Mitsubishi Heavy Industries, Ltd. (MHI) • Tokyo • Founded 1884
Installation and repair of Mitsubishi Heavy air conditioning in Madrid
MHI technical service for the Diamond range: SRK, SRF, SRC, and VRF systems. Specialised diagnostics, original parts, and preventive maintenance in Madrid and the metropolitan area.
The confusion we are asked about daily: Is Mitsubishi Heavy the same as Mitsubishi Electric?
No. They are two completely independent companies, although both descend from the historical Mitsubishi conglomerate and share the three-diamond logo. Mitsubishi Electric Corporation (Mr. Slim, MSZ‑HR, MSZ‑FH) is a publicly traded company that manufactures consumer electronics, industrial automation, and residential air conditioning. Mitsubishi Heavy Industries, Ltd. (MHI) It is a separate company specialized in heavy industry (naval, aerospace, infrastructure) that also has an air conditioning division (SRK, SRF, Diamond). The equipment, spare parts, technicians, and distribution networks are completely different. A spare part for the MSZ‑HR not working for an SRK-ZS and vice versa.
💡 About Mitsubishi Heavy
Mitsubishi Heavy Industries Air Conditioning Europe S.A. distributes the range in Spain Diamond of residential inverter splits and the KX series VRF systems for commercial use. In the residential sector, the SRK range (the Diamond name corresponds to the highest efficiency series) has a smaller presence than Mitsubishi Electric in Madrid, but it has a loyal base of installers who prefer it for its robust construction and the reliability of the scroll compressor. The availability of spare parts in Spain is adequate, although not as immediate as in higher volume brands.
Mitsubishi Heavy range in Spain
- SRK‑ZMP series (Diamond) — The premium range of MHI Air Conditioning. A+++, integrated WiFi, motion sensors for automatic adaptation. The most installed in high-end residential.
- SRK‑ZS series — Mid-high range. A++, WiFi, high durability scroll compressor. The favourite in small hotels and tourist apartments.
- SRK‑ZR / SRF series — Standard range, forced draught, A+. Without built-in WiFi. For installations where budget matters and reliability is a priority.
- SRC-KN (cassette) — Ceiling cassette units for offices, restaurants, and commercial spaces.
- FDT‑KN / FDTQ series — 4-way cassette for larger commercial installations.
Warning and diagnostic codes
| Code | Cause | Intervention |
|---|---|---|
| E1 | Indoor temperature sensor | Internal thermistor out of range; check and replace |
| E5 | Heat exchanger temperature sensor | Evaporator NTC; check position and resistance |
| E9 | Discharge temperature sensor | Defective compressor discharge thermistor |
| P0 | High pressure protection | Dirty condenser, fan stopped, or high gas |
| P4 | Drain float | Tray full; clean or check drain pump |
| P8 | Communication error | Damaged communication cable between units |
Frequently Asked Questions about Mitsubishi Heavy
They are products of comparable quality in equivalent ranges. The Diamond (SRK-ZMP) has a scroll compressor with performance very similar to the Premium Inverter from Mitsubishi Electric and similar A+++ efficiencies. The main difference is not in quality but in the service network and availability of spare parts: Mitsubishi Electric has greater penetration in Spain and MSZ spare parts are easier to find in stock. In terms of product reliability itself, both brands have a very low fault rate.
Availability and lead time are confirmed for the specific reference and destination before accepting the order. Not all parts are in stock or have the same supply time.
Monthly or bimonthly filter cleaning during active use. Annual technical maintenance: deep cleaning, pressure verification, drainage check, and electrical inspection. Mandatory with documentation for installations subject to RITE (premises and communities).
Mitsubishi Heavy spare parts in stock
- PCB for SRK‑ZS, SRK‑ZMP, and SRF series
- Ambient, evaporator, and discharge NTC thermistors
- Indoor and outdoor fan motors
- Replacement WiFi modules