Schematics for MCBA 1461D
I could not verify any public component-level PCB schematic for the MCBA 1461D itself. What I did verify is that official boiler manuals provide:
So, if by “schematics” you mean the internal electronic circuit of the PCB, I do not see a public OEM release. If you mean the boiler wiring / terminal schematic, that does exist in the manuals. (freeboilermanuals.com)
The MCBA 1461D appears in official Remeha documentation as the boiler’s main burner/control box. In the Remeha Quinta 85 technical manual, section 8.2.2 identifies the control box as “Gasmodul – Model: MCBA 1461 D” and lists key electrical data: 230 V / 50 Hz, 10 VA, pre-purge 4.2 s, post-purge 10 s, safety time 4.2 s max, and pump run-on timings. The same manual also warns: “Do not use connector X8!” (freeboilermanuals.com)
More importantly for your request, the Gas 110 Eco 115/65 manual contains an actual “Schematic diagrams” section. It includes:
That means there are two different documentation levels available:
| Documentation type | Availability | |
|---|---|---|
| Internal PCB/component schematic for MCBA 1461D | Not found publicly | |
| Boiler-level wiring / terminal / principle diagrams using MCBA 1461D | Found in official manuals | (freeboilermanuals.com) |
For one verified implementation, the Gas 110 Eco 115/65 manual gives these external terminal functions:
| Terminals | Function | |
|---|---|---|
| 1–2 | 0–10 V or modulating controller | |
| 3–4 | On/Off, 1st stage | |
| 5–6 | High/Low, 2nd stage, or outdoor sensor | |
| 7–8 | DHW sensor or volt-free thermostat | |
| 10–14 | Safety interlock | |
| 17–18 | DHW diverting valve or pump, max 1 A | |
| 19–20 | Boiler/system pump, max 1 A | |
| 21–22 | Common alarm, volt-free, opens on failure | |
| 23–24 | Boiler run, volt-free, closes on run | (freeboilermanuals.com) |
That is the closest publicly available material I could verify to an MCBA 1461D “schematic.” (freeboilermanuals.com)
As of May 6, 2026, current online parts listings still identify a related board as S59402 / Control MCBA 1461/5461 D V3.1 Rev 2, associated with some Remeha/Broag appliances. However, those listings do not provide full internal schematics; they are mainly spare-parts references. (heatingspareparts.com)
So the practical situation today is unchanged: service documentation exists, but full board-level circuit documentation is not publicly exposed. (freeboilermanuals.com)
From an electronics perspective, the MCBA 1461D is not just a generic relay board; it is a burner-management and safety control unit. The manuals show it interfaces with:
That is why official documents tend to publish system wiring and terminal functions, rather than the internal PCB circuit. In practice, for field service, the manufacturer expects:
The official manuals explicitly state that these gas appliances must be installed by a competent qualified engineer and must not be modified contrary to the manufacturer’s instructions, because incorrect installation can create an unsafe condition. (freeboilermanuals.com)
So if your goal is component-level repair of the MCBA 1461D PCB, I would strongly advise against returning such a repaired board to live boiler service unless it is validated to the appropriate combustion-safety standard by a qualified professional. (freeboilermanuals.com)
If you want something usable immediately, I recommend this sequence:
Tell me the exact boiler model the board came from
Examples: Remeha Quinta 85, Gas 110 Eco 65, etc. The same MCBA family is used in different appliances, and the wiring context matters. (freeboilermanuals.com)
Tell me what kind of schematic you need
Check the board marking
Use only the appliance-specific manual Do not assume one MCBA 1461D installation is pinned identically to all others. (freeboilermanuals.com)
If you want, I can next do one of these:
Short version: no public internal PCB schematic located, but there are official external wiring/principle diagrams for boilers using the MCBA 1461D. The best verified sources I found are:
If you send me the exact boiler make/model or a photo of the board label/connectors, I can turn the verified manual data into a practical wiring sheet for you.