⚡ 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) Authorized Service Centers Across 82+ Pune Hubs
Select your locality below to access direct emergency dispatch, local arrival SLAs, and genuine MHI (Mitsubishi Heavy) replacement parts.
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