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A.O. Smith ignition electrode
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A.O. Smith ignition electrode 0303685(S)

€ 42.60 incl. VAT

Original spare part A.O. Smith. Type: Electrode, Ignition. Application: Hot water cylinder / BTI 100. Supplier code: 0303685(S).

SKU: 8750347 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?
ApplicationHot water cylinder
Series / modelBTI 100 and 2 other models
A.O. Smith number0303685(S)
Article number8750347
Not sure? Search by article or manufacturer number or check with the manufacturer or your installer.
All spare parts for A.O. Smith BTI 100 →
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A.O. Smith ignition electrode: original A.O. Smith spare part, type: Electrode, Ignition. Application: Hot water cylinder (BTI 100). Manufacturer number: 0303685(S); Instalpunt article number: 8750347.

According to the A.O. Smith parts lists, this part fits 3 models, including A.O. Smith BTI 65, A.O. Smith BTI 85 and A.O. Smith BTI 100. 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.

Product information: A.O. Smith ignition electrode 0303685(S)

BrandA.O. Smith spare parts
A.O. Smith manufacturer number0303685(S)
Instalpunt article number8750347
EAN8717449195908
Part typeElectrode (All A.O. Smith ignition and ionisation · ignition and ionisation of all brands)
ApplicationHot water cylinder
Suitable for3 A.O. Smith models (see list)
DeliveryIn stock, delivery in 3–5 working days
Price€ 42,60 incl. VAT
OriginSupplied through the official technical wholesale channel, under A.O. Smith number 0303685(S)

Also known as: ontstekingselektrode, ontsteekpen, ontstekingspen.

Fits 3 A.O. Smith models

The part A.O. Smith ignition electrode 0303685(S) is in the official parts list of these A.O. Smith appliances. Click a model for the complete parts list and exploded view.

A.O. Smith Hot water cylinder (3)

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.

Position on the parts diagram

This spare part is shown as position 9 on the parts drawing. Open the drawing for the appliance and click the number to check that you have the right spare part.

For which fault is a A.O. Smith electrode replaced?

According to the fault code database, these A.O. Smith 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
F01Fout in voedingscircuit: Condens op de ionisatiepen.
F04Three unsuccessful ignition attempts: fault in the glow igniter circuit
F06Contact with a metal surface due to a broken cable or deformed ionisation pin.
F08Ionisation fault: defective safety relay
XB2-XXXX(Lockout fault) Ignition fault - three failed ignition attempts: no gas

All A.O. Smith 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 A.O. Smith ignition electrode 0303685(S) fit my appliance?
This part is in the parts list of 3 A.O. Smith models, namely the BTI 65, BTI 85, BTI 100. 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 A.O. Smith ignition electrode 0303685(S)?
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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