Honeywell Natural Gas Valve VK8525M Saunier Duval Isofast F 35 E Ref. S1071500

Saunier Duval boilers compatible with reference S1071500

Gas valve with reference S1071500. 28 verified compatibilities: C24E and C25E.

Proven compatibility

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. S1071500 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.

1. Find the reference printed on the installed part and check whether it matches the catalogue reference S1071500. If it is not visible, do not identify the part from its shape alone.
2. Check the full boiler model on its data plate and look for it in the model associations on this page.
3. Compare the connections and physical body with the original part before installation.
4. If anything is unclear, send us a photo of the marking via WhatsApp before placing your order.

Symptoms and faults that the gas valve S1071500 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 on any attempt.

  Cause: If the gas valve does not open, gas does not reach the burner and it cannot be ignited.

  Check that gas is reaching the property by inspecting another appliance before focusing on the gas valve.

• 02

  The boiler ignites for a moment and then immediately shuts off due to lack of flame.

  Cause: A coil that activates too early or a fault in the ionization signal causes the control unit to detect a flame loss and cut off the gas.

  Clean and check the position of the ionization electrode; if the problem persists with the electrode in good condition, it is likely that the gas valve is failing.

• 03

  The flame modulates irregularly, especially at low power.

  Cause: The modulation coil does not regulate the gas properly when the demand is low, causing fluctuations in the flame.

  Compare the behavior at maximum and minimum power; if it only fails at minimum, check the minimum adjustment of the burner.

• 04

  Leak or poor sealing detected in the valve body.

  Cause: The internal shutter does not seal properly and allows gas to pass through even though the valve should be closed.

  With the boiler turned off, apply soapy water to the connections and the body of the gas valve to locate the leak before replacing it.

Fault codes from Saunier Duval that this spare part resolves.

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 S1071500.

Catalogue reference

S1071500

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

Type/code

VK8525M 1045 1.1

Coil voltage

24 VDC

Solenoid valve V1

22 Vdc, 4 VA

Solenoid valve V2

24 Vdc, 0 VA

Type of gas

Natural gas

Outlet pressure

1.5-15 mbar

Manuals and technical documentation

Official documentation of the boiler, useful for locating the part and cross-referencing the fault codes.

• Saunier Duval Thematek F24E Manual (PDF)Document © Saunier Duval, provided as a technical reference.