives that power Indian manufacturing across textiles, steel, cement, and heavy industries. Their products are mission-critical in refineries, power plants, and process industries nationwide.
Larsen and Toubro (L&T) is India's foremost engineering conglomerate with over 85 years of industrial heritage. Based in Mumbai, L&T manufactures electrical switchgear, control systems, automation equipment, and industrial drives that power Indian manufacturing across textiles, steel, cement, and heavy industries. Their products are mission-critical in refineries, power plants, and process industries nationwide.
Synchronics specializes in repairing L&T's complete industrial electronics portfolio including electrical switchgear assemblies, AC/DC drive controllers, motor control centers, and automation panels. Our 180+ engineers have diagnosed and resolved thousands of L&T equipment failures across Indian plants. We understand L&T's build quality, failure modes, and component sourcing — ensuring fast, reliable repairs that minimize production downtime.
180+ engineers certified in L&T switchgear, drives, and control system repair.
L&T Equipment We Repair — By Category
L&T Product Lines We Repair
Our engineers are trained on the full L&T product range. Below are the major product families we service.
L&T Electrical Switchgear & MCCs
Industrial-grade motor control centers, distribution boards, and switchgear used in Indian manufacturing. Common failures include contactor coil burnout, relay chatter, and thermal overload tripping under sustained motor loads.
L&T AC Drive Controllers
Three-phase industrial AC drives for pump, fan, and conveyor motors. Repair focuses on IGBT module failures, capacitor dry-out, and encoder communication loss affecting speed feedback loops.
L&T PLC & Automation Panels
Programmable logic controllers and HMI touchscreen interfaces for process automation. Failures include I/O module shorts, power supply brownout damage, and firmware corruption from power surges.
L&T Soft Starters & Contactors
Electronic soft start units reducing inrush current in large motor applications across textile mills and cement plants. Common issues: phase loss detection failure, SCR bridge faults, and control circuit board corrosion.
L&T Distribution Transformers
Medium and low voltage transformers for industrial power distribution. Repair addresses insulation breakdown, copper winding shorts, and oil cooling system leaks affecting transformer efficiency.
L&T Automation & Control Relays
Time-delay relays, sequence relays, and solid-state relay modules embedded in L&T control schemes. Failures stem from contact wear, coil open circuits, and noise immunity issues in high-EMI plant environments.
Why Choose Synchronics for L&T Repairs?
PCB-Level Expertise
We repair down to the component level — not just swap boards. Our engineers identify root causes, replace failed IGBTs, capacitors, processors, and gate drivers on L&T equipment.
Fast Turnaround
Standard 7–10 working days. Express 3–5 days available for critical breakdowns. Emergency same-day/next-day service for unplanned downtime.
6-Month Warranty
Every repaired unit ships with a 6-month comprehensive warranty on parts and labour. Our repair success rate is over 94% across all brands.
All-India Service
Couriered repairs accepted from any city in India. Doorstep pickup available in Vadodara, Mumbai, Pune, Ahmedabad, Surat, Chennai, and more.
Common L&T Equipment Faults We Fix
Based on 30+ years of repair data, these are the most frequent failure modes we see in L&T equipment arriving at our workshop.
- ✓L&T MCC contactor coil burnout and no motor start — Extended undervoltage (90-110% coil rating) causes excessive coil current and insulation breakdown. Common in Indian plants with unstable grid supply where voltage sags to 350V on 415V three-phase systems.
- ✓L&T AC drive shows 'Fault Code F7' — drive not responding to speed command — Encoder cable disconnection or encoder module failure breaks position feedback to L&T's vector control algorithm. Vibration and loose connectors in mill environments are primary culprits.
- ✓L&T thermal overload relay trips repeatedly but motor draws normal current — Relay bimetal strip fatigue after 10,000+ cycles or contact contamination causes false trip threshold sensitivity. Moisture ingress in humid coastal Indian plants accelerates contact oxidation.
- ✓L&T PLC I/O module shows no response to input signals or output relay chatter — Input surge from inadequately filtered inductive loads (solenoids, pump motors) damages input optoisolator circuits. Output relays chatter due to improper snubber diodes on inductive coil loads.
- ✓L&T soft starter SCR bridge not firing — motor remains unstarted despite command — Gate drive transformer saturation or thyristor gate circuit failure prevents SCR triggering. Voltage spikes from motor load transients damage gate drive electronics in unshielded soft starter assemblies.
