Honeywell Gas Valve VK8525M Saunier Duval ThemaClassic F 25E Ref. S1071400
Honeywell VK8525M gas valve, butane-propane variant, mounted on Saunier Duval ThemaClassic F 25 E boilers and related models. It regulates the gas supply to the burner and is powered by 24 VDC. It is replaced when the boiler does not ignite, the flame is cut off, or the burner fails to start.
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 there is no flame at any attempt.
Cause: The VK8525M valve does not open the gas flow to the burner when the control board gives the command.
Check that the main solenoid valve of the liquefied gas installation is open before replacing the gas valve.
- 02
The boiler locks up just when trying to start, without igniting.
Cause: The valve opening time does not match the flame detection window, and the control unit locks out for safety.
Try a single reset and observe if the lockout occurs at the same second of the ignition cycle every time.
- 03
It ignites but the flame goes out after a few seconds, and this repeats.
Cause: The valve closes prematurely or does not maintain the minimum flow required to sustain the flame.
Check the ionization electrode and its wiring, because a poor connection there can also cut off the flame and be mistaken for a gas valve fault.
- 04
There is a smell of gas near the boiler, especially right after an ignition attempt.
Cause: There may be a small leak at the joints or fittings of the gas valve when opening and closing.
Visually inspect the inlet and outlet fittings and tighten them carefully before considering replacing 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
- 1 unit
- 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.
- Valve model
- Honeywell VK8525M
- Voltage
- 24 VDC
- Power
- 6 VA
- Degree of protection
- IP 20
- Gas
- Butane-Propane
- Maximum pressure (P.max)
- 60 mbar
- V1
- 22 Vdc (4VA)
- V2
- 24 Vdc (6VA)
- Class
- Group 1 / Class B-B
- Type of valve (body label)
- VK8525M 1502
- P out
- 2: 30 mbar
- Honeywell part code
- 0020 041 201
- 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 Themaclassic F 25 E Manual (PDF)Document © Saunier Duval, provided as a technical reference.
Frequently asked questions about the gas valve S1071400
Is this Honeywell VK8525M valve for natural gas or for butane/propane?
Is this VK8525M valve suitable for a Saunier Duval Isofast F 30 E?
What voltage does the VK8525M valve need to operate in the ThemaClassic F 25 E?
What is the outlet pressure set for this valve of the ThemaClassic F 25 E?
Who manufactures the gas valve for the Saunier Duval ThemaClassic F 25 E?
Spare parts related to Saunier Duval Themafast
