Honeywell Ignition Transformer AC1A118 - Hermann Micra Condens 26 / Master / Spazio Zero / Thesi 26-32 / Acquaplus 32
The ignition transformer generates the spark necessary to ignite the burner. This Honeywell model, reference AC1A118, is essential for the proper start-up of the boiler. When it fails, you will notice that the boiler attempts to start unsuccessfully, displaying fault code 01: ignition failure, which means that the flame does not form or goes out unexpectedly. It is installed in boilers such as the Hermann Micra Condens 26, among others. A technician should confirm through diagnosis whether it needs to be replaced if you observe recurring ignition faults.
- Type of part
- Transformers
- Status
- Refurbished
- Catalogue reference
- H052005087
- Warranty
- 1 year
Hermann boilers compatible with reference H052005087
Ignition transformer with reference H052005087. A proven compatibility: Micra Condens 26.
Proven compatibility
| Boiler model | Family | Verification |
|---|---|---|
| Hermann Micra Condens 26 | Micra Condens | Contrasted |
Can't see your model or have questions? The printed reference takes precedence. How to check it · Send us a photo via WhatsApp.
How to check if ref. H052005087 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 H052005087. 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.
Symptoms that require diagnosis in the ignition transformer H052005087
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 starts the cycle, you can hear the ignition attempt but the burner does not ignite and it locks out.
Cause: The ignition transformer does not generate enough current and the spark that ignites the gas does not occur.
Check that the ignition electrode is clean, free of soot and cracks, and that the gap with the ground is correct before considering the transformer good.
- 02
Sometimes it ignites on the first attempt and other times it takes several tries before it lights up.
Cause: The transformer winding degrades with use and delivers the spark irregularly instead of consistently.
Check the high voltage cable that goes from the transformer to the electrode: if it has cracks, burns, or a loose connector, the fault may be there and not in the transformer.
- 03
A crackling or strange buzzing sound is heard inside the boiler when trying to ignite, without any spark from the burner.
Cause: There can be an internal arc in the transformer itself, which loses the spark along the way instead of carrying it to the electrode.
With the boiler turned off and disconnected, visually inspect the body of the transformer and its connections for any signs of burning or condensed moisture.
- 04
The boiler gets locked with a ignition fault warning as soon as you try to start it.
Cause: Without ignition current at the electrode, the control board does not detect a flame and cuts off the attempt for safety.
Confirm that 230V is reaching the primary of the transformer before replacing it; if it is not, the problem may be in the PCB or the wiring, not in the transformer.
Hermann fault codes that require diagnosis
| Code | Fault | Technical checks |
|---|---|---|
| 01 | Ignition fault: the burner does not ignite normally or the flame does not form/extinguishes unexpectedly (steady red LED, lockout after several attempts). | The ignition transformer generates the spark that ignites the burner; if it is faulty, no spark occurs and the boiler locks with Error 01. Check: with the boiler in demand, verify if there is a spark at the electrode and measure the high voltage output of the transformer; rule out the electrode, cable, connector, and gas supply first, as this same code can be caused by other components of the ignition group. |
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.
Hermann Ignition Transformer Datasheet H052005087
- Catalogue reference
- H052005087
- Uniclima internal SKU
- TCMC26
- Brand
- Hermann
- Type of part
- Transformers
- Units in stock
- 7 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.
- Type
- AC1A118
- Frequency
- 50-60 Hz
- Working temperature range
- -20°C to +90°C
Frequently asked questions about the ignition transformer H052005087
Does this Honeywell AC1A118 transformer work for the Hermann Micra Condens 26?
Is it an original Hermann part or from Saunier Duval?
What code is engraved on the transformer of the Micra Condens 26?
What temperature range does this ignition transformer operate in?
Spare parts related to Hermann Micra Condens
