Vaillant VCW 240 Boiler Thermometer

Vaillant boilers compatible with reference 101542

Pressure gauge with reference 101542. 21 confirmed compatibilities: VCW 240 and VCW 242.

Proven 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 ref. 101542 is the part for your boiler

What determines it is not the boiler model, but the reference printed on the part you already have installed.

1. Find the reference printed on the installed part and check whether it matches the catalogue reference 101542. If it is not visible, do not identify the part from 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 and faults that the pressure gauge 101542 resolves.

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

Common symptoms and faults

• 01

  The boiler heats normally, but the thermometer always shows the same reading; it neither rises nor falls.

  Cause: The capillary contains a sealed liquid or gas that pushes the needle through pressure; if the mechanism has seized or the capillary has lost its tightness, the needle stops responding even though the water does change temperature.

  Before replacing it, check that the capillary is not crushed or bent at a sharp angle between pipes: a kink can block the reading without the part being faulty.

• 02

  A drop or a ring of moisture appears next to the brass fitting, at the base of the sensor.

  Cause: The brass fitting is the only connection point with the water circuit; over the years, the gasket or the thread gives way and starts to leak.

  Tighten the fitting with an appropriate wrench, without forcing it, and dry the area well: if the moisture reappears within a few hours, the leak is from the part and not from a simple loose tightening.

• 03

  The capillary is visibly bent, twisted, or has a flattened section.

  Cause: It is a very thin tube with little protection; it can be easily damaged when handling the boiler or when other elements are passed nearby.

  Follow the complete path of the capillary visually: if the bend has not caused it to break or leak, sometimes it is enough to carefully redirect it instead of replacing the part.

• 04

  The needle moves, but the temperature it indicates does not match what is felt on the pipe.

  Cause: The sensor tip of the capillary may have shifted from its original contact point, or the mechanism has lost accuracy with use.

  Check that the end of the capillary is still properly positioned at its measurement point and has not come loose before declaring the part defective.

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.

Vaillant 101542 pressure gauge datasheet

Catalogue reference

101542

Brand

Vaillant

Type of part

Pressure gauges - Aquastats

Units in stock

5 units

Status

Refurbished

Warranty

1 year

Shipping

1-2 business days

Return

14 days

Data read on the part and in the manufacturer's documentation

What we have not been able to verify does not appear here.

connection

brass fitting