Termet MiniMax Dynamic Turbo Overheating & Error Code L3: Discussing Causes & Possible Solutions

Hello
I have a Termet MiniMax Dynamic Turbo oven in my apartment, which is already 8 or 9. I noticed in it a strange problem, namely that when I set a temperature other than 70 degrees to CO, the oven is constantly overheating and the L3 code pops up (the exchanger cooling is known). After setting the temperature to 70 degrees, the stove heats normally, i.e. the temperature reaches the specified temperature and is kept, and the L3 code does not appear at all. From the information I have, I know that the oven was cleaned every year.
A specialist wants to call the stove because I do not know it completely, but we know how it is today and I would like to know in advance what might be wrong so that the service technician would not exchange half of the stove for me. Of course, if someone met with such a failure.
Greetings Tomek

L3 is not a malfunction. Reading the user manual should help.

kz61 wrote:

L3 is not a malfunction. Reading the user manual should help.

Yes, I know, but the oven still exceeds the set temperature and enters a cooling state. Only when I set 70 degrees it is kept and oscillates within 68-71 degrees, until the controller on the wall sends a signal that it has heated the room to the appropriate temperature.

If the temperature outside the window rises to 70 degrees it will also enter L3. The minimum power of such a boiler is relatively high for plus temperatures and at some point it must move L3 to maintain the set parameters. The weakest 21 KW has a minimum of 6 KW. The next 24 KW has a minimum of 7 KW. Even condensates that go down to 3 KW treat in such conditions. It is important that the radiator in the room where the room regulator hangs is open to full, no thermostatic heads. The room is to be warmed up quickly and the controller will turn off the boiler. In principle, the timing phenomenon should be troublesome where there is no room regulator.

The problem is that the stove has been doing this since December last year. Whether there is a plus 5 or minus 20 outside, there is no difference in the operation of the furnace.
I read a lot about forums about filter cleaning, outlet pipe about three-way valve replacements, etc. It follows that such furnace operation can, unfortunately, be everything, but the most important thing is that it needs to be repaired.
I recorded two films how he behaves, on one film it is set at 55 degrees and immediately exceeds the appropriate temperature (the work lasts exactly a few seconds and so on and on) and on the other I set 70 degrees and behaves ok.
The only thing I've noticed is the flashing LED on the left, which signals the operation of the central heating boiler, the display with the temperature goes crazy (the numbers jump) and the flame goes on max (a second or two).

[Film: bbf851bd6a] https://filmy.elektroda.pl/92_1487972135.mp4 [/ film: bbf851bd6a]
[Film: bbf851bd6a] https://filmy.elektroda.pl/0_1487972168.mp4 [/ film: bbf851bd6a]

I apologize in advance for the logo of the program to change the format of the film, but it was brewed too much.
greetings

It is necessary to clean the CO filter under the boiler. Too rapid temperature rise, heat is not properly dissipated. I assume the pump is working. The first few seconds are the start sequence without modulation. At 55, he catches him at start and has to turn off the burner. At 70 has more time and enters modulation. That's how I would explain it.

Hello
Thank you in advance for your interest.

I removed the two filters and they were clean. It seems to me that these are filters from the circulation of water and hot water to the tap.


With this modulation it is so that sometimes it catches and the flame changes (rarely this happens).
When the stove catches it it works a few minutes, but from time to time strange numbers appear on the display and the CO LED diode starts blinking. Tonight, I noticed that when the stove does not work, the display also shows changing numbers. I wonder if this is not the fault of the dial on the temperature of the central heating or electronics.

Greetings.

There could be a potentