Pressure Gauge Heat Line HK B124

Compatible Airsol boilers

Manometer. 19 confirmed compatibilities: 25 and 25S.

Verified compatibility

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 it is the part for your boiler

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

1. Find the reference printed on the installed part and check whether it matches the catalogue reference —. If it is not visible, do not identify the part by its shape alone.
2. Check the full boiler model on its data plate and look for it in the model associations on this page.
3. Compare the connections and physical body with the original part before installation.
4. If anything is unclear, send us a photo of the marking via WhatsApp before placing your order.

Symptoms that require diagnosis on the manometer

The manometer shows the pressure of the boiler circuit. These are the typical symptoms and what to do:

Common symptoms and faults

• 01

  The manometer shows nothing, the needle is completely stuck at zero.

  Cause: The spiral capillary may be bent, crushed, or have lost its internal fluid, which prevents the needle from moving even if there is actual pressure.

  Visually check that the capillary is not bent, crushed, or rubbing against other pipes before declaring the part as broken.

• 02

  I see a droplet or stain of moisture right on the spiral of the thin tube that comes out of the pressure gauge.

  Cause: A leak in the capillary, which is the most fragile part, can gradually empty the measuring chamber.

  Dry the area of the capillary, turn on the boiler, and observe for a few minutes to see if the moisture reappears before replacing the part.

• 03

  The needle moves but stops right at the red arc, even though I have bled and refilled it properly.

  Cause: If the mechanism is jammed, it gets stuck in the red arc instead of reflecting the actual pressure.

  Check the actual pressure of the circuit with another reference point if available, and do not force more filling thinking that water is missing.

• 04

  Nothing is visible on the dial, the numbers have faded or the glass is broken.

  Cause: It is a physical wear of the part, not a pressure fault of the circuit, and it does not explain any fault of the boiler.

  Confirm that the issue is only with the reading, damaged dial or glass, and that there are no warnings or lockouts in the boiler due to actual low pressure.

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.

Airsol pressure gauge data sheet

Uniclima internal SKU

MAPHEA

Brand

Airsol

Type of part

Pressure gauges & aquastats

Units in stock

3 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.

Pressure scale / range

0-4 bar approximately, with red arcs at the ends

Type of connection

Spiral capillary