Grundfos Scala2 problems

This post is about Grundfos Scala2 problems https://product-selection.grundfos.com/es/products/scala/scala2?tab=models

Grundfos Scala2 problems: error1

The customer called us because he had a problem with a Scala2: in the display he saw the error1 appear and a red lightening was blinking, therefore he looked for informations.

He discovered that the the error1 is related to an electrical fault, so he recommended to his tenant to plug the pump to a different socket.

The tenant did it, however, she couldn’t solve the problem. Consequently, he sent me this video: https://youtube.com/shorts/w7Wk6tGUzfo and asked me to go there and to do what was needed.

On-site visit

I like to go on the place more than tell to the customers to bring me the pumps at my workshop, because often the problem started with a bad installation. Moreover I was glad to be paid to make an on-site visit.

When I arrived at the place, I immediately noticed that the first installation had been very bad executed. In fact, to put a little, twisted, flexible cable in the suction line always brings a lot of problems to the pump.

I checked on the shaft rotation. Ok.

I checked on the electricity. Ok. Therefore I told to the customer that I had to dismount the pump to understand if there was any problem with the hydraulic part.

Finally, I replaced the old pump with a similar one in order to leave the tenant with a good pressure in the house:

https://youtube.com/shorts/M_2nq85XpYo

Analysis of the problem in the workshop

In the workshop I could disassemble the pump and check on the two inner no return valve.

Secondly I checked on impellers, diffusers and on the sensor: I noticed some imperfections but it didn’t look like they could affect on the general status of the pump and generate the Error1…

https://youtube.com/shorts/f58mJek-XZg?feature=share

Water test of the Scala2 and final considerations

Once the pump was reassembled, I carried out a water test.

The pump started working immediately, yet I noticed it didn’t stop when all the taps were closed. I also noticed that the maximum pressure has been selected, so I tried with a lower pressure.

With a lower pressure, the Scala2 integrated inverter, could stop the pump correctly.

As a result, the problem was that the bad installation with the little, twisted, flexible pipe probably damaged the hydraulic part and now the scala2 can’t reach the higher pressure.

https://youtube.com/shorts/e-H9loi-SzU?feature=share

So, eventually we can state two important things:

– Firstly, the Scala2 Error1 is not exactly directly related to the power supply eheh

– Secondly, you have to be very careful with the suction line of your pump if you want to avoid cavitation and all the problems related with this phenomenon.