Saunier Duval Micraplus NOx Gas Valve Ref. 0020039188
It regulates and allows gas to flow to the burner under the command of the PCB of the Saunier Duval Micraplus NOX boiler. When it fails, the boiler does not ignite, there may be flame lockouts, or the gas modulation is not adequate. The user may experience fault codes such as F.26, F.61, F.62, or F.28. It is installed in models such as the Micraplus NOX 24 and 24-B-2, as well as in various models from the Thema NOX and Themafast NOX ranges of Saunier Duval, among others. It is recommended to replace the gas valve when these symptoms or faults occur.
Hermann boilers compatible with reference 0020039188
Gas valve with reference 0020039188. Eight confirmed compatibilities: Micraplus NOX 24 and Micraplus NOX 24-B-2.
Proven compatibility
| Boiler model | Family | Verification |
|---|---|---|
| Hermann Micraplus NOx 24 | Hermann Micraplus NOX | Contrasted |
| Hermann Micraplus NOx 24-B-2 | Hermann Micraplus NOX | Contrasted |
| Hermann Thema NOx F25 | Saunier Duval Thema NOX | Contrasted |
| Hermann Thema NOx F25-B | Saunier Duval Thema NOX | Contrasted |
| Hermann Themafast NOx F25 | Saunier Duval Themafast NOX | Contrasted |
| Hermann Themafast NOx F30 | Saunier Duval Themafast NOX | Contrasted |
| Hermann Isotwin C25 | Saunier Duval Isotwin | Contrasted |
| Hermann Isotwin F25 | Saunier Duval Isotwin | 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 reference 0020039188 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 0020039188. 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 gas valve 0020039188 resolves.
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 locks up when starting the ignition cycle.
Cause: The gas valve does not open the gas flow to the burner, so the spark ignites but does not find fuel.
Check that the ignition electrode produces a spark and that the ionization cable is properly secured before replacing the gas valve.
- 02
There is a smell of gas in the area of the boiler, even when it is turned off.
Cause: Over time, the internal seal of the gas valve may lose tightness and allow gas to escape.
Pass soapy water through the gas inlet and outlet connections before suspecting the valve itself: a dried gasket gives off the same smell.
- 03
The valve does not respond electrically: the opening click is not heard when turning it on.
Cause: A fault in the coil or in the internal wiring prevents the gas valve from receiving the command to open.
Measure continuity and voltage at the gas valve connector before purchasing it; if there is no power, first check the wiring and the PCB.
- 04
The boiler operates intermittently: sometimes it ignites and other times it shuts down by itself.
Cause: A defective internal contact in the gas valve can open and close the gas flow irregularly.
Try to ignite several times in a row and observe if the fault always occurs at the same point in the cycle; this helps to differentiate a gas valve fault from a PCB fault.
Fault codes Hermann that this part solves
| Code | Fault | Diagnosis and solution |
|---|---|---|
| F.26 | Fault: gas valve not functioning. | The stepper motor of the gas valve (0020039188) is disconnected/faulty or there is a break in the harness; check the continuity of coils and wiring, and control voltage; if it does not operate, replace the gas valve. |
| F.61 | Gas valve activation fault. | Short circuit to ground in coils or defective gas valve causes switching fault; check harness to the valve, coil resistance, and activation signal; if there is a leak or coils are out of tolerance, replace the valve. |
| F.62 | Gas valve fault. Disconnection delay. | The valve remains open or leaks (not sealed) and closes with delay; check the tightness of the valve assembly (leak test) and observe the flame signal shutdown; if delay/leak is confirmed, replace the valve. |
| F.28 | Start-up fault: ignition failed. | Incorrect/defective gas valve prevents flow/opening during ignition; check inlet pressure, adjustment, and operation of the valve during start-up attempt (and combustion parameters). |
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 gas valve Hermann 0020039188
- Catalogue reference
- 0020039188
- Brand
- Hermann
- Type of part
- Gas valves
- Units in stock
- 0 units
- 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.
- Component code
- VKA515MR2521
- Additional codes on label
- 40 1145 00810 / 0220 061 131 -1
- Operating temperature
- -15°C to +70°C
- Degree of protection
- IP00
- Diameter
- 12 mm
- Batch/date (green label)
- 331/13, 4C
Frequently asked questions about the gas valve 0020039188
Which models are compatible with the Saunier Duval Micraplus NOX gas valve Ref. 0020039188?
What label code does the gas valve of the Micraplus NOX have?
What is the connection diameter of the gas valve of the Micraplus NOX?
What temperature range does this valve operate in when installed in the Thema NOX F25?
What fault indicates that this gas valve needs to be replaced in the Isotwin F25?
What is the reference for the gas valve Saunier Duval Micraplus NOX?
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