Sealed Combustion Chamber Vaillant ecoTEC Plus 5-5 (Giannoni GM30-45-004-11) — Ref. GM30-45-004-11
Refurbished sealed combustion chamber set with primary condensing heat exchanger Giannoni GM30-45-004-11 for Vaillant ecoTEC plus boilers. It forms the combustion envelope and transfers heat to the heating circuit. Check compatibility by reading the label on your original chamber.
VAT included
Consult via WhatsAppHow to check if the reference GM30-45-004-11 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.
Symptoms and faults that the GM30-45-004-11 combustion chambers solve.
Common symptoms and faults
- 01
It heats up very quickly and then locks out (F.23/F.24)
Cause: Primary heat exchanger blocked by sludge/deposits or air in the circuit
Measure ΔT supply/return, bleed, check the dirt separator/return filter, and the actual flow rate of the pump.
- 02
Boiling noises (kettling) on demand
Cause: Internal incrustation in the primary coil
Check water hardness, inspect the primary circuit, and assess controlled chemical cleaning.
- 03
Condensate drips or corrosion marks on the casing
Cause: Primary perforation or fatigued joints
Visual inspection of the casing and condensate collector; check the siphon/funnel and tightness.
- 04
Frequent F.22/F.75 lockouts after bleeding.
Cause: Insufficient circulation due to partial blockage of the primary or persistent air.
Repeated bleeding, checking the pressure sensor, and flow testing; if it persists, clean/replace the primary.
- 05
Smell of gas or traces of soot on the casing
Cause: Loss of tightness in the chamber
Check the cover gasket and screws; replace single-use gaskets and perform combustion/leak test.
Fault codes from Vaillant that this part resolves.
| Code | Fault | Diagnosis and solution |
|---|---|---|
| F.22 | Lack of water or pressure too low in the circuit | Fill up to ~1.5 bar, bleed the system, check for leaks and the pressure sensor. If the issue persists, check circulation and the condition of the primary heat exchanger for possible obstruction. |
| F.23 | Lockout due to excessive temperature difference between supply/return | Complete bleeding, check the pump, filters/deaerator, and flow rate. A dirty or clogged primary can cause an abnormal ΔT; consider cleaning or replacement. |
| F.24 | Safety disconnection due to overheating | Check the opening of valves, circulation, air in the circuit, and the condition of the heat exchanger. If the flow is insufficient due to deposits, clean or replace the primary. |
| F.28 | Flame is not detected during ignition. | Although it is usually associated with gas/ignition, a chamber without tightness or with obstructed condensate drainage can affect combustion. Check the chamber gasket, siphon, and flue gas evacuation. |
| F.75 | Insufficient pressure change when starting the pump | Fill/bleed, check pressure sensor and pump. A hydraulic blockage in the heat exchanger may prevent pressure increase; inspect and clean/replace. |
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.
Data sheet for the combustion chambers Vaillant GM30-45-004-11
- Catalogue reference
- GM30-45-004-11
- Brand
- Vaillant
- Type of part
- Combustion chambers
- Units in stock
- 1 unit
- Status
- Refurbished
- Warranty
- 1 year
- Shipping
- 1-2 business days
- Return
- 14 days
Data read on the part and in the manufacturer's documentation
What we have not been able to verify does not appear here.
- Type of part
- Sealed combustion chamber with primary condensing heat exchanger (assembly)
- Component manufacturer
- Giannoni France
- Component reference
- GM30-45-004-11
- Observed identifiers
- Customer n° 901041; it may appear as 11.10.41.02404 / 102404T3 on the label.
- Intended application
- Vaillant ecoTEC plus boilers with Giannoni chamber/heat exchanger; confirm by the equipment part's PCB.
- Include
- Chamber body + primary heat exchanger (according to unit). Does not include fan, cover, burner, or gaskets unless expressly stated.
- Status
- Refurbished
- Cut off gas and electrical supply and allow to cool down before intervening.
- Complete bleeding of the heating circuit and the condensate siphon after installation.
- Use new single-use gaskets in the chamber, blower, and condensate collector (e.g., 0020025929).
- Tighten the cross of the chamber cover according to the torque specified in the model manual.
- Gas tightness test and combustion verification after the change (adjust CO₂ if necessary)
- Do not manipulate if you do not have accreditation; risk of gas and CO leakage.
- Do not confirm compatibility based on commercial references: the component's PCB is the authority.
Frequently asked questions about the combustion chambers GM30-45-004-11
Is it compatible with my Vaillant ecoTEC plus VMW 246/5-5?
Does it include fan, cover, burner, or gaskets?
What faults of the boiler are related to this part?
Does it require parameterization after the change?
