Askoll pump 3NK/43-1A-F Immergas – Ref. 1.020573

Boilers Immergas compatible with reference 1.020573

Immergas with reference 1.020573. A confirmed compatibility: Immergas Extra Intra Star 93A. There are other 1 models that we are still verifying.

Proven compatibility

Models pending verification

These models are associated with this reference, but we have not finished verifying them yet, so we do not consider them compatibleIf your boiler is one of them, send us a photo of the part you are going to replace and we will verify it before you purchase.

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 reference 1.020573 is the part for your boiler

The part reference, model, and equipment revision must be verified against the manufacturer's documentation.

1. Check that the label on your pump says Askoll 3NK/43-1A-F and that the PCB carries the Immergas brand.
2. Look for an Immergas code in the format 1.0xxxxx on the pump or in the breakdown of your boiler.
3. Compare the data: 52 W, 0.23 A, and capacitor of 1.7 µF.
4. If your boiler is the Extra Intra Star 93A, it is already confirmed: call us at 911 17 77 77. If it is another one, send us photos of the pump label and the PCB from the Contact section.

Symptoms that require diagnosis in the immergas 1.020573

Common symptoms and faults

• 01

  The radiators remain cold even though the boiler turns on.

  Cause: Check that the pump starts when requesting heating and that there is pressure.

• 02

  The pump makes noise or vibrates.

  Cause: Bleed the air; if it continues, the rotor or the bearings may be worn out.

• 03

  It doesn't start after the summer.

  Cause: The rotor may be seized due to limescale: without power, check if the shaft rotates.

• 04

  It is leaking water from the pump.

  Cause: Check the gaskets; if the leak comes from the body or the motor, it needs to be replaced.

• 05

  The boiler locks out due to overheating.

  Cause: It usually indicates that the water is not circulating: confirm that the pump is running and that there is no air.

• 06

  Fault code 27 on the panel of the Extra Intra Star 93A (LED 8, 60°)

  Cause: Insufficient circulation due to overheating in the primary circuit. Causes from the official table: blocked circulator or low circulation in the installation (closed valve or air).

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.

Technical sheet: Immergas 1.020573

Catalogue reference

1.020573

Uniclima internal SKU

BOM044

Brand

Immergas

Type of part

Immergas

Units in stock

0 units

Status

Refurbished

Warranty

1 year

Shipping

Delivery time shown at checkout

Return

14 days

Part data and available documentation

Contrast the label codes, PCB, and revision with the installed part; they are not necessarily equivalent references.

Power supply

230 V; 50 Hz

Marked consumption

52 W; 0.23 A

Marked capacitor

1.7 µF

Protection

IP44; TF95; Class H

Maximum pressure marked

6 bar

Inventory — Type of spare part

Pumps

Inventory — Condenser

1.7 μF

Inventory — Application indicated in inventory

Immergas EXTRA INTRA STAR 93A

Verified data — Pump

Askoll 3NK/43-1A-F (PCB with Immergas brand)

Verified data — Power

52 W · 0.23 A

Verified data — Power supply

230 V · 50 Hz

Verified data — Condenser

1.7 µF

Verified data — Protection

IP44 · insulation class H

Verified data — Water temperature

Up to 95 °C (TF95)

Verified data — Maximum pressure

6 bar

Verified data — Manufacturing

Italy (according to the label)

Verified data — Marked code

650041

Verified data — Connections and measurements

Without data: check them in your pump.

To confirm — Speeds

1 ·, Baxi Roca version

Official boiler data — Factory circulator

Askoll 3NK/43-1A-F, already with capacitor · Official Immergas brochure

Boiler data (official) — Installation pressure

Between 1 and 1.2 bar · Official control panel 3.015026

Identification — Marked designation

3NK/43-1A-F

Identification — Marked code

1.020573

Identification — Marked code

650041

Technical sheet: Power supply

230 V; 50 Hz

Technical sheet: Marked consumption

52 W; 0.23 A

Technical sheet: Marked capacitor

1.7 µF

Technical sheet: Protection

IP44; TF95; Class H

Technical sheet: Maximum marked pressure

6 bar

Inventory data — Type of spare part

Pumps

Inventory data — Condenser

1.7 μF

Inventory data — Application indicated in inventory

Immergas EXTRA INTRA STAR 93A

Pending applications to verify

• Extra Intra Star 93A (warehouse): CONFLICT. The downloaded parts list assigns the code 1.025073 to the "Circolatore Askoll" (pos. 28) and does not mention 1.020573; it also repeats 1.025073 in the bivalent heat exchanger (pos. 27). An excerpt from the same PDF, without opening, states "26 1.020573 Circolatore Askoll". Check the boiler's PCB. • Nike Star: 1 origin (: "NIKE STAR - 1.020573 / 1.024171"; investigation of #41). • Eolo Star 24 kW. Only one forum (not valid) links the 3NK/43-1A-F with an Eolo Star, and the official technical sheet states 85 W for the circulator, compared to the 52 W on the label: an indication that it has a different pump.

Registered equivalents and substitutions

1.020573 → kit de sustitución 3.021396 (IMM3021396), que vale para 1.020573 y 1.015561 . 1.020573 → Grundfos UPS 15-50 3.022577, «ex 1.024171, ex 1.020573» . Es la cadena que cita la #41: 1.020573 → 1.024171 → 3.022577. Los dos sustitutos son otras bombas: comprobar conexión y medidas antes de ofrecerlos. El mismo modelo Askoll 3NK/43-1A-F aparece en como bomba Roca (P/N 27.001.01), con 1 velocidad, 0,23 A y 52 W, como esta etiqueta (investigación de la #32). No confundir con la Askoll 3NK/43-2E-F (Savio Biasi) ni con la 3NK/43-4A-F (Baxi Roca Victoria, 07.029.01A).