Honeywell VK8525M Gas Valve for Saunier Duval Themafast F 24 E - Ref. S1071400
Honeywell VK8525M gas valve. It is the component that regulates the flow of gas to the burner, controlled by the selector coils according to the demand of the boiler. It is replaced when the boiler does not ignite, shows a gas valve fault, or a leak is suspected in the body of the valve. Actual manufacturer is Honeywell, different from the boiler brand Saunier Duval.
VAT included
Consult via WhatsAppSaunier Duval boilers compatible with reference S1071400
Gas valve with reference S1071400. 24 verified compatibilities: Themafast C 24 E and Themafast C 25 E.
Proven compatibility
| Boiler model | Family | Verification |
|---|---|---|
| Saunier Duval Themafast C 24 E | Themafast | Contrasted |
| Saunier Duval Themafast C 25 E | Themafast | Contrasted |
| Saunier Duval Themafast F 24 E | Themafast | Contrasted |
| Saunier Duval Themafast F 25 E | Themafast | Contrasted |
| Saunier Duval Themaclassic C 24 E | Themaclassic | Contrasted |
| Saunier Duval Themaclassic C 25 E | Themaclassic | Contrasted |
| Saunier Duval Themaclassic F 24 E | Themaclassic | Contrasted |
| Saunier Duval Themaclassic F 25 E | Themaclassic | Contrasted |
| Saunier Duval Themaplus C 24 E | Themaplus | Contrasted |
| Saunier Duval Themaplus F 24 E | Themaplus | Contrasted |
| Saunier Duval Themaplus F 25 E | Themaplus | Contrasted |
| Saunier Duval Thema C 24 E | Thema | Contrasted |
| Saunier Duval Thema F 24 E | Thema | Contrasted |
| Saunier Duval Thema F 25 E | Thema | Contrasted |
| Saunier Duval Thematek C 24 E | Thematek | Contrasted |
| Saunier Duval Thematek F 24 E | Thematek | Contrasted |
| Saunier Duval Isofast F 30 E H-MOD | Isofast | Contrasted |
| Saunier Duval Isofast F 35 E H-MOD | Isofast | Contrasted |
| Saunier Duval Isosplit C 28 E | Isosplit | Contrasted |
| Saunier Duval Isosplit F 30 E | Isosplit | Contrasted |
| Saunier Duval Isosplit F 35 E | Isosplit | Contrasted |
| Saunier Duval Opalia C 16 E | Opalia | Contrasted |
| Saunier Duval Opalia F 14 E | Opalia | Contrasted |
| Saunier Duval Opaliaplus F 17 E | Opalia | 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. S1071400 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 S1071400. 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 S1071400 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 because there is no gas, although you can hear it trying to start.
Cause: The gas valve selector does not open and the burner does not receive fuel when ignited.
Check that the gas supply valve to the boiler is open and that other gas appliances in the house are working properly.
- 02
The display shows a fault or blockage of the gas valve repeatedly.
Cause: The control unit does not detect that the selector opens in time and locks the equipment for safety.
Note the exact code and consult the manual: some gas valve codes may first indicate the pressure switch or the electrode, not the valve.
- 03
There is a smell of gas or a suspected leak in the body of the gas valve.
Cause: The body of the VK8525M gas valve may lose tightness over time and allow gas to escape.
Do not turn on or off switches nearby, ventilate, and turn off the gas valve before a technician confirms the source of the smell.
- 04
The ignition is intermittent: sometimes it lights on the first try and other times it takes several attempts.
Cause: One of the valve selectors does not consistently close the contact, and gas reaches the burner irregularly.
Check if the fault worsens with the boiler cold and just started up, as this helps to differentiate a gas valve problem from an ignition electrode issue.
Fault codes from Saunier Duval that this spare part resolves.
| Code | Fault | Diagnosis and solution |
|---|---|---|
| F.26 | Fault: gas valve not functioning. | The Honeywell gas valve S1071400 does not open because the stepper motor/solenoids do not receive or do not respond to the command. Check the connector/harness, coil continuity, and ensure that the valve is powered during the ignition attempt; also check that there is no pressure at the outlet during the attempt. |
| F.27 | Safety shutdown: flame simulation. | Defective/leaky gas valve S1071400 allows gas to pass when it should be closed, simulating a flame. Check tightness and closure: perform a pressure drop test at the burner inlet and confirm that ionisation ceases when the gas is cut off. |
| F.28 | Start-up fault: ignition failed. | The gas valve S1071400 does not open or is poorly calibrated, preventing the gas supply during ignition. Check that the electronics command opening (voltage to coils) and that pressure appears at the outlet during the attempt; if it does not open or is erratic, replace/adjust. |
| F.61 | Fault: gas valve control. | Electrical defect in valve S1071400 (coil short-circuited/grounded) or in its wiring causes activation fault. Check coil resistance/insulation and continuity of the harness to the PCB; if there is a ground leak or values are out of range, replace the valve. |
| F.62 | Gas valve fault. Disconnection delay. | The S1071400 valve takes time to close or remains unsealed, maintaining gas after the stop command. Check closing time and tightness (pressure/ionisation test after cut-off); if gas or residual flame persists, replace the valve. |
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 Saunier Duval gas valve S1071400.
- Catalogue reference
- S1071400
- Brand
- Saunier Duval
- Type of part
- Gas valves
- Units in stock
- 5 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.
- Manufacturer
- Honeywell
- Valve model
- Honeywell VK8525M
- Visible regulatory marking
- EAC (Eurasian marking, not CE)
- Maximum pressure
- 60 mbar
- Voltage V1
- 22 Vdc (4VA)
- Voltage V2
- 24 Vdc (6VA)
- Class
- Group 1 / Class B+B
- Natural gas selector coil voltage
- 24 VDC / 6 VA
- Coil reference
- 4000 124 246 1
- Date/batch of the coil
- 060/18
- The actual manufacturer of the valve is Honeywell, not Saunier Duval.
Manuals and technical documentation
Official documentation of the boiler, useful for locating the part and cross-referencing the fault codes.
- Saunier Duval Themafast F 25 E Manual (PDF)Document © Saunier Duval, provided as a technical reference.
Frequently asked questions about the gas valve S1071400
Is the VK8525M gas valve Ref. S1071400 an original part from Saunier Duval?
Does this valve VK8525M fit a Saunier Duval Thema F 25 E?
What fault indicates that this valve needs to be changed in an Isofast F 30 E?
What is the consumption of the gas selector coil of the VK8525M valve?
Spare parts related to Saunier Duval Themafast
