Saunier Duval Hydraulic Block Pump Isofast Condens F 35 E Ref. 0020037988
RefurbishedSaunier DuvalHydraulics

Saunier Duval Hydraulic Block Pump Isofast Condens F 35 E Ref. 0020037988

30 €VAT includedIn stock · 5 units

Hydraulic group: reconditioned spare part that integrates the valve, bypass, and water connections. Useful if there are leaks, noises, or poor water circulation. Compatible with Isofast Condens F 35 E, Isofast Condens F 30 E, Isofast 21 Condens F 35-B (ref. 0020037988). Includes a one-year warranty and delivery within 2–4 working days in the EU.

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Delivery in 2–4 working days
1-year warranty
14-day return
Technical support

Key Data

Reference
0020037988
Brand
Saunier Duval
Type of part
Hydraulics
Available units
5 units in stock
Status
Refurbished
Warranty
1 year
Shipping
2–4 working days (EU)
Return
14 days

The same part (ref. 0020037988) equips these models. Verified compatibility; check the reference before purchasing.

Isofast Condens

  • Isofast Condens F 35 E
  • Isofast Condens F 30 E
  • Isofast 21 Condens F 35-B
  • Isofast 21 Condens F 25

Isofast (non-condensing)

  • Isofast F 30 E H-MOD
  • Isofast F 35 EA
  • Isofast F35E H-MOD

Themafast Condens

  • Themafast Condens F 24E
  • Themafast Condens F 30E
  • Themafast Condens F 30 H-MOD

Themafast

  • Themafast F 30 E H-MOD
  • Themafast F 25 E H-MOD

Fault codes related to this part (not the entire boiler). They usually have more possible causes: first rule out electrodes, wiring/connections, and gas supply. Verified with ≥3 sources.

CodeWhat does it mean?Cause and diagnosis (this part)
F.75The 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.23Safety 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.24Safety 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.20Safety 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.
How do I know if this hydraulic group/block is for my boiler?
Verify the reference 0020037988 printed and ensure your model is on the list of compatible ones; also compare the connections with the original part.
What is it used for?
The hydraulic group/block integrates the water circuit (valve, by-pass, and connections).
Leaks, noises, or poor water circulation?
It may indicate leaks or wear of the block.
Which models is it suitable for?
Part shared by various models (see Compatibility). If your model does not appear, send us a photo of the marking and we will confirm it.
Installation and recommendations
Check seals and connections; compare the exploded view.
What does refurbished mean and what coverage does it have?
Part removed from a boiler out of service, inspected and tested. Includes 1-year warranty and 14-day return policy. Delivery within 2–4 working days in the EU.

Related Spare Parts Boiler Hydraulic Pump Isofast Condens F 35 E

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