Expansion Vessel Manaut Micon 24 E Ref. BI1172103

Boilers Biasi compatible with reference BI1172103

Expansion vessel with reference BI1172103. Eight confirmed compatibilities: Micon 24 E and Micon 23 E.

Verified 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 BI1172103 is the 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 BI1172103. 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 expansion vessel BI1172103

The expansion vessel absorbs the expansion of water when heated. These are the typical symptoms and what to do:

Common symptoms and faults

• 01

  The boiler loses pressure on its own within a few days, and it needs to be refilled with the filling key repeatedly.

  Cause: The expansion vessel has lost its pre-charge air (due to membrane rupture or a leak in the valve) and no longer compensates for the expansion of the water.

  With the boiler cold and the circuit without pressure, press the Schrader valve of the expansion vessel: if no air comes out or water comes out, that's the problem; also check fittings and bleed valves in case the leak is elsewhere.

• 02

  The safety valve drips or discharges water every time the boiler heats up.

  Cause: Without the cushioning of the expansion vessel, the expansion of the hot water directly results in overpressure that opens the gas valve.

  Check the cold fill pressure before declaring the vessel empty; if it is already high when cold, the issue may be with the filling and not the vessel.

• 03

  A knocking or "hammer" sound is heard in the pipes when the heating pump starts.

  Cause: The vessel no longer absorbs the pressure peak generated by the start of the circulator.

  Bleed the radiators properly and check that the shut-off valves are fully open before attributing it to the expansion vessel.

• 04

  The tank feels swollen, bulging, or hot to the touch on its bottom side.

  Cause: The inner membrane has ruptured and the vessel has filled with water instead of air, losing its damping function.

  With the circuit depressurized, press the valve of the expansion vessel; if water comes out instead of air, the membrane is broken and cannot be repaired.

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.

Expansion vessel data sheet Biasi BI1172103

Catalogue reference

BI1172103

Uniclima internal SKU

VECMM24E

Brand

Manaut

Type of part

Expansion vessels

Units in stock

5 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 engraved on the part

CP392