Filling Key Saunier Duval Isofast F 28 E1 Ref. 05723000
RefurbishedSaunier DuvalFilling valves

Filling Key Saunier Duval Isofast F 28 E1 Ref. 05723000

VAT includedStock · 3 units

The filling valve Saunier Duval Isofast F 28 E1 is a tap that allows water to be replenished in the heating circuit to maintain the proper pressure. If it fails, the user will notice that the circuit cannot be refilled or that there is a water leak, which can lead to an increase in pressure. This part is compatible with several models of Saunier Duval boilers, such as Isofast C 28 E, Isofast F 28 E, and others in the same range. A technician must confirm through diagnosis whether it needs to be replaced when there are filling issues or leaks.

Compatibility

Saunier Duval boilers compatible with reference 05723000

Filling key with reference 05723000. 20 verified compatibilities: Isofast C 28 E and Isofast C 28 E Nox.

Proven compatibility

Boiler modelFamilyVerification
Saunier Duval Isofast C 28 ESaunier DuvalContrasted
Saunier Duval Isofast C 28 E NOxSaunier DuvalContrasted
Saunier Duval Isofast C 28 E1Saunier DuvalContrasted
Saunier Duval Isofast C 28 E1 NOxSaunier DuvalContrasted
Saunier Duval Isofast C 35 ESaunier DuvalContrasted
Saunier Duval Isofast C 35 E1Saunier DuvalContrasted
Saunier Duval Isofast F 28 ESaunier DuvalContrasted
Saunier Duval Isofast F 28 E1Saunier DuvalContrasted
Saunier Duval Isofast F 35 ESaunier DuvalContrasted
Saunier Duval Isofast F 35 E1Saunier DuvalContrasted
Saunier Duval Isomax C 28 ESaunier DuvalContrasted
Saunier Duval Isomax C 28 E2Saunier DuvalContrasted
Saunier Duval Isomax F 28 ESaunier DuvalContrasted
Saunier Duval Isomax F 28 E2Saunier DuvalContrasted
Saunier Duval Isotwin C 24 EASaunier DuvalContrasted
Saunier Duval Isotwin C 28 EASaunier DuvalContrasted
Saunier Duval Isotwin C24ESaunier DuvalContrasted
Saunier Duval Isotwin F 24 ESaunier DuvalContrasted
Saunier Duval Isotwin F 24 EASaunier DuvalContrasted
Saunier Duval Isotwin F 28 EASaunier DuvalContrasted

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

Guide

How to check if the ref. 05723000 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 05723000. 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 in the filling valve 05723000

The filling valve allows water to refill the heating circuit. These are the typical symptoms and what to do:

Common symptoms and faults

  • 01

    The handle of the tap is stiff or has broken when trying to turn it.

    Cause: The plastic becomes brittle over time due to the heat from the boiler.

    Turn the handle gently to see if it responds or if it is broken inside.

  • 02

    Even with the valve closed, a small trickle or hissing of water is still noticeable.

    Cause: The internal closure does not fully stop due to wear of the mechanism.

    Close the valve completely and listen to see if the water noise disappears.

  • 03

    The faucet drips continuously even when it is closed.

    Cause: The gasket or the internal seat has lost tightness due to use.

    Tighten the closure fully and check if the drop continues after a while with the boiler cold.

  • 04

    When opening to fill, the pressure gauge barely moves or takes a long time to rise.

    Cause: The internal passage is blocked by scale or dirt from the circuit.

    Open and close the valve several times and check if you feel resistance or if the flow is very weak.

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 filling key Saunier Duval 05723000

Catalogue reference
05723000
Uniclima internal SKU
LLMIF28E1
Brand
Saunier Duval
Type of part
Filling valves
Units in stock
3 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 filling key 05723000

Does this filling key work for the Saunier Duval Isofast F 28 E1 boiler?
Yes, the Isofast F 28 E1 is on the list of compatible boilers.
Does this key also work for a Saunier Duval Isomax or Isotwin, or only for the Isofast range?
It is suitable for various ranges: the compatibility list includes Isomax C 28 E, Isomax F 28 E, Isotwin C 24 EA, Isotwin C 28 EA, Isotwin F 24 E, and Isotwin F 28 EA, as well as the entire Isofast range.
What is the purpose of the filling key in the Saunier Duval Isofast F 28 E1?
It allows pressure to be recharged in the system when it falls below the operating range.

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Filling Key Saunier Duval Isofast F 28 E1 Ref. 05723000