Saunier Duval Display Module Keyboard Isofast F28E Ref. 05721000
Refurbished Saunier Duval PCBs (control boards)

Saunier Duval Display Module Keyboard Isofast F28E Ref. 05721000

When you open the hot water tap or turn on the heating, the Saunier Duval Isofast F28E Display Module is responsible for managing the ignition, burner modulation, pump, and safety features of the boiler. If this part fails, you will notice that the boiler does not start, locks out, or operates erratically, potentially displaying fault codes such as F12, F18, or F13. It is compatible with several models from the Isofast and Isomax ranges, such as the F 28 E and the C 28 E, among others. A technician must confirm through diagnosis whether it needs to be replaced when these problems or faults in operation occur.

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 control panel does not turn on or shows nothing.

    Cause: It could be a fault with the module or that it is not receiving power from the main PCB.

    Check that the rear connector is properly seated in its housing before considering the module as faulty.

  • 02

    The keyboard buttons are not responding, even though they were working normally before.

    Cause: The keyboard is a membrane that can lose continuity due to wear, moisture, or accumulated dirt.

    Carefully clean the surface of the keyboard and try again before replacing it; sometimes, it is only necessary to remove dust or grease.

  • 03

    The boiler cannot be programmed or adjusted from the panel, although it continues to provide service.

    Cause: This module controls the programming and parameter adjustment; if it fails, manual control is lost even though the boiler continues to operate with the previous values.

    Note if the boiler maintains the last programmed setting (indicates that the main PCB is functioning) before changing only the module.

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
DISTIF28E
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

Is this screen and keyboard module compatible with an Isofast C 24 E1?
Yes, the Isofast C 24 E1 is among the compatible models listed in this document.
What faults indicate that this module needs to be replaced in an Isofast C 28 E NOX?
It should be checked when the panel does not turn on, the buttons do not respond, or the boiler cannot be programmed. Replacement requires a technical diagnosis.

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
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Saunier Duval Display Module Keyboard Isofast F28E Ref. 05721000