Hermann Saunier Duval Micraplus NOx Gas Valve Ref. 0020039188
RefurbishedHermannGas valves

Hermann Saunier Duval Micraplus NOx Gas Valve Ref. 0020039188

45 €VAT includedIn stock · 1 unit

Gas valve: refurbished spare part that regulates and modulates the gas flow to the burner. Useful if there are ignition faults or the flame does not modulate. Compatible with Micraplus NOX 24, Micraplus NOX 24-B-2, Thema NOX F25 (ref. 0020039188). Includes a one-year warranty and delivery within 2–4 working days in the EU.

1
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Delivery in 2–4 working days
1-year warranty
14-day return
Technical support

Key Data

Reference
0020039188
Brand
Hermann
Type of part
Gas valves
Available units
1 unit in stock
Status
Refurbished
Warranty
1 year
Shipping
2–4 working days (EU)
Return
14 days

The same part (ref. 0020039188) equips these models. Verified compatibility; check the reference before purchasing.

Hermann Micraplus NOx

  • Micraplus NOx 24
  • Micraplus NOx 24-B-2

Saunier Duval Thema NOx

  • Thema NOx F25
  • Thema NOx F25-B

Saunier Duval Themafast NOx

  • Themafast NOx F25
  • Themafast NOx F30

Saunier Duval Isotwin

  • Isotwin C25
  • Isotwin F25

Fault codes related to this part (not the entire boiler). They usually have more possible causes: first rule out electrodes, wiring/connections, and gas supply. Verified with ≥3 sources.

CodeWhat does it mean?Cause and diagnosis (this part)
F.26Fault: gas valve not functioning.The stepper motor of the gas valve (0020039188) is disconnected/faulty or there is a break in the harness; check the continuity of coils and wiring, and control voltage; if it does not operate, replace the gas valve.
F.61Gas valve activation fault.Short circuit to ground in coils or defective gas valve causes switching fault; check harness to the valve, coil resistance, and activation signal; if there is a leak or coils are out of tolerance, replace the valve.
F.62Gas valve fault. Disconnection delay.The valve remains open or leaks (not sealed) and closes with delay; check the tightness of the valve assembly (leak test) and observe the flame signal shutdown; if delay/leak is confirmed, replace the valve.
F.28Start-up fault: ignition failed.Incorrect/defective gas valve prevents flow/opening during ignition; check inlet pressure, adjustment, and operation of the valve during start-up attempt (and combustion parameters).
How do I know if this gas valve is the one for my boiler?
Verify the reference 0020039188 printed and ensure your model is on the list of compatible ones; also compare the connections with the original part. It is a Honeywell piece.
What is it used for?
The gas valve regulates and modulates the gas flow to the burner.
Ignition faults, does not modulate, or smells of gas?
It could be the gas valve. IMPORTANT: gas handling ONLY by an authorised technician.
Which models is it suitable for?
Part shared by various models (see Compatibility). If your model does not appear, send us a photo of the marking and we will confirm it.
Installation and recommendations
Installation and pressure adjustment by authorised technician; mandatory leak check.
What does refurbished mean and what coverage does it have?
Part removed from a boiler out of service, inspected and tested. Includes 1-year warranty and 14-day return policy. Delivery within 2–4 working days in the EU.

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