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.
- Type of part
- Combustion chambers
- Status
- Refurbished
- Catalogue reference
- GM30-45-004-11
- Warranty
- 1 year
How to check if the reference GM30-45-004-11 is the part for your boiler.
The part reference, model, and equipment revision must be verified against the manufacturer's documentation.
Symptoms that require diagnosis in the combustion chambers GM30-45-004-11
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.
Vaillant fault codes that require diagnosis
| Code | Fault | Technical checks |
|---|---|---|
| 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
- Uniclima internal SKU
- CAMCVXX
- Brand
- Vaillant
- Type of part
- Combustion chambers
- Units in stock
- 3 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.
- 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?
