Hydraulic Duct Elbow Themaplus C 23 E Ref. 0020037988
Themaplus C 23 E Hydraulic Duct Elbow Ref. 0020037988 is a hydraulic component that conducts and distributes water between the circuits of the boiler. When it fails, you may notice leaks, loss of pressure, or issues with hot water production. This elbow is compatible with boilers from the Isofast Condens, Isofast, and Themafast ranges, such as the Isofast Condens F 35 E, Themafast F 30 E H-MOD models, among others. It is recommended to replace it upon detecting symptoms such as fault codes F.75, F.23, F.24, or F.20.
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
A puddle or a ring of water appears at the base of the boiler, near the pipes.
Cause: This elbow conducts pressurized water between components; if it cracks or the joint loses its seal, it leaks right at that section.
With the boiler cold and without pressure, check if the elbow has cracks, discoloration, or lime deposits on the fittings before replacing it.
- 02
The boiler loses pressure over time and the circuit needs to be refilled every few weeks.
Cause: A small leak in this duct is only noticeable when the boiler is hot and under pressure, and it dries up when it cools down without leaving a visible puddle.
Run your dry hand around the elbow with the boiler running for a few minutes to detect moisture that isn't visible to the naked eye.
- 03
A whistling or water jet sound is heard with the boiler on, although there is no visible leak outside.
Cause: The plastic of the elbow has deformed due to heat and has lost its fit with the gasket, allowing pressurized water to pass through.
Locate the source of the noise with the cover open and the boiler running before deciding which part to replace.
- 04
After an intervention on nearby parts, the boiler started leaking water from that area.
Cause: It is a plastic part sensitive to impacts or twisting when handling nearby pipes, and it can crack when disassembling other parts.
Check if the elbow suffered any impact or stress during the last intervention before considering it defective from the factory.
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
Frequently asked questions about the hydraulic group 0020037988
Is this elbow a pump body for my Themaplus C 23 E?
Is this elbow compatible with the Isofast Condens range?
Can I use this elbow on a Themafast boiler?
What is the reference for this elbow?
What fault codes are documented for this product?
How many models are compatible with this elbow?
Spare parts related to Saunier Duval Isofast Condens
