Honeywell Gas Valve VK8525M 1003.1.1 For Saunier Duval Isofast F 30 E-A

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 even after you reset it.

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

  Make sure that the gas shut-off valve is open and that there is supply pressure before replacing the gas valve.

• 02

  You can hear the ignition attempt but no gas reaches the burner.

  Cause: The opening coil can receive current and still not open the gas flow.

  With a multimeter, measure that current is reaching the connectors of the gas valve right at the moment of the ignition attempt.

• 03

  The boiler repeatedly locks out due to ignition fault.

  Cause: Each cycle without sufficient gas counts as an ignition failure, and the control unit locks out after several consecutive attempts.

  Check the ignition electrode and its cable before considering the valve as the culprit; a weak spark produces the same symptom.

• 04

  A slight smell of gas is detected near the gas valve.

  Cause: An internal seat that does not close completely can cause a small leak even when the boiler is not operating.

  Apply soapy water to the joints of the valve with the boiler turned off to locate the exact point of the leak.

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

Actuator type / code

VK8525M 1003.1.1

Coil voltage

24 VDC

Gas

Natural gas

Place of manufacture

Czech Republic

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.