SIGMA Gas Valve For Hermann Micra Condens 26 - Ref. 022004879

Gas valve manufactured by SIGMA that regulates the gas inlet and controls the solenoid valves EV1 and EV2 of the Hermann Micra Condens 26 boiler. The catalog attributed it to SIT, but the part label says SIGMA. The replacement requires first confirming the fault of the part through technical diagnosis, even when the boiler does not ignite or there is a gas supply failure to the burner.

Type of part: Gas valves
Status: Refurbished
Catalogue reference: 022004879
Warranty: 1 year

VAT included Stock · 7 units

Compatibility

Hermann boilers compatible with reference 022004879

Gas valve with reference 022004879. A proven compatibility: Micra Condens 26.

Proven compatibility

Boiler model	Family	Verification
Hermann Micra Condens 26	Micra Condens	Contrasted

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

Guide

How to check if ref. 022004879 is the part for your boiler

The part reference, model, and equipment revision must be verified against the manufacturer's documentation.

Find the reference printed on the installed part and check whether it matches the catalogue reference 022004879. 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.

Diagnosis and fault codes

Symptoms that require diagnosis in the gas valve 022004879

The gas valve regulates and modulates the gas flow to the burner. These are the typical symptoms and what to do:

Common symptoms and faults

01
The boiler does not ignite and the display shows an ignition fault when trying to turn it on.
Cause: If the solenoid valves EV1 or EV2 do not open, the burner does not receive enough gas for the flame to ignite.
Measure the gas inlet pressure and check the connectors of both coils before replacing the gas valve.
02
The boiler ignites, but the flame fluctuates on its own, without touching the thermostat.
Cause: The solenoid valve that regulates the modulation (EV2) is not dosing the gas to the burner properly.
Observe the flame through the sight glass: if it fluctuates a lot, note the display code before deciding to change it.
03
The boiler locks with a fault code related to gas when starting it up.
Cause: An electrical fault in one of the coils prevents the gas valve from fully opening as requested by the control board.
Reset the boiler and note the exact code: it will indicate whether the fault is with the gas valve or another component.
04
There is a slight smell of gas when the boiler starts up, although it disappears afterwards.
Cause: An incomplete closure of one of the solenoid valves allows some gas to escape when igniting it.
Check the threaded connections of the gas valve with soapy water before replacing it.

Hermann fault codes that require diagnosis

Code	Fault	Technical checks
35	Parasite flame (flame detection when there should be none).	The gas valve may remain partially open or fail to close on demand, allowing gas to pass and maintaining the flame when it should be off. Check with a manometer at the PINT/PIN ports and ensure that, without power to the coil, the valve closes and the pressure/ionisation drops.

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.

Technical data

Data sheet for the gas valve Hermann 022004879

Catalogue reference: 022004879
Uniclima internal SKU: VGCMC26
Brand: Hermann
Type of part: Gas valves
Units in stock: 7 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.

Inlet pressure (Pl max): 60 mbar
Outlet pressure (Po): 0.5-12 mbar
EV1: 220V~50Hz, 9.2 VA class B
EV2: 220V~50Hz, 2.8 VA class C
Ambient temperature: -10°C / 60°C
Type code: 0063AS 4831
Factory code: Code 0648107, Date 1016, Lot 0008827, Nr 1047

Frequently Asked Questions

Frequently asked questions about the gas valve 022004879

Is the gas valve SIGMA Ref. 022004879 compatible with other models besides the Hermann Micra Condens 26?

No, the gas valve SIGMA Ref. 022004879 is only compatible with the Hermann Micra Condens 26.

What is the outlet pressure of the SIGMA gas valve in the Hermann Micra Condens 26?

The output pressure is between 0.5 and 12 mbar (Po), according to the part label.

Does the code Ref. 022004879 appear printed on the label of the valve?

No, the part shows the codes 0063AS 4831 and Code 0648107, which are different from the catalog reference.

What fault indicates that the gas valve of the Micra Condens 26 needs to be replaced?

The technical diagnosis must confirm whether it is necessary to replace the boiler when it does not ignite or there is a gas supply failure to the burner.

What is the reference for the gas valve SIGMA for the Hermann Micra Condens 26?

VGCMC26 is Uniclima’s internal SKU for locating this listing. To confirm compatibility, check the manufacturer’s reference and the exact appliance model.

What fault codes are documented for this gas valve?

The only documented fault code for this gas valve is 35.

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SIGMA Gas Valve For Hermann Micra Condens 26 - Ref. 022004879