Controller Repair
Mitsubishi PLC
FX3U · FX5U · Q Series · L Series · A Series · iQ-R
Service Mitsubishi MELSEC controllers — we repair CPU, base modules, I/O cards and CC-Link communication modules. Diagnostics included in repair, GX Works program backup before repair, 12-month warranty.
Diagnostics included in repair
No-obligation quote
12-month warranty
Courier pickup from all of Europe
GX Works program backup
Service Mitsubishi MELSEC: repair of FX, Q, L and iQ-R series
Mitsubishi FX3U / FX3G
Repair of compact FX3U, FX3G, FX3S controllers. Service of memory, RS-422 communication ports, expansion cards and power supplies.
Mitsubishi FX5U / FX5UJ
Repair of the newer FX5 series: CPU FX5U-32M, FX5U-64M, FX5U-80M. Service of FX5-8EX/8EY expansion modules and Ethernet cards.
Mitsubishi Q Series
Repair of modular Q02H, Q06H, Q12H, Q25H controllers. Service of I/O cards (QX/QY), Q61P power supplies, QJ61BT11 CC-Link cards.
Mitsubishi iQ-R Series
Repair of R04CPU, R08CPU, R16CPU, R32CPU controllers. Service of RX/RY I/O modules, R61P power supplies and RJ71 network cards.
Mitsubishi A Series (EOL)
Repair of discontinued A1S, A2S, A3H, AnS controllers. Regeneration of I/O cards and EOL power supplies. The fastest way to restore an older production line.
CC-Link and network modules
Repair of CC-Link master and slave cards, Ethernet modules (QJ71E71), MELSECNET cards. Service of RS-232C/485 communication ports.
Why EFIXLAB?
Service Mitsubishi MELSEC focused on minimal downtime
- Priority diagnostics — for stopped lines we react immediately, diagnostics result within 24h.
- GX Works program always backed up — program and configuration backup before every repair.
- Service of A series and older FX — we repair discontinued platforms for which new components are hard to find.
- I/O channel and CC-Link testing — verification of every input, output and communication after repair.
- Fast turnaround — diagnostics up to 5 business days, repair after approval: 5–7 business days (after receiving necessary components). As a rule — time may be extended depending on component availability and repair complexity; deadlines agreed individually.
- 12-month warranty — on every repair performed, without exceptions.
How does repair work for?
Transparent process — no downtime, no surprises
Request
online or by phone
Shipping
by courier
Program backup
+ diagnostics
Quote
no obligation
Repair
& testing I/O
Return
with warranty
Report fault Mitsubishi PLC — no-obligation quote
Provide the model controllers Mitsubishi and fault description. An EFIXLAB specialist will contact you with a diagnosis and quote.
Dziękujemy! We have received your request — our Mitsubishi PLC specialist will contact you shortly.Frequently asked questions
Yes — we repair discontinued A1S, A2S, A3H and AnS platforms. We have components for regenerating these controllers. This is a much faster and cheaper solution than replacing the entire control system.
Yes — before every repair we create a backup of the PLC program from the controller memory. The program is returned with the device. If read-back is not possible (damaged memory), we inform you before proceeding with the repair.
Diagnostics: up to 5 business days (priority for stopped lines). Repair after approval: 5–7 business days (after receiving necessary components). Express mode available on request. As a rule — repair time may be significantly extended depending on component availability and repair complexity. Deadlines are agreed individually with the client.
Yes — we repair CC-Link master and slave cards (QJ61BT11N and others), Ethernet modules and RS-232/485 communication cards. After repair we verify communication correctness on a test bench.
We return the device; if repair is declined, we charge a diagnostics fee (300 PLN net). We assist in finding a replacement or advise on upgrading to a newer MELSEC series.
PLC repair — other brands
repair PLC Siemens
S7-1200, S7-1500, S7-300, S7-400
repair PLC Allen-Bradley
CompactLogix, ControlLogix, MicroLogix
repair PLC Omron
CJ2M, CP1L, CP1H, CS1
repair PLC Beckhoff
CX9020, CX5130, CX5140
repair panels HMI
Siemens, Mitsubishi GOT, Weintek
PLC Repair — all brands
Siemens, Omron, Beckhoff, Schneider
Mitsubishi PLC Repair — MELSEC iQ-R, Q, and FX Series
Mitsubishi Electric MELSEC PLCs — iQ-R, Q-series, L-series, FX5U, and legacy FX3U/A-series — are among the most widely deployed PLCs in Asian and European manufacturing. The MELSEC platform spans from compact FX micro-PLCs for simple machines to high-performance iQ-R systems managing complex production lines with integrated motion control, safety, and network connectivity. Mitsubishi PLCs are standard equipment in automotive, semiconductor, food processing, and general manufacturing.
Common Mitsubishi PLC failures include CPU module processor and memory faults, battery-backed SRAM loss from depleted batteries (causing program and data loss), power supply module degradation, I/O module output transistor burnout (particularly in high-cycle discrete output applications), analog module channel drift, and communication module failures (CC-Link, CC-Link IE, MELSECNET, Ethernet). Legacy A-series and FX2N modules face increasing component aging, while Q-series modules may develop bus connector and backplane communication issues.
At EFIXLAB, we repair Mitsubishi MELSEC PLCs across all product families. Our service covers CPU module board diagnostics and component-level repair, power supply rebuild, I/O module output driver replacement and analog calibration, communication module interface repair, and special function module restoration. We back up and verify PLC programs using GX Works diagnostics and test inter-module communication thoroughly.
Mitsubishi PLC repair delivers excellent value — typically 35–60% savings versus new module purchase. This is particularly important for legacy A-series and FX2N systems where Mitsubishi has discontinued production. For Q-series and iQ-R modules, repair offers meaningful savings while preserving existing automation program compatibility. All Mitsubishi PLC repairs include comprehensive functional testing and our 12-month warranty.