Honeywell Gas Valve VK8525M For Saunier Duval Themafast F25 E

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 and the burner clicks several times without producing a flame.

  Cause: The solenoids V1 and V2 do not open the gas flow together, and the control board cannot complete the ignition.

  Measure the gas pressure at the meter; it should be the normal level for the home before blaming the gas valve.

• 02

  The boiler shuts off or locks out just after trying to ignite.

  Cause: A failure to open the solenoid valves V1 or V2 causes the control unit to cut off the supply for safety reasons.

  Note if the cut occurs always when turning on or also with the boiler hot; it is useful information for the technician.

• 03

  The gas supply to the burner is intermittently interrupted during operation.

  Cause: One of the two solenoids may intermittently lose contact and cut off the gas supply without warning.

  Check the condition of the electrical connectors of the gas valve; a poor connection can easily be mistaken for a faulty valve.

• 04

  The flame appears weaker than normal or takes time to stabilize when starting.

  Cause: If one of the two solenoids does not open fully, less gas than necessary reaches the burner.

  Observe the flame through the sight glass when igniting: if it is weak only for the first few seconds and then normalizes, it may not be the gas valve.

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.

Type (TYPE)

VK8525M 1029 11

Voltage

24 VDC

Consumption

6 VA

Gas

Natural gas (GAZ NATUREL)

Degree of Protection (IP)

IP 20

Maximum pressure

60 mbar

V1

22 Vdc (4 VA)

V2

24 Vdc (6 VA)

Class

B+B

Output pressure (P out 2)

15 mbar

Saunier Duval reference

4000 124 545

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 C28E Manual (PDF)Document © Saunier Duval, provided as a technical reference.