Saunier Duval Isofast C 35 E1 Display Module Ref. 05721000
Refurbished Saunier Duval PCBs (control boards)

Saunier Duval Isofast C 35 E1 Display Module Ref. 05721000

The Saunier Duval Isofast C 35 E1 Display Module is a control PCB that manages the ignition, burner modulation, pump, and safety features of the boiler. When it fails, the boiler may not start, become locked, or exhibit erratic operation. Users may notice faults such as F12: No signal from the user interface, F18: User interface failure, or F13: Main printed circuit board failure. This module is compatible with boilers from the Isofast range, including models such as C 28 E, C 35 E, and others. Replacement requires first confirming the fault of the part through technical diagnosis, even when these symptoms or faults are present.

Type of part
PCBs (control boards)
Status
Refurbished
Catalogue reference
05721000
Warranty
1 year
VAT included Stock · 5 units
Compatibility

Saunier Duval boilers compatible with reference 05721000

PCB with reference 05721000. 14 verified compatibilities: C 28 E and C 28 E1.

Verified compatibility

Boiler modelFamilyVerification
Saunier Duval C 28 EIsofastVerified
Saunier Duval C 28 E1IsofastVerified
Saunier Duval C 28 E NOxIsofastVerified
Saunier Duval C 28 E1 NOxIsofastVerified
Saunier Duval C 35 EIsofastVerified
Saunier Duval C 35 E1IsofastVerified
Saunier Duval F 28 EIsofastVerified
Saunier Duval F 28 E1IsofastVerified
Saunier Duval F 35 EIsofastVerified
Saunier Duval F 35 E1IsofastVerified
Saunier Duval C 28 EIsomaxVerified
Saunier Duval C 28 E2IsomaxVerified
Saunier Duval F 28 EIsomaxVerified
Saunier Duval F 28 E2IsomaxVerified

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

Guide

How to check if ref. 05721000 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 05721000. 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 that require diagnosis on the PCB 05721000

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 rear casing of the display module is cracked or broken.

    Cause: Plastic deteriorates with heat and impacts when disassembling the module for inspections.

    Check if the break only affects the casing and not the internal PCB before ordering the part.

  • 02

    The tabs or clips that hold the module to the boiler are broken and the cover does not stay in place.

    Cause: The plastic anchors break when opening and closing the module repeatedly over time.

    Check if you can temporarily hold the cover to confirm that the issue is only with the fastening before purchasing the complete casing.

  • 03

    The display module does not close properly, leaving a gap through which dust or moisture can enter.

    Cause: A deformed casing or one with broken clips does not fit properly with the rest of the module.

    Measure the reference and exact model of your boiler before installing it, to ensure that the front frame fits well in the new casing.

Fault codes Saunier Duval that require diagnosis

CodeFaultTechnical checks
F12No signal from the user interfaceYes — it points to this display/interface module or its connection cable with the main PCB.
F18User interface faultYes — it corresponds to this display/control board module.
F13Main PCB faultNo — that code is for the MAIN PCB (a different part), not for this display.

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 05721000 PCB.

Catalogue reference
05721000
Uniclima internal SKU
MMIC35E1
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
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 05721000

Does the display module ref. 05721000 work for the Saunier Duval Isofast C 35 E1?
Yes, the Isofast C 35 E1 is on the list of boilers compatible with this module.
Is this module compatible with the Saunier Duval Isomax F 28 E2?
Yes, the Isomax F 28 E2 is listed among the boilers compatible with this part.
How do I check that this module ref. 05721000 is the same as the one installed in my boiler?
It cannot be checked by visible marking; you need to verify that the exact model of your boiler is on the list of compatible boilers in the datasheet.

Spare parts related to Saunier Duval Isofast

Delivery calculated by destination Delivery time shown at checkout
1-year warranty inspected and tested
14-day return uninstalled parts
Technical support we verify your model
Saunier Duval Isofast C 35 E1 Display Module Ref. 05721000