Saunier Duval ThemaClassic F25E Gas Valve Honeywell VK8525M Ref. S1071400
Honeywell VK8525M gas valve (model confirmed by three sources) for Saunier Duval ThemaClassic F25E boilers and related models, also compatible with Glow-worm. Natural gas coil of 24 VDC/6 VA, maximum input pressure 60 mbar, IP20 protection. It is replaced if the gas does not modulate or the boiler locks out due to supply failure.
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 flame of the burner is unstable, flickering or making irregular sounds.
Cause: The gas valve does not regulate the gas flow properly, which causes unstable combustion.
Check the gas inlet pressure with a manometer; if it is out of range, the gas valve cannot modulate correctly.
- 02
The boiler does not reach the requested temperature no matter how long you wait.
Cause: A valve that does not open fully limits the boiler's power, even if the rest of the system is in good condition.
Check if the problem occurs only at maximum demand or also at low power, to determine if it is the gas valve or the boiler adjustment.
- 03
The boiler locks out with a gas fault code and does not reset on the first attempt.
Cause: If the gas valve does not close or open within the time expected by the control board, the safety system blocks the ignition.
Note the exact fault code before changing the gas valve, as in this range several different faults can present the same symptom.
- 04
There is a slight smell of gas in the boiler room.
Cause: A valve that does not close completely can cause a minimal leak, even when the boiler is turned off.
Shut off the main gas supply, ventilate the room, and do not restart the boiler until a technician confirms the source of the smell.
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
- 2 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.
- Valve model
- Honeywell VK8525M
- Maximum inlet pressure
- 60 mbar
- Coil V1
- 22 VDC, 4 VA
- Coil V2 (natural gas)
- 24 VDC, 6 VA
- Class
- Group 1 / Class B+B
- Protection
- IP 20
- Coil reference
- 4000 124 246 1
- Batch and date
- 004/06
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 VK8525M valve the one that comes factory-installed on the Saunier Duval ThemaClassic F25E?
What is the maximum inlet pressure that the valve of the ThemaClassic F25E can handle?
Does the factory code of this gas valve match the reference S1071400 in the catalog?
When should this Honeywell valve be replaced in a Saunier Duval Thema F24E?
How many models are compatible with the Saunier Duval ThemaClassic F25E gas valve?
What is the reference for this gas valve?
Spare parts related to Saunier Duval Themafast
