Pump Rotor Housing Isofast Condens F 35 E Ref. 0020037988
If you notice leaks, pressure loss, or faults in the production of domestic hot water, you may need the pump rotor housing for the Isofast Condens F 35 E, reference 0020037988. This part is a hydraulic component responsible for directing and distributing water between the circuits of the boiler. When it fails, it can cause symptoms like those mentioned. It is compatible with various boiler models, including Isofast Condens F 35 E, Isofast Condens F 30 E, among others. It should be replaced when these problems occur or when visible damage to the housing is detected.
VAT included
Consult via WhatsAppSaunier Duval boilers compatible with reference 0020037988
Hydraulic group with reference 0020037988. 12 verified compatibilities: Isofast Condens F 35 E and Isofast Condens F 30 E.
Proven compatibility
| Boiler model | Family | Verification |
|---|---|---|
| Saunier Duval Isofast Condens F 35 E | Isofast Condens | Contrasted |
| Saunier Duval Isofast Condens F 30 E | Isofast Condens | Contrasted |
| Saunier Duval Isofast 21 Condens F 35-B | Isofast Condens | Contrasted |
| Saunier Duval Isofast 21 Condens F 25 | Isofast Condens | Contrasted |
| Saunier Duval Isofast F 30 E H-MOD | Isofast (non-condensing) | Contrasted |
| Saunier Duval Isofast F 35 EA | Isofast (non-condensing) | Contrasted |
| Saunier Duval Isofast F35E H-MOD | Isofast (non-condensing) | Contrasted |
| Saunier Duval Themafast Condens F 24E | Themafast Condens | Contrasted |
| Saunier Duval Themafast Condens F 30E | Themafast Condens | Contrasted |
| Saunier Duval Themafast Condens F 30 H-MOD | Themafast Condens | Contrasted |
| Saunier Duval Themafast F 30 E H-MOD | Themafast | Contrasted |
| Saunier Duval Themafast F 25 E H-MOD | Themafast | 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. 0020037988 is the part 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 0020037988. 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 hydraulic group 0020037988 resolves.
The hydraulic group includes the valve, the by-pass, and the water connections. These are the typical symptoms and what to do:
Common symptoms and faults
- 01
The pump is buzzing or trying to start but is not spinning.
Cause: the rotor rubs or gets stuck against the walls of the casing due to accumulated scale
remove the casing and try to turn the rotor by hand; if it turns freely, the problem may be elsewhere in the assembly
- 02
Water is appearing at the base of the pump, where the casing is mounted.
Cause: the sealing gasket of the casing cracks or deforms over time and stops sealing properly
Dry the area, tighten the mounting screws, and observe for a day before confirming that the leak persists.
- 03
A rubbing or rattling noise is heard when starting the pump.
Cause: the rotor hits against a deformed casing or with limescale deposits
Check if the noise changes when bleeding the air from the circuit; a noise that disappears when bleeding does not come from the casing.
Fault codes from Saunier Duval that this spare part resolves.
| Code | Fault | Diagnosis and solution |
|---|---|---|
| F.75 | The control does not detect an increase in pressure when the pump starts (lack of water/pressure or pump/sensor fault). | If the circulator (block 0020037988) is blocked, does not start, or does not respond, the pressure sensor does not detect the expected increase and the boiler locks out with F.75; check electrical/PWM start-up, consumption, and that the rotor spins after bleeding. |
| F.23 | Safety shutdown due to excessive temperature difference between flow and return. | A blocked pump or one working at minimum power prevents circulation, increases the ΔT, and triggers F.23; check that the circulator is rotating, its consumption and flow rate, and bleed the primary. |
| F.24 | Safety shutdown due to excessively rapid temperature rise. | If the circulator of block 0020037988 is seized or has insufficient power, the water does not dissipate heat and the temperature rises quickly; check the pump's rotation/consumption, PWM signal, and bleed the circuit. |
| F.20 | Safety shutdown of the temperature limiter (overheating). | The lack of circulation due to a blocked pump in block 0020037988 causes overheating in the heat exchanger; check the start and flow of the circulator, free the shaft if it is seized, and bleed. |
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 hydraulic group 0020037988
- Catalogue reference
- 0020037988
- Brand
- Saunier Duval
- Type of part
- Hydraulics
- Units in stock
- 1 unit
- Status
- Refurbished
- Warranty
- 1 year
- Shipping
- 1-2 business days
- 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 Isofast 21 Condens F 35-B Manual (PDF)Document © Saunier Duval, provided as a technical reference.
Frequently asked questions about the hydraulic group 0020037988
Is the pump rotor housing of the Isofast Condens F 35 E compatible with the Isofast Condens F 30 E?
Does the rotor housing of the Isofast Condens F 35 E fit the Isofast 21 Condens F 35-B?
How many models are compatible with the pump rotor casing of the Isofast Condens F 35 E?
What fault codes are documented for this casing?
Is the reference for this casing HBWIF35E?
Spare parts related to Saunier Duval Isofast Condens
