Descaling a La Pavoni Lever Machine vs Gaggia Classic

Descaling a Gaggia Classic vs. La Pavoni Lever Machines

With the Gaggia Classic Pro (GCP), many users noticed improved espresso shots after descaling.

The reason is often related to the solenoid valve: it can get stuck due to scale or debris, which directly affects water flow.

So, after descaling, these blockages are cleared, and flow is restored—hence the noticeable improvement.

However, there’s a downside: after descaling, debris can sometimes move into the solenoid valve channel, causing it to jam.

This is why many GCP users reported new issues immediately after descaling, like bad water flow or even no flow at all.

When it comes to La Pavoni lever machines, the situation is very different.

The timing of descaling is much simpler to determine because the boiler can be visually and directly inspected.

Unlike the Gaggia Classic machines, where you can only assume descaling is needed and the results are also pretty much assumptions, with the La Pavoni lever machines, you can see scale buildup directly on the heating element or on water pipe. If you notice this, it’s time for a gentle descale first. Never hard and never with super concentrated subtances.

A few important notes for La Pavoni descaling:

Never use homemade substances, unless you know exacly what you are doing — those DIY solutions can attack the boiler’s internal plating/coating.
Do not run descaler water through the group head. That will mess arond with the internal gaskets / washers and also remove any existing grease. If you do that, a re grease is mandatory.
After descaling, rinse the boiler thoroughly several times to remove any residual solution.

The expected results are also different from Gaggia.

After descaling a La Pavoni, you should not expect your espresso shots to suddenly improved — unless the machine was heavily scaled before.

The main benefits are, in my opinion:

Improved heating efficiency.
Protection of the pressure stat switch , by preventing overheating or misreading.

One critical point: during descaling, loosened debris often ends up in the pressure stat switch pipe.

If not rinsed thoroughly, this can cause blockages to the pipe, leading to faulty pressure stat operation.

In fact, many service cases I’ve handled were due to a blocked pressure stat pipe after improper descaling or no rinse afterward.

Best practice that you could take into consideration:

Rinse the boiler multiple times after descaling.
To confirm the pipe is clear, you can anytime remove the pressure stat switch and blow through the pipe. Airflow should be smooth and unrestricted. Remember to remove the boiler knob before you do that