Ignition Transformer ZIG 2 - Saunier Duval Isofast Condens F30 B 1 - Ref. A000035144

Ignition transformer code ZIG 2, variant SD, for Saunier Duval boilers. It generates the high voltage spark that ignites the burner. It operates at 300 V / 20 kHz with a maximum temperature of 80°C, and its connector has 4 pins: positive, flame, ignition, and ground. The manufacturer of the part is not confirmed in this sheet. The replacement requires first confirming the fault of the part through technical diagnosis, even when the boiler does not ignite or the spark fails.

Type of part: Transformers
Status: Refurbished
Catalogue reference: A000035144
Warranty: 1 year

VAT included Stock · 3 units

Compatibility

Saunier Duval boilers compatible with reference A000035144

Ignition transformer with reference A000035144. 11 verified compatibilities: Isofast Condens F 30 E and Isofast Condens F 35 E.

Proven compatibility

Boiler model	Family	Verification
Saunier Duval Isofast Condens F 30 E	Saunier Duval	Contrasted
Saunier Duval Isofast Condens F 35 E	Saunier Duval	Contrasted
Saunier Duval Isofast 21 Condens F 25	Saunier Duval	Contrasted
Saunier Duval Isofast 21 Condens F 30 B	Saunier Duval	Contrasted
Saunier Duval Thema Condens F 18 E	Saunier Duval	Contrasted
Saunier Duval Thema Condens F 24 E	Saunier Duval	Contrasted
Saunier Duval Thema Condens F 30 E	Saunier Duval	Contrasted
Saunier Duval Themaplus Condens F 30 E	Saunier Duval	Contrasted
Saunier Duval Isotwin Condens F 35 E	Saunier Duval	Contrasted
Saunier Duval Enviroplus F 24 E	Saunier Duval	Contrasted
Saunier Duval Enviroplus 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.

Guide

How to check if ref. A000035144 is the part for your boiler

The part reference, model, and equipment revision must be verified against the manufacturer's documentation.

Find the reference printed on the installed part and check whether it matches the catalogue reference A000035144. 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.

Diagnosis and fault codes

Symptoms that require diagnosis in the ignition transformer A000035144

The ignition transformer generates the high voltage for the spark of the electrodes. These are the typical symptoms and what to do:

Common symptoms and faults

01
The boiler does not ignite and no spark is observed at the electrode when trying to start.
Cause: The transformer does not generate the high voltage necessary for the spark to jump at the electrode.
Check that the 4-pin connector is properly seated and free of oxidation before considering the transformer faulty.
02
The ignition is intermittent: sometimes it lights and sometimes it doesn't.
Cause: The transformer delivers voltage irregularly, which is common when the internal winding degrades due to heat.
Check that the electrode does not have a worn tip and that the spark gap is not too wide, as this can cause the same symptom without the transformer failing.
03
The spark can be heard, but it sounds weak or different from usual.
Cause: An insufficient output voltage in the transformer produces a weak spark that does not always ignite the mixture.
Check that the ceramic insulator of the electrode is not cracked; a ground leak there also weakens the spark.
04
The boiler starts up well when cold but stops doing so after a while of operation.
Cause: The transformer can fail due to temperature when it heats up, as it operates close to its thermal limit of 80°C.
Check that the combustion chamber ventilation is not obstructed, as accumulated heat accelerates this type of fault.

Fault codes Saunier Duval that require diagnosis

Code	Fault	Technical checks
F.28	Start-up fault: ignition failed	If the ignition transformer is faulty, no spark is generated at the electrodes and the burner does not ignite. Check for the presence of a spark during start-up and measure the power supply to the transformer and high voltage output/insulation along with wiring and grounding.
F.29	Operating fault: failed ignition attempts	A faulty or intermittent ignition transformer causes spark failures during retries and the boiler locks out with F.29. Check for sustained spark in each attempt, continuity/output of the transformer, and the condition of ignition and ground cables.

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.

Technical data

Saunier Duval Ignition Transformer Datasheet A000035144

Catalogue reference: A000035144
Uniclima internal SKU: TCICF30
Brand: Saunier Duval
Type of part: Transformers
Units in stock: 3 units
Status: Refurbished
Warranty: 1 year
Shipping: Delivery time shown at checkout
Return: 14 days

Part data and available documentation

Contrast the label codes, PCB, and revision with the installed part; they are not necessarily equivalent references.

Model code: ZIG 2
Variant: SD
Voltage / Frequency: 300 V / 20 kHz
Maximum temperature: 80 °C
Pin assignment of the connector: 1 (+), 2 (flame), 3 (ignition), 4 (- / ground)

Documentation

Manuals and technical documentation

Official documentation of the boiler, useful for locating the part and cross-referencing the fault codes.

Saunier Duval Isofast Condens F 30 E Manual (PDF) Document © Saunier Duval, provided as a technical reference.

Frequently Asked Questions

Frequently asked questions about the ignition transformer A000035144

How do I check if this ZIG 2 transformer is the one for my boiler?

Checking the label for the short code 'ZIG 2' and the variant 'SD'.

Is the ZIG 2 transformer Ref. A000035144 suitable for a Saunier Duval Isofast Condens F 30 E?

Yes, Isofast Condens F 30 E is on the list of compatible boilers, along with other models.

What voltage and temperature does the ZIG 2 transformer support?

It supports 300 V / 20 kHz, with a maximum temperature of 80°C, according to the label.

What does each pin of the ZIG 2 transformer connector do?

It has 4 pins: positive, flame, ignition, and ground.

How many boiler models are compatible with the ZIG 2 transformer?

The ZIG 2 transformer is compatible with a total of 11 models of Saunier Duval boilers.

What fault codes are documented for this transformer?

The documented fault codes are F.28 and F.29.

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Ignition Transformer ZIG 2 - Saunier Duval Isofast Condens F30 B 1 - Ref. A000035144