Saunier Duval Gas Valve Complement Themafast Condens F Honeywell Ref. 0020018436
When you open the hot water tap or start the heating, the Gas Valve Saunier Duval Complemento Themafast Condens F Honeywell Ref. 0020018436 activates to regulate the flow of gas to the burner. This valve is essential for the operation of the boiler, as a failure can cause the boiler not to ignite, flame lockouts, or incorrect gas modulation. Users may notice issues such as the fault code F.26, which indicates that the gas valve is not functioning, or F.28, which signals an ignition failure. It is compatible with models from the Themafast Condens range, such as F30, F30E, and F24E, as well as the Thema Condens F24E. It is recommended to replace it upon detecting these faults to avoid further problems.
VAT included
Consult via WhatsAppSaunier Duval boilers compatible with reference 0020018436
Gas valve with reference 0020018436. Four confirmed compatibilities: Themafast Condens F30 and Themafast Condens F30E.
Proven compatibility
| Boiler model | Family | Verification |
|---|---|---|
| Saunier Duval Themafast Condens F30 | Themafast Condens | Contrasted |
| Saunier Duval Themafast Condens F30E | Themafast Condens | Contrasted |
| Saunier Duval Themafast Condens F24E | Themafast Condens | Contrasted |
| Saunier Duval Thema Condens F24E | Thema 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.
How to check if ref. 0020018436 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 0020018436. 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 0020018436 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 or tries to ignite several times before starting.
Cause: If the venturi does not mix the air and gas properly, the control board does not detect the flame in time and stops the ignition.
Check that the flue duct and the air intake are not obstructed before replacing the assembly.
- 02
The flame is unstable, flickers, or changes color depending on the power.
Cause: A faulty venturi or collector alters the gas and air ratio that reaches the burner.
Check that the joints and connections of the manifold are not leaking air before replacing the part.
- 03
The boiler loses power or modulates poorly when switching from domestic hot water to heating.
Cause: The venturi collector regulates the amount of gas according to demand; if it is damaged, the modulation is not accurate.
Note if the fault occurs only in one mode (domestic hot water or heating) or in both, it will help you identify if it is this part or another.
- 04
A whistling or unusual suction noise is heard near the burner.
Cause: A crack or wear in the venturi alters the airflow and generates noise.
Locate whether the noise is coming specifically from that area before purchasing, and not from the fan or the flue extractor.
Fault codes from Saunier Duval that this spare part resolves.
| Code | Fault | Diagnosis and solution |
|---|---|---|
| F.26 | Fault: gas valve not functioning. | The stepper motor/coils of the valve do not operate or are disconnected, so it does not open/modulate. Check the continuity of the coils, connector, and harness up to the PCB and ensure it receives voltage in test P.0. |
| F.27 | Safety shutdown: incorrect flame detection. | The sealed gas solenoid valve may allow gas to pass when it should be closed, causing an implausible flame signal. Check the valve's tightness/closure and absence of flame with the gas cut off. |
| F.28 | Start-up fault: ignition failed. | Among the causes is an incorrect/faulty gas valve that does not open or supply flow. Check inlet pressure, that the valve is the correct reference, activation signal, and pressure/output during the ignition attempt. |
| F.56 | Fault in the regulation of the circulating flow sensor. | The manual associates this fault with a faulty gas valve or its wiring harness, so a defective valve may cause incorrect flow/mix reading/regulation. Check the valve and wiring; if it reappears after adjustment, replace the valve. |
| F.61 | Gas valve control fault. | The PCB detects that it cannot activate the valve (coils grounded/cut). Check insulation and resistance of coils, continuity of the harness, and control output from the electronics. |
| F.62 | Gas valve fault. Disconnection delay. | The valve sticks or leaks and takes time to close after the flame extinguishes. Check that the flame signal drops when the gas is cut and the valve's tightness/quick closure; replace if there is a delay/leak. |
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 Saunier Duval 0020018436
- Catalogue reference
- 0020018436
- Brand
- Saunier Duval
- Type of part
- Gas valves
- Units in stock
- 7 units
- Status
- Refurbished
- Warranty
- 1 year
- Shipping
- Delivery time shown at checkout
- Return
- 14 days
Manuals and technical documentation
Official documentation of the boiler, useful for locating the part and cross-referencing the fault codes.
- Saunier Duval Themafast Condens F24E Manual (PDF)Document © Saunier Duval, provided as a technical reference.
Frequently asked questions about the gas valve 0020018436
Is the gas valve Saunier Duval Complemento Themafast Condens F Honeywell Ref. 0020018436 compatible with the boiler Themafast Condens F30?
Which boiler models are compatible with this gas valve?
What is the function of the gas valve in the boiler?
How many boiler models are compatible with the reference CVGTCF24?
What fault codes may be related to this gas valve?
Spare parts related to Saunier Duval Themafast Condens
