Saunier Duval Thema F 23 E PCB Ref. 05741000

Saunier Duval boilers compatible with reference 05741000

PCB with reference 05741000. Eight confirmed compatibilities: C 23 E and F 23 E.

Verified compatibility

Can't see your model or have questions? The printed reference takes precedence. How to check it · Send us a photo via WhatsApp.

How to check if ref. 05741000 is the part for your boiler

The part reference, model, and equipment revision must be verified against the manufacturer's documentation.

1. Find the reference printed on the installed part and check whether it matches the catalogue reference 05741000. If it is not visible, do not identify the part from its shape alone.
2. Check the full boiler model on its data plate and look for it in the model associations on this page.
3. Compare the connections and physical body with the original part before installation.
4. If anything is unclear, send us a photo of the marking via WhatsApp before placing your order.

Symptoms that require diagnosis on the PCB 05741000

The PCB controls the ignition, modulation, and safety features of the boiler. These are the typical symptoms and what to do:

Common symptoms and faults

• 01

  The boiler doesn't turn on at all, not even the ignition indicator: it seems dead.

  Cause: If the internal fuse of the PCB blows or fails in its power stage, all the electronics will lose power.

  Before replacing the PCB, check with a multimeter if the fuse on the board is blown; it is a cheap fault that mimics that of a dead board.

• 02

  The boiler is working, but the 24V accessories, such as the zone valve or the thermostat, are not receiving power.

  Cause: The transformer that powers that auxiliary circuit is integrated into the PCB, and if it fails, it cuts off power to everything connected to that output.

  Measure with the multimeter if there is voltage at the 24V output of the PCB before declaring it faulty.

• 03

  The boiler turns off by itself from time to time and then restarts as if nothing happened, without showing any error.

  Cause: The microcontroller on the PCB can restart itself due to an internal fault, interrupting the cycle without leaving any visible error trace.

  Check that the boiler is not experiencing micro-cuts in the power supply or a faulty ground connection, which produce the same effect without being the fault of the PCB.

• 04

  The display shows strange symbols or flickers without displaying any readable value.

  Cause: It is a typical symptom that the microcontroller on the PCB does not properly start its own firmware.

  Try performing a complete power cut for a couple of minutes before replacing the PCB, to rule out a temporary hang.

These symptoms can have more than one cause. If your boiler displays a fault code, send it to us via WhatsApp along with a photo of the labeling, and we'll tell you if this is the part.

Data sheet for the Saunier Duval 05741000 PCB.

Catalogue reference

05741000

Uniclima internal SKU

PLCTHEF23

Brand

Saunier Duval

Type of part

PCBs (control boards)

Units in stock

5 units

Status

Refurbished

Warranty

1 year

Shipping

Delivery time shown at checkout

Return

14 days

Part data and available documentation

Contrast the label codes, PCB, and revision with the installed part; they are not necessarily equivalent references.

Supply voltage

230V

Fuse

200 mAT

Transformer TRF1

23535-A, 24V 50/60Hz(6-10), 48V 0.05VA, ta70/B

Microcontroller

Mitsubishi M37481M8T-154SP (marking HCTA07FD 011298, batch 924100)

PCB reference (silkscreened)

0310118200A1 (code ST1389 CAO 4023), printed 'SAUNIER DUVAL'

Manuals and technical documentation

Official documentation of the boiler, useful for locating the part and cross-referencing the fault codes.

• Saunier Duval F 23 E Manual (PDF) Document © Saunier Duval, provided as a technical reference.