How do I know if this ignition transformer is for my boiler?

Verify the reference 61002105-20 printed and ensure your model is on the list of compatible ones; also compare the connections with the original part. It is an ITW piece (BW12026 / ZAG2V).

The ignition transformer generates the high voltage for the electrode spark.

Is there no spark or repeated ignition faults?

No spark at the electrode despite having gas.

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

Check the electrode and the high voltage cable.

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.

What does the 70-80 code mean on Chaffoteaux?

Safety function due to ignition failure (flame not detected). The TIG 35 HP ignition transformer does not deliver high voltage to the electrode and there is no spark, causing the boiler to enter ignition lockout. Check that the primary receives ~230 V during the attempt and that there is no spark/HT output; if there is voltage in the primary and no spark, the transformer is faulty.

RefurbishedChaffoteaux Transformers

Chaffoteaux Ignition Transformer TIG 35 HP Ref. 61002105 20

Ref. 61002105-20

25 €VAT includedIn stock · 5 units

Ignition transformer: refurbished spare part that generates high voltage for the electrode spark. Useful if there is no spark or ignition faults are recurring. Compatible with Calydra 23 CF/FF (N/P), Calydra 28 CF/FF (N/P), Calydra VMC 23 (ref. 61002105-20). Includes a one-year warranty and delivery within 2–4 working days in the EU.

Consult via WhatsApp

Not sure if it's your part? Send us a photo of the screen printing via WhatsApp and we'll confirm compatibility before you purchase.

Delivery in 2–4 working days

1-year warranty

14-day return

Technical support

Key Data

Reference: 61002105-20
Brand: Chaffoteaux
Type of part: Transformers
Available units: 5 units in stock
Status: Refurbished
Warranty: 1 year
Shipping: 2–4 working days (EU)
Return: 14 days

The same part (ref. 61002105-20) equips these models. Verified compatibility; check the reference before purchasing.

Calydra

Calydra 23 CF/FF (N/P)
Calydra 28 CF/FF (N/P)
Calydra VMC 23
Calydra Delta 24 CF/FF/VMC
Calydra Delta 28 CF/FF
Calydra Green 24
Calydra Green 30

Nectra

Nectra 1.23
Nectra 2.23
Nectra 2.28

Elexia

Elexia Comfort 24 CF/FF
Elexia II 2.23 CF/FF

Hyxia

Hyxia 23 VMC/FF
Hyxia 28 CF/FF

Centora

Centora 2.24
Centora 2.28
Centora 3.24
Centora Green 2.24

Look

Mira Comfort 24/30
Mira Green 24/30/35

Niagara

Niagara C
Niagara Delta
Niagara Green 24

Aludra Delta

Aludra Delta 24 CF/FF
Aludra Delta 28 FF

Celtic

Celtic 1.23
Celtic 2.23
Celtic Turbo 2.20

Talia Green

Talia Green System

Pigma Green

Pigma Green 25/30/35

Urbia Green

Urbia Green 25/30/35

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.

Code	What does it mean?	Cause and diagnosis (this part)
70-80	Safety function due to ignition failure (flame not detected).	The TIG 35 HP ignition transformer does not deliver high voltage to the electrode and there is no spark, causing the boiler to enter ignition lockout. Check that the primary receives ~230 V during the attempt and that there is no spark/HT output; if there is voltage in the primary and no spark, the transformer is faulty.

How do I know if this ignition transformer is for my boiler?: Verify the reference 61002105-20 printed and ensure your model is on the list of compatible ones; also compare the connections with the original part. It is an ITW piece (BW12026 / ZAG2V).
What is it used for?: The ignition transformer generates the high voltage for the electrode spark.
Is there no spark or repeated ignition faults?: No spark at the electrode despite having gas.
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: Check the electrode and the high voltage cable.
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.