Expansion Vessel for Boiler Micra Condens 26 - Ref. 77002563
The expansion vessel for the Micra Condens 26 boiler is a component that absorbs the increase in water volume when heated. When it fails, you may notice that the boiler pressure rises and falls sharply, and the safety valve may also leak. This vessel is compatible with several models, such as those in the Habitat and Micra ranges, among others. It should be replaced when there is a loss of pressure or if the membrane is broken.
VAT included
Consult via WhatsAppRenova boilers compatible with reference 77002563
Expansion vessel with reference 77002563. Nine confirmed compatibilities: 2 24 SE and 23 SE.
Proven compatibility
| Boiler model | Family | Verification |
|---|---|---|
| Renova 2 24 SE | HABITAT | Contrasted |
| Renova 23 SE | HABITAT | Contrasted |
| Renova 2 24 E | MICRA | Contrasted |
| Renova 2 24 SE | MICRA | Contrasted |
| Renova 23 SE | MICRA | Contrasted |
| Renova 24 SE | MICRA | Contrasted |
| Renova CONDENS 26 | MICRA | Contrasted |
| Renova MICRA 2 24 SE | RENOVA | Contrasted |
| Renova MICRA 23 SE | RENOVA | Contrasted |
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 ref. 77002563 is the part for your boiler
What determines it is not the boiler model, but the reference printed on the part you already have installed.
- Find the reference printed on the installed part and check whether it matches the catalogue reference 77002563. If it is not visible, do not identify the part from its shape alone.
- Check the full boiler model on its data plate and look for it in the model associations on this page.
- Compare the connections and physical body with the original part before installation.
- If anything is unclear, send us a photo of the marking via WhatsApp before placing your order.
Symptoms and faults that the expansion vessel 77002563 resolves.
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 heating circuit gradually loses pressure and needs to be refilled every few weeks.
Cause: When the expansion vessel loses its air charge, it stops compensating for the expansion of the water, and the system becomes unbalanced over time.
Before replacing the expansion vessel, check for leaks in the radiators, at the bleed valves, and in the connections of the boiler.
- 02
The safety valve has started to intermittently release water, without a clear pattern.
Cause: A vessel without an expansion margin directly transmits any increase in pressure to the safety valve, which acts as a last resort.
Note when it drips exactly (starting, running, stopped) to rule out other causes before blaming the glass.
- 03
It is noticeable that the tank is full, without the typical hollow sound when tapping it with your knuckles.
Cause: The broken membrane allows water to enter the air chamber, and the expansion vessel loses its ability to cushion.
Gently tap on different areas of the tank: if it sounds equally solid at the top and bottom, there is no air left inside.
- 04
The pressure rises more than usual right when starting the heating and then remains high.
Cause: Without an air cushion, the increase in volume of the hot water directly translates into pressure on the circuit.
Measure the cold pressure and check it again a few minutes after the heating is turned on; a marked increase indicates the expansion vessel.
Fault codes for Renova that this spare part resolves.
| Code | Fault | Diagnosis and solution |
|---|---|---|
| 33 | Control cycle: the air pressure switch does not switch. | The differential pressure switch for fumes does not close when the fan starts; check with a manometer/ohmmeter the switching of the pressure switch and ensure there are no obstructions/water in the inlets and flue duct. |
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 sheet Renova 77002563
- Catalogue reference
- 77002563
- Brand
- Renova
- Type of part
- Expansion vessels
- Units in stock
- 5 units
- Status
- Refurbished
- Warranty
- 1 year
- Shipping
- 1-2 business days
- Return
- 14 days
Manuals and technical documentation
Official documentation of the boiler, useful for locating the part and cross-referencing the fault codes.
- Renova Micra 2 24 SE Manual (PDF)Document © Renova, provided as a technical reference.
Frequently asked questions about the expansion vessel 77002563
Is this expansion vessel Ref. 77002563 compatible with the Micra Condens 26?
When should the expansion vessel of the Habitat 23 SE be replaced?
Spare parts related to Renova MICRA
