ᐅ Temperature differences in hot water tanks between the thermometer and the tank sensor

Hello,
I have a problem:
Our entire heating system is powered by district heating. Hot water is heated in the boiler.
The boiler has a thermometer and a sensor that connects to the district heating transfer station, indicating the temperature the water SHOULD be.

Now I have realized that the sensor temperature is incorrect, often by as much as 12 degrees.
The boiler thermometer still shows around 50°C (122°F), but the district heating station only shows about 37°C (99°F) — WITHOUT significant water usage.

I also tested by drawing hot water from the kitchen, removed the boiler sensor from the boiler, and held it in the hot water. There, the sensor showed the correct temperature of around 50°C (122°F).

--> The sensor is not broken; the sensor is simply transmitting incorrect values.

The boiler is from the brand Di-Tech.

What can be done?
Many thanks!

PS: The boiler sensor is attached inside the boiler with a kind of spring clip that you pinch together, and the sensor is positioned inside, so the sensor installation should be correct!...

Hello, you write that the heating is connected to district heating, so about 37°C (floor heating) should be fine. If the domestic hot water is heated in the boiler, that has nothing to do with the district heating pipe, right?

Exactly, underfloor heating is no issue at all!

But I definitely want the hot water at 55°C (131°F). And I don’t want the 500-liter (132-gallon) boiler to heat up from 37°C (99°F) back to 55°C (131°F) every two hours just because the sensor is clearly providing incorrect readings to the district heating station.

As I said, the water is still above 50°C (122°F) when I let it run in the kitchen, but the boiler sensor only shows 37°C (99°F), and the district heating station wants to heat the boiler again.

So if I understand correctly, the district heating station controls the heating process of your separately managed boiler. In that case, the operator of the district heating station is responsible for monitoring this. Additionally, the water should be heated to around 60°C (140°F) once a week to prevent Legionella.
Best regards

Well, the heat exchanger station only heats up because the sensor is giving wrong readings.

Could there be a problem with the connection where the sensor plugs into the boiler? On the other hand, I can’t insert the sensor into the boiler any further than fully seated.

Hello,
I’m not sure if the sensor is the issue. Was the boiler also supplied by the same provider? If yes, they need to check it. If not, you should order a <specialist.
Best regards