Saunier Duval Themafast C 28 E Heating Circulating Pump Ref. S1005500
When the heating starts, the Saunier Duval Themafast C 28 E Heating Circulation Pump is responsible for moving water through the heating circuit. If this pump fails, you will notice cold radiators, strange noises, overheating, or blockages due to lack of circulation. It is compatible with models from the ThemaClassic range, such as the ThemaClassic F AS 30 A, among others. It is recommended to replace it when these symptoms occur or in case of faults like F.23, F.24, or F.75.
VAT included
Consult via WhatsAppSaunier Duval boilers compatible with reference S1005500
Circulating pump with reference S1005500. A proven compatibility: ThemaClassic F AS 30 A.
Proven compatibility
| Boiler model | Family | Verification |
|---|---|---|
| Saunier Duval ThemaClassic F AS 30 A | ThemaClassic | 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 the part S1005500 is the one for your boiler
What determines it is not the boiler model, but the reference printed on the part you already have installed.
- Find the reference printed on the installed part and check whether it matches the catalogue reference S1005500. 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 and faults that the circulator pump S1005500 resolves.
The circulation pump circulates the water in the heating circuit. These are the typical symptoms and what to do:
Common symptoms and faults
- 01
The pump does not spin or start.
Cause: The rotor is stuck, something common after months of inactivity.
Try to free the shaft with a screwdriver through the rear slot before purchasing a new one.
- 02
Noise or vibration when turning on the heating
Cause: The rotor rubs while turning or there is trapped air in the pump.
Bleed the air through the front bleed screw of the pump.
- 03
The heating takes a long time to warm up or does not heat.
Cause: Without sufficient circulation, the heat remains close to the boiler and does not reach the radiators.
Measure the pressure of the circuit on the manometer: low pressure also hinders circulation.
- 04
Water leak from the pump body
Cause: The mechanical seal of the shaft wears out over time and allows water to pass through.
Check if the humidity is coming directly from the shaft or from a nearby joint before replacing the pump.
Fault codes from Saunier Duval that this spare part resolves.
| Code | Fault | Diagnosis and solution |
|---|---|---|
| F.23 | Safety shutdown: excessive temperature variation. | The circulator pump (S1005500) blocked or with reduced power does not move flow and the ΔT supply/return spikes; check by forcing the pump to run, confirming vibration/consumption, and that the ΔT decreases after bleeding. |
| F.24 | Safety shutdown: temperature increase too rapid. | If the pump is seized or not delivering flow, the primary heats up very quickly; check by forcing the pump to start, measuring ΔT, and confirming power supply and pump rotation. |
| F.75 | Pump error, lack of water. | Upon startup, the electronics await a pressure pulse generated by the pump; if the pump (S1005500) does not start or is faulty, this increase is not detected and F.75 is triggered. Check the supply voltage and ensure that the pressure momentarily rises at the beginning. |
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.
Data sheet for the Saunier Duval S1005500 circulation pump.
- Catalogue reference
- S1005500
- Brand
- Saunier Duval
- Type of part
- Pumps
- Units in stock
- 7 units
- Status
- Refurbished
- Warranty
- 1 year
- Shipping
- Delivery time shown at checkout
- Return
- 14 days
Manuals and technical documentation
Official documentation of the boiler, useful for locating the part and cross-referencing the fault codes.
- Saunier Duval ThemaClassic F AS 30 A Manual (PDF)Document © Saunier Duval, provided as a technical reference.
Frequently asked questions about the S1005500 circulation pump.
Does this pump work for both the Themaclassic C28E and the Themaclassic C30E-A?
When does the pump of the Themafast F30E fail and need to be replaced?
Spare parts related to Saunier Duval ThemaClassic
