Saunier Duval Isofast C 28 E1 Grundfos Circulating Pump Ref. 05720700
RefurbishedSaunier DuvalPumps

Saunier Duval Isofast C 28 E1 Grundfos Circulating Pump Ref. 05720700

75 €VAT includedIn stock · 4 units

Circulating pump: refurbished spare part that circulates water in the heating circuit. Useful if there is noise, water is not circulating, or radiators do not heat evenly. Compatible with Isofast C 28 E, Isofast C 28 E1, Isofast F 28 E (ref. 05720700). Includes a one-year warranty and delivery within 2–4 working days in the EU.

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

Key Data

Reference
05720700
Brand
Saunier Duval
Type of part
Pumps
Available units
4 units in stock
Status
Refurbished
Warranty
1 year
Shipping
2–4 working days (EU)
Return
14 days

The same part (ref. 05720700) equips these models. Verified compatibility; check the reference before purchasing.

Isofast

  • Isofast C 28 E
  • Isofast C 28 E1
  • Isofast F 28 E
  • Isofast F 28 E1

Isomax

  • Isomax C 28 E
  • Isomax C 28 E2
  • Isomax F 28 E
  • Isomax F 28 E2

Isotwin

  • Isotwin C 24 EA
  • Isotwin F 24 E
  • Isotwin F 24 EA

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)
11Circulation pump blocked.The pump (circulator) is seized or not turning; the control detects a pump blockage. Verify by applying voltage to the pump and checking consumption/rotation (unblocking via front screw) and ensure it receives 230 V when there is demand.
05Overheating of the heating circuit.If the pump does not move the water (blocked/faulty or with air), the flow temperature rises very quickly and the limiter activates, causing 05. Check the pump's start-up and flow (noise/vibration, ΔT flow/return) and bleed the circuit; measure voltage at the pump during demand.
How do I know if this circulating pump is the one for my boiler?
Verify the reference 05720700 printed and ensure your model is on the list of compatible ones; also compare the connections with the original part. It is a Grundfos piece.
What is it used for?
The circulating pump circulates the water through the heating circuit.
Noise, water not circulating, or cold radiators?
Typical symptoms: humming, seized rotor after a long stop, or radiators that do not heat evenly.
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
Bleed the air from the circuit and the pump; check the pressure at 1–1.5 bar with the boiler cold.
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.

Spare Parts Related Boiler Isofast C 28 E1 Grundfos

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