⚡ Microcontroller Error Codes
MHI (Mitsubishi Heavy) Searchable Fault & Error Code Guide
| Code | Condition / Symptom | Engineering Diagnosis & Fix |
|---|---|---|
| E5 | Indoor-outdoor communication failure / serial transmission lost | Inspect 3-core signal wiring, verify noise filter board and 12V DC power. |
| E6 | Indoor temperature thermistor open or short circuit | Measure thermistor probe resistance at 25°C, replace thermistor assembly. |
| E9 | Indoor electronic expansion valve LEV coil fault | Test LEV coil winding resistance, replace LEV pulse motor if shorted. |
| E10 | Excessive number of connected indoor units on VRF loop | Verify total connected indoor horsepower against outdoor model tonnage limits. |
| E36 | Outdoor inverter compressor overcurrent / IPM power module short | Check compressor winding isolation, replace outdoor IPM module. |
| E39 | Outdoor compressor discharge pipe temperature overheat (>115°C) | Check for refrigerant leak, inspect LEV opening, recharge virgin gas by weight. |
| E42 | Current sensor malfunction / outdoor inverter drive trip | Test current transformer on PCB, verify supply AC voltage balance. |
Original Factory Parts
Genuine MHI (Mitsubishi Heavy) Replacement Spares & Rate Card
🛡️ 1 Year comprehensive, 5 Years on Inverter Compressor.
| Component / Spare Part | Transparent Pricing (₹) | Warranty Term | Status |
|---|---|---|---|
| ⚙️ MHI Vector Inverter Outdoor Main PCB | ₹3,400 - ₹6,900 | 1 Year OEM Warranty | ✓ Available on Standby Van |
| ⚙️ MHI Tropical Dual Rotary Inverter Compressor | ₹8,200 - ₹13,800 | 5 Years Warranty | ✓ Available on Standby Van |
| ⚙️ MHI Electronic Linear Expansion Valve (LEV) Coil | ₹1,550 - ₹2,750 | 1 Year Warranty | ✓ Available on Standby Van |
| ⚙️ MHI Multi-Zone Wireless/Wired Remote Controller | ₹1,850 - ₹3,400 | 1 Year Warranty | ✓ Available on Standby Van |
⚠️ Field Diagnostics
Common MHI (Mitsubishi Heavy) Breakdown Symptoms
- Outdoor inverter vector drive transistor failure (Error E36/E39)
- Indoor heat exchanger thermistor sensor drift (Error E5/E6)
- Low refrigerant charge detection in multi-split branch lines (Error E42)
- Discharge pipe temperature overheat safety lockout (Error E10)
📋 Certified SOP
Engineering Maintenance Protocol
- MHI M-Service Checker diagnostic data acquisition to inspect frequency steps
- Dual-jet chemical coil pressure cleaning of heavy anti-corrosion blue fins
- Measuring LEV stepper motor winding impedance (46 ohms nominal)
- Leak testing with 450 PSI dry nitrogen hold test
📖 MHI (Mitsubishi Heavy) Field Engineering Guide & Technical Documentation
Mitsubishi Heavy Industries (MHI) certified heavy-duty split AC and KX6/KXZ commercial VRF diagnostics, 3D Vector inverter PCB micro-soldering, and extreme tropical climate cooling across Pune & MIDCs.
⚡ Doorstep Technician Standby Vans
MHI (Mitsubishi Heavy) Certified Diagnostic & Service Hubs Across Pune & MIDCs
Select your locality below to access direct emergency dispatch, local arrival SLAs, and certified MHI (Mitsubishi Heavy) component diagnostics.
Pune-Nagar Road & Shikrapur
<15 min arrival (Direct HQ Van)
Koregaon Bhima Industrial Corridor
📍 PIN: 412216
Pune-Nagar Road & Shikrapur
<15 min arrival (Direct HQ Van)
Talegaon Dhamdhere & Pabal Road
📍 PIN: 412208
Pune-Nagar Road & Shikrapur
<15 min arrival (Direct Highway Van)
Chakan-Shikrapur SH-55 Highway
📍 PIN: 412208, 410501
Pune-Nagar Road & Shikrapur
<15 min arrival (Direct HQ Van)
Tulapur Phata & Khandve Nagar
📍 PIN: 412216
Pune-Nagar Road & Shikrapur
<15 min arrival (Direct HQ Van)
Dingrajwadi Industrial Pocket
📍 PIN: 412208
Pune-Nagar Road & Shikrapur
<15 min arrival (Direct HQ Van)
Kondhapuri Industrial Corridor
📍 PIN: 412208
Greater Maharashtra & Mumbai Corridor
<60 min arrival
Taloja MIDC & Navi Mumbai Industrial
📍 PIN: 410208
Greater Maharashtra & Mumbai Corridor
<60 min arrival
Mahape, Rabale & TTC MIDC (Navi Mumbai IT)
📍 PIN: 400710, 400701
Greater Maharashtra & Mumbai Corridor
<75 min arrival (Regional Team)
Waluj MIDC & Shendra DMIC (Chhatrapati Sambhajinagar)
📍 PIN: 431136, 431007
Greater Maharashtra & Mumbai Corridor
<80 min arrival (Regional Team)
Ambad & Satpur MIDC (Nashik Industrial Hub)
📍 PIN: 422010, 422007
Greater Maharashtra & Mumbai Corridor
<90 min arrival (Regional Team)
Kagal-Hatkanangale Five Star MIDC (Kolhapur)
📍 PIN: 416236, 416109
Greater Maharashtra & Mumbai Corridor
<65 min arrival
Patalganga & Rasayani Chemical Zone
📍 PIN: 410220
Greater Maharashtra & Mumbai Corridor
<60 min arrival
Airoli Mindspace & Hyperscale Data Parks
📍 PIN: 400708
Greater Maharashtra & Mumbai Corridor
<60 min arrival
Turbhe MIDC & APMC Cold Chain Hub
📍 PIN: 400705, 400703
North PCMC Industrial-Residential
<30 min arrival
Nigdi Pradhikaran & PCMC Sector Corridor
📍 PIN: 411044, 411035
Legal Disclaimer & Trademark Notice: ACR Services is an independent engineering and multi-brand service facility. All brand names, model names, product trademarks, and registered logos (including Daikin, Voltas, Blue Star, LG, Carrier, Hitachi, Mitsubishi, Panasonic, Copeland, Danfoss, Bitzer, Trane, York, etc.) referenced on this page are the intellectual property of their respective trademark holders. Reference to them is made solely for descriptive, technical diagnostic, and hardware compatibility identification purposes under nominative fair use, and does not imply any official affiliation with, sponsorship by, or factory authorization from these manufacturers.