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Vaillant thermocouple + TTB MAG9/2XZ-DGXZ-B
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Vaillant thermocouple + TTB MAG9/2XZ-DGXZ-B 171016

€ 70.37 incl. VAT

Original spare part Vaillant. Type: Thermocouple, 171001. Application: Water heater / MAG 9/2 XZ Open. Supplier code: 171016.

SKU: 8055090 Categories: , Brand:

Price and stock checked on 20 October 2026.

✓ In stock — delivery usually within 3–5 working days
EU delivery from € 17.95 · Shipping & payment

Price incl. VAT. Any delivery costs are calculated in the basket — see shipping & delivery.

Does this fit my appliance?
ApplicationWater heater
Series / modelMAG 9/2 XZ Open and 1 other model
Vaillant number171016
Article number8055090
Not sure? Search by article or manufacturer number or check with the manufacturer or your installer.
All spare parts for Vaillant MAG 9/2 XZ Open →
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Vaillant thermocouple + TTB MAG9/2XZ-DGXZ-B: original Vaillant spare part, type: Thermocouple. Application: Water heater (MAG 9/2 XZ Open). Manufacturer number: 171016; Instalpunt article number: 8055090.

According to the Vaillant parts lists, this part fits 2 models, including Vaillant MAG 9/2 XZ Open and Vaillant MAG CAR 9/1 XZ Open. The full list is under “Fits”.

In stock: order before 14:00 and it ships the same working day; delivery within the EU usually takes 3–5 working days.

Check the rating plate of your appliance before ordering; if in doubt, ask the manufacturer or your installer. Work on gas-carrying parts must be carried out by a qualified gas engineer.

Product information: Vaillant thermocouple + TTB MAG9/2XZ-DGXZ-B 171016

BrandVaillant spare parts
Vaillant manufacturer number171016
Instalpunt article number8055090
EAN4024074380413
Also known as171001
Part typeThermocouple (All Vaillant thermostats and controls · thermostats and controls of all brands)
ApplicationWater heater
Suitable for2 Vaillant models (see list)
DeliveryIn stock, delivery in 3–5 working days
Price€ 70,37 incl. VAT
OriginSupplied through the official technical wholesale channel, under Vaillant number 171016

Fits 2 Vaillant models

The part Vaillant thermocouple + TTB MAG9/2XZ-DGXZ-B 171016 is in the official parts list of these Vaillant appliances. Click a model for the complete parts list.

Vaillant Water heater (2)

Check the rating plate of your appliance. Not sure whether this part fits? Check with the manufacturer or your installer; with the correct manufacturer number you can order it here directly.

For which fault is a Vaillant thermocouple replaced?

According to the fault code database, these Vaillant fault codes point to this type of part. Always check first that the code matches the appliance type on the rating plate.

CodeWhat is going on
F.279The hot gas thermostat switches the heat pump off if the pressure in the refrigerant circuit is too high. After a waiting time the heat pump makes another start attempt. After three consecutive failed start attempts an error is displayed. Refrigerant circuit temperature max.: 130 °C. Waiting time: 5 min (after the first occurrence). Waiting time: 30 min. (after the second and each subsequent occurrence). Error counter reset when both conditions are met: heat demand without premature switch-off. 60 min of trouble-free operation.

All Vaillant fault codes explained

Indicative: the same code can have a different cause depending on the situation. Have work on gas, flue or burner adjustment carried out by a qualified installer.

Frequently asked questions about this item

Does the Vaillant thermocouple + TTB MAG9/2XZ-DGXZ-B 171016 fit my appliance?
This part is in the parts list of 2 Vaillant models, namely the MAG 9/2 XZ Open, MAG CAR 9/1 XZ Open. The model type is on the rating plate of your appliance. If in doubt, ask the manufacturer or your installer.
What is the delivery time for the Vaillant thermocouple + TTB MAG9/2XZ-DGXZ-B 171016?
This item is in stock. Ordered before 14:00, it ships the same working day and usually arrives within three to five working days.
Can I return this item?
Yes, unused and in the original packaging within 14 days of receipt. Unpacked or fitted items and electronics such as PCBs cannot be returned. How to register a return is explained on returns.
What does shipping cost?
Shipping costs € 17.95 to Austria, Denmark, Italy, Spain and Sweden and € 24.95 to other EU countries. In-stock items ordered before 2 pm are dispatched the same working day; delivery usually takes 3–5 working days. Details: Shipping.
I have a fault code, which part do I need?
Look up the code in the fault code finder: per brand and appliance it shows what the code means and which part goes with it. If the code is listed with this part, the part belongs to that fault.

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