Saunier Duval Isofast F28 E Hydraulic Group Pump Ref. 05720900
Refurbished Saunier Duval Hydraulic units

Saunier Duval Isofast F28 E Hydraulic Group Pump Ref. 05720900

The Hydraulic Group Pump Saunier Duval Isofast F28 E is a component responsible for conducting and distributing water among the various circuits of the boiler. When it malfunctions, you may notice leaks, loss of pressure, or issues with the production of domestic hot water. This part is compatible with several Saunier Duval models, such as the Isofast F 28 E, Isofast F 28 E1, Isofast C 28 E, Isofast C 28 E1, Isomax F 28 E, and Isomax C 28 E, among others. A technician must confirm through diagnosis whether it is necessary to replace the hydraulic group when these fault symptoms are detected.

Type of part
Hydraulic units
Status
Refurbished
Catalogue reference
05720900
Warranty
1 year
VAT included Stock · 6 units
Compatibility

Saunier Duval boilers compatible with reference 05720900

Hydraulic group with reference 05720900. Six confirmed compatibilities: Isofast F 28 E and Isofast F 28 E1.

Verified compatibility

Boiler modelFamilyVerification
Saunier Duval Isofast F 28 ESaunier DuvalVerified
Saunier Duval Isofast F 28 E1Saunier DuvalVerified
Saunier Duval Isofast C 28 ESaunier DuvalVerified
Saunier Duval Isofast C 28 E1Saunier DuvalVerified
Saunier Duval Isomax F 28 ESaunier DuvalVerified
Saunier Duval Isomax C 28 ESaunier DuvalVerified

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

Guide

How to check if the part number 05720900 is the correct one 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 05720900. 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 hydraulic group 05720900

The hydraulic group includes the valve, the by-pass, and the water connections. These are the typical symptoms and what to do:

Common symptoms and faults

  • 01

    The radiators are not heating or take a long time to do so even though the boiler starts.

    Cause: The pump of the hydraulic group is not moving enough water, either due to wear or a blocked impeller.

    Check if the pump vibrates or makes noise when starting; if it is completely silent, suspect that it is blocked.

  • 02

    The pump does not start or remains stopped after the summer without using the heating.

    Cause: The rotor may have seized due to sediment buildup during the period of inactivity.

    With the boiler cold, try to unlock the shaft with a flat screwdriver through the front slot.

  • 03

    Do you hear a buzzing or vibration in the area of the hydraulic group while the boiler is running?

    Cause: There may be air in the circuit or a damaged impeller inside the unit.

    Bleed the radiators and the circuit before concluding that the hydraulic group is faulty.

  • 04

    Do you see leaks or moisture under the boiler, near the hydraulic group?

    Cause: The seals of the plastic body can lose tightness with temperature changes.

    Dry the area and observe after a heating cycle to locate the exact point of the leak.

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

Hydraulic group data sheet Saunier Duval 05720900

Catalogue reference
05720900
Uniclima internal SKU
HBSDIF28E
Brand
Saunier Duval
Type of part
Hydraulic units
Units in stock
6 units
Status
Refurbished
Warranty
1 year
Shipping
Delivery time shown at checkout
Return
14 days
Frequently asked questions

Frequently asked questions about the hydraulic group 05720900

For which boiler models is the Saunier Duval Isofast F28 E hydraulic group pump Ref. 05720900 compatible?
It is compatible with the following models: Isofast F 28 E, Isofast F 28 E1, Isofast C 28 E, Isofast C 28 E1, Isomax F 28 E, Isomax C 28 E.
How many models are compatible with this hydraulic group?
There are a total of 6 confirmed models that are compatible.
What type of body does the hydraulic group of the Saunier Duval Isofast F28 E pump have?
The hydraulic group has a black plastic body, according to the available photos.
Are there documented fault codes for this product?
No, there are no documented fault codes for this product.
What is the reference for this hydraulic group?
HBSDIF28E is Uniclima’s internal SKU for locating this listing. To confirm compatibility, check the manufacturer’s reference and the exact appliance model.

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Saunier Duval Isofast F28 E Hydraulic Group Pump Ref. 05720900