Honeywell Gas Valve VK4105M Saunier Duval Isofast/Isomax/Xtrafast Ref. 05719900
Honeywell VK4105M gas valve for Saunier Duval boilers from the Isofast, Isomax, and Xtrafast ranges. It regulates the gas flow to the burner with a dual coil V1+V2 and a maximum pressure of 60 mbar. Manufactured in the Netherlands. It is replaced when the boiler does not ignite, gas does not reach the burner, or a persistent ignition fault occurs.
VAT included
Consult via WhatsAppSaunier Duval boilers compatible with reference 05719900
Gas valve with reference 05719900. Six confirmed compatibilities: Isofast C 28 E and Isofast C 31 E.
Proven compatibility
| Boiler model | Family | Verification |
|---|---|---|
| Saunier Duval Isofast C 28 E | Saunier Duval | Contrasted |
| Saunier Duval Isofast C 31 E | Saunier Duval | Contrasted |
| Saunier Duval Isofast F 28 E | Saunier Duval | Contrasted |
| Saunier Duval Isofast F 31 E | Saunier Duval | Contrasted |
| Saunier Duval Isomax C 28 E | Saunier Duval | Contrasted |
| Saunier Duval Isomax F 28 E | Saunier Duval | 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 the part number 05719900 is the one 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 05719900. 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 05719900 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 or takes several attempts to start.
Cause: The first coil V1 of the gas valve does not open the gas flow to the burner.
Measure if the current reaches both coils V1 and V2 before replacing the entire valve.
- 02
The burner ignites but does not reach the power it should.
Cause: The second coil V2, which regulates the flow, does not open correctly.
Check if the flame increases in size when requesting more power or if it remains flat all the time.
- 03
The boiler still smells of gas right after the demand cut.
Cause: One of the two coils does not completely close the passage at the end of the cycle.
Listen for the click of both coils closing at the end of the heating demand.
Fault codes from Saunier Duval that this spare part resolves.
| Code | Fault | Diagnosis and solution |
|---|---|---|
| 15 | Gas mechanism fault. | The stepper motor/gas block module is faulty or gets stuck, and the valve does not open/modulate; check power supply to the modulation coil, continuity, and valve regulation with a manometer on the ramp. |
| 04 | Ignition fault (flame not detected). | The gas valve does not open or is poorly adjusted, and gas does not reach the burner; check that the tap and valve are open, measure 24 V~ at the valve during the ignition attempt, and verify/adjust the gas mechanism with a manometer. |
| 16 | Flame detection fault: flame present >5 s after shutdown (safety solenoid valve). | The gas solenoid valve/valve assembly does not close hermetically or remains stuck, and residual ionisation is detected; check for absence of voltage in the valve after shutdown and its tight closure (leakage test/pressure drop). |
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 gas valve Saunier Duval 05719900
- Catalogue reference
- 05719900
- 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
- Code
- VK4105M
- Printed internal code (Saunier Duval)
- SD 105432b
- Maximum Pressure (Pmax)
- 60 mbar
- Class
- B+D
- Category
- CAT.III
- Voltage V1+V2
- 220/240 Vac
- Current V1/V2
- 0.048/0.052 A
- Ambient temperature
- -15...60°C
- CE marking
- CE-0063AP3090/6
- Place of manufacture
- Made in the Netherlands
Manuals and technical documentation
Official documentation of the boiler, useful for locating the part and cross-referencing the fault codes.
- Saunier Duval Isofast F 31 E Manual (PDF)Document © Saunier Duval, provided as a technical reference.
Frequently asked questions about the gas valve 05719900
Does the Honeywell VK4105M gas valve work for the Xtrafast 120?
Where is the Honeywell VK4105M gas valve for the Isofast C 31E manufactured?
What fault does replacing the VK4105M gas valve in an Isomax F 28E resolve?
What is the maximum pressure that the valve of the Isofast F 35E can withstand?
Does the VK4105M valve of the Xtrafast 96 have one or two coils?
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