Hydraulic Body Fagor FE-11DL Ref. ST0027740

Fagor boilers compatible with the reference ST0027740

Hydraulic group with reference ST0027740. 15 verified compatibilities: AQUALUX-11E1B and AQUALUX-11E1N.

Proven compatibility

Can't see your model or have questions? The printed reference takes precedence. How to check it · Send us a photo via WhatsApp.

How to check if the part number ST0027740 is the piece 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 ST0027740. 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.

Symptoms that require diagnosis in the hydraulic group ST0027740

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

  A puddle or water dripping appears under the boiler, especially when it is running.

  Cause: The hydraulic body has a leak in one of its joints and water is coming out from there.

  Locate the exact point of the dripping with the boiler off and then while running: if it comes from a specific joint or fitting, sometimes it is enough to change that joint and not the entire body.

• 02

  The heating circuit needs to be filled every few days because it loses pressure.

  Cause: A crack in the hydraulic body is slowly leaking water, even though there is no clear puddle visible.

  Before changing it, check the radiator bleeds and the expansion vessel: a slow pressure loss can also be due to that.

• 03

  There are stains of limescale or green algae around the area where the hydraulic body is mounted.

  Cause: The water that comes out from a deteriorated joint of the hydraulic body leaves that white or greenish trace when it dries.

  Clean the area and check again after a day or two of operation to confirm that the stain reappears and is not an old residue.

• 04

  The boiler is locking out due to low pressure even though you have just refilled the circuit.

  Cause: If the hydraulic body continuously loses water, the water pressure switch detects the drop and locks the boiler for safety.

  With the boiler off, check if the pressure gauge needle drops on its own over a couple of hours: this way you can distinguish a real leak from a fault in the pressure switch itself.

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.

Hydraulic group sheet Fagor ST0027740

Catalogue reference

ST0027740

Uniclima internal SKU

VACF2601

Brand

Fagor

Type of part

Hydraulic units

Units in stock

0 units

Status

Refurbished

Warranty

1 year

Shipping

Delivery time shown at checkout

Return

14 days

Part data and available documentation

Contrast the label codes, PCB, and revision with the installed part; they are not necessarily equivalent references.

Code on label 1

901919

Code on label 2

VAFQG0979

Code on label 3

000010

Label code 4

0291672T2