Honeywell Gas Valve VK8525M - Saunier Duval Themafast F 30 E H MOD - Ref. S1071400
Honeywell gas valve model VK8525M, installed in Saunier Duval Themafast F30E boilers and other compatible models under reference S1071400. It regulates the gas flow to the burner through two coils (V1 and V2), with a pressure output adjusted between 5 and 15 mbar. It is replaced when the boiler does not ignite, gets locked during startup, or shows a gas valve fault.
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 and locks out on the first start attempt.
Cause: One of the coils (V1 or V2) does not allow gas to flow to the burner.
Measure the supply voltage on both coils with a multimeter before replacing the gas valve.
- 02
The display shows a gas valve error or flame failure.
Cause: The control board detects that the gas valve does not open or that there is no flame after opening.
Check the wiring and connectors of the gas valve, as they can sometimes come loose due to vibrations, before replacing it.
- 03
The flame rises and falls, or the boiler modulates the power poorly.
Cause: The valve does not correctly regulate the gas flow to the burner according to the demand.
Check that the inlet gas pressure is stable before assuming that the gas valve is faulty.
- 04
There is a smell of gas or a whistling sound in the body of the gas valve.
Cause: An internal gasket is leaking.
Locate the exact point with soapy water; if the leak comes from an external connection, it may not be the gas valve.
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.
- Component manufacturer
- Honeywell
- Valve model
- Honeywell VK8525M
- Part code
- 4000126570
- Coil reference
- 4000 124 245 1
- Type (body marking)
- VK8525M 1045 1.1
- CE code for this unit
- CE-1312BM3041
- Maximum pressure (P.max)
- 60 mbar
- Output pressure (P out)
- 5-15 mbar
- Voltage V1
- 22 Vdc (4VA)
- Voltage V2
- 24 Vdc (0VA)
- Class
- Group 1 / Class B-B
- Degree of protection
- IP20
- Date/batch
- 321/05
- Place of manufacture
- Made in Czech Republic
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 valve of the Saunier Duval Themafast F30E original from Saunier Duval or from another manufacturer?
Does this Honeywell VK8525M gas valve also work for a Glow-Worm GW30CI?
What voltage do the coils V1 and V2 of this valve in the Themafast F30E carry?
Where is the Honeywell VK8525M gas valve, used in the Themafast, manufactured?
Why do I find several different CE codes under the same reference S1071400?
Spare parts related to Saunier Duval Themafast
