Pressure Gauge Set Drain Key Fagor FE 25 NOx

Compatible Fagor boilers

Manometer. Three confirmed compatibilities: NOX/1 B and NOX/1 N.

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 needle of the pressure gauge does not move; it remains stuck at a fixed value no matter what happens.

  Cause: The internal mechanism of the manometer deforms with pressure; if it gets stuck or breaks, the needle remains fixed even if the actual pressure changes.

  Bleed a radiator or briefly open the filling valve to force a real pressure change and see if the needle reacts before replacing the pressure gauge.

• 02

  The reading on the manometer does not match what it should: it shows very high or very low compared to what is usual in your boiler.

  Cause: A miscalibrated pressure gauge or one with a damaged mechanism gives incorrect readings even if the actual pressure of the system is correct.

  If you have another reference point, compare readings before assuming that the installation has a real pressure problem.

• 03

  There is humidity, mist, or water droplets inside the glass of the pressure gauge itself.

  Cause: If the internal gasket of the manometer fails, moisture from the circuit can enter and fog the reading.

  Check that there is no water leak near the pressure gauge that is wetting the area from the outside before declaring the part damaged internally.

• 04

  The pressure gauge is broken or cracked on the outside, or the needle has come off its axis.

  Cause: A sudden impact or a momentary overpressure can crack the glass or dislodge the needle from its mechanism, and from that point on, the reading is no longer reliable.

  Before purchasing, measure the thread diameter and check the scale (bar) of your current pressure gauge to avoid ordering one that doesn't fit or doesn't read the range you need.

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.

Fagor pressure gauge datasheet

Uniclima internal SKU

CMLVNOX1N

Brand

Fagor

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 gauge

0-4 bar / 0-50 psi

Manuals and technical documentation

Official documentation of the boiler, useful for locating the part and cross-referencing the fault codes.

• Fagor NOX/1 B manual (PDF) Document © Fagor, provided as a technical reference.