- ✓L&T distribution transformer oil leaking and temperature rising above 60°C — Gasket seal failure in transformer radiator or winding insulation breakdown increasing core loss heat generation. Thermal cycling and vibration in rail-mounted transformers cause joint loosening over 5+ years.
How We Repair Your L&T Unit
Receive & Log
Your unit is logged into our tracking system with a unique job number. You receive WhatsApp / email updates at every stage.
Fault Diagnosis
Board-level diagnosis using oscilloscopes, LCR meters, and thermal cameras. Root cause identified before any repair begins.
Component Repair
Faulty ICs, capacitors, MOSFETs, IGBTs, and gate drivers replaced with genuine or equivalent-spec components.
Full-Load Test
Unit tested under rated load with original or equivalent motor. All parameters verified. 6-month warranty issued.
Industries Using L&T Equipment
We serve plant maintenance teams across all major industries where L&T automation is deployed.
Frequently Asked Questions — L&T Repairs
Do you repair L&T equipment anywhere in India?+
Yes. Synchronics repairs the full L&T product range — switchgear, AC drives, PLCs, soft starters, and automation panels. We offer pan-India door pickup from Mumbai, Delhi, Pune, Chennai, Hyderabad, Ahmedabad, Surat, Nagpur, and all other major cities. All repairs are performed at our Vadodara, Gujarat facility with 180+ specialist engineers.
What is the typical repair turnaround for L&T motor control center (MCC) faults?+
Standard L&T MCC repairs (contactor replacement, relay testing, control circuit board repair) take 5-7 working days. Emergency rush service is available for critical production lines — we can diagnose and ship repaired MCCs within 48 hours. Costs and lead time depend on fault complexity and parts availability.
My L&T AC drive shows fault code F12 or F15. Can you repair it?+
Absolutely. F12 (overvoltage/bus fault) and F15 (phase loss detection) are common L&T drive faults we repair daily in Indian plants. These typically involve capacitor bank failures, rectifier diode shorts, or phase-loss relay contact wear. We test drives under loaded conditions post-repair and provide a 2-year warranty on IGBT module replacements.
How do I know if my L&T switchgear needs repair or replacement?+
Contact Synchronics for free fault diagnosis. We test contactor coils, measure insulation resistance on winding, check relay response times, and examine contact erosion. If contact erosion is less than 2mm, repair is economical. For heavily corroded units or those >15 years old, replacement is often safer. We help you decide based on cost-benefit analysis and safety standards.
Do you stock L&T spare parts or do I need to supply them?+
Synchronics maintains inventory of common L&T replacement components — contactor coils, relay cartridges, capacitors, fuses, and gate drive transformers. For specialized modules or custom control panels, we source from authorized L&T distributors or recommend equivalent industrial-grade components. Lead times for sourcing are typically 3-5 days within India.
How do I send my L&T unit for repair?+
Pack the unit securely and courier it to our Vadodara workshop. Include a note with the fault description and your contact details. We will log it into our system and WhatsApp you a job number within 24 hours of receipt. Doorstep pickup is available in Vadodara, Ahmedabad, Surat, Mumbai, and Pune.
What is the cost of repairing a L&T drive or PLC?+
Repair cost depends on the model and the fault. We offer a free diagnosis — once we identify the fault, we provide a fixed quotation before proceeding. Typical repairs cost 20–40% of the new unit price. We will never repair without your approval.
What warranty do you provide on L&T repairs?+
All repaired units carry a 6-month comprehensive warranty covering the same fault and related issues. If the fault recurs within the warranty period, we repair it free of cost.
Do you provide a no-fix, no-fee guarantee?+
Yes. If we cannot repair your L&T unit after diagnosis, you pay only the diagnosis fee (₹500–₹1,500 depending on the product). The unit is returned to you at no additional charge.
L&T Repair Catalog
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Other Brands We Repair in the Same Categories
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Send us your faulty industrial electronics. Our engineers will diagnose it and provide a detailed quote within 24 hours — with no obligation to proceed.
Free Evaluation
No obligation
48hr Turnaround
Fastest in India
6-Month Warranty
Every repair
No Fix, No Charge
Zero risk policy
Pan-India Pickup
Doorstep service