Main PCB Saunier Duval Thema F 23 E Ref. 05741000
RefurbishedSaunier DuvalPCBs (control boards)

Main PCB Saunier Duval Thema F 23 E Ref. 05741000

Stock · 1 unit

Main PCB of the boiler; it has the 'Saunier Duval' logo screen-printed directly on the circuit. It integrates microcontroller M37481M8T-154SP, relay Zettler AZ698-1A2, and transformer Mercury T28-0438: it is the central control that manages the ignition and overall operation of the unit. It is replaced when ignition faults, intermittent electronic errors, or the display becomes unresponsive without apparent mechanical cause occur.

VAT included

Compatibility

Saunier Duval boilers compatible with reference 05741000

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

Proven compatibility

Boiler modelFamilyVerification
Saunier Duval C 23 EThemaContrasted
Saunier Duval F 23 EThemaContrasted
Saunier Duval C AS 23 EThemaContrasted
Saunier Duval F AS 23 EThemaContrasted
Saunier Duval C 23 EThemaplusContrasted
Saunier Duval F 23 EThemaplusContrasted
Saunier Duval C 23 ECombitekContrasted
Saunier Duval F 23 ECombitekContrasted

Can't see your model or have questions? The printed reference takes precedence. How to check it ·

Guide

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

What determines it is not the boiler model, but the reference printed on the part you already have installed.

  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.
Diagnosis and fault codes

Symptoms and faults that the PCB 05741000 resolves.

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 does not ignite and the display remains off or frozen.

    Cause: The transformer on the PCB powers the control part; if it fails, the display and the ignition logic do not respond.

    Measure the output voltage on the transformer before declaring the PCB (control board) as dead.

  • 02

    The fault is intermittent: one day it starts up properly and another day it locks out for no apparent reason.

    Cause: Internal faults of the microcontroller or its connections cause variable behaviors.

    Note the date and time of each fault to identify patterns before changing the PCB.

  • 03

    The pump, the valve, or the burner do not start even though the boiler 'pretends to ignite'.

    Cause: The output relay of the PCB provides voltage to these elements; if they do not switch, they remain without power.

    Measure with a multimeter if the affected component receives voltage when it should be activated, before replacing the PCB.

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.

Technical data

Data sheet for the Saunier Duval 05741000 PCB.

Catalogue reference
05741000
Brand
Saunier Duval
Type of part
PCBs (control boards)
Units in stock
1 unit
Status
Refurbished
Warranty
1 year
Shipping
Delivery time shown at checkout
Return
14 days

Data read on the part and in the manufacturer's documentation

What we have not been able to verify does not appear here.

PCB code
ST1349 CAO 6023
Relay
ZETTLER AZ698-1A2, AC 250V 8A
Transformer
MERCURY T28-0438, primary 24V~50/60Hz (1-5), secondary 48V~0.05VA (8-10), EN61558 CLASS E TUV
Microcontroller
M37481M8T-154SP
Code printed on the back of the PCB
109042/B
Documentation

Manuals and technical documentation

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

Frequently Asked Questions

Frequently asked questions about the PCB 05741000

Is the PCB Ref. 05741000 for the Saunier Duval Thema F 23 E factory original?
Yes, it has the "Saunier Duval" logo and name screen printed directly on the circuit.
What boilers are compatible with this PCB besides the Thema F 23 E?
Combitek C/F 23 E, Thema C 23 E, and Themaplus C/F 23 E, according to the compatibility list of this document.
How do I check if this PCB Ref. 05741000 is the one for my boiler?
Compare the code "ST1349 CAO 6023" engraved on the PCB and the "109042/B" on the back with those appearing on your unit.
What fault requires changing this PCB in a Combitek or Thema 23 E?
It is replaced when ignition faults occur, intermittent electronic errors arise, or the display stops responding without any apparent mechanical cause.
Does this PCB Ref. 05741000 have its own relay and transformer?
Yes, Zettler relay AZ698-1A2 and Mercury transformer T28-0438, both identified on the label.

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Main PCB Saunier Duval Thema F 23 E Ref. 05741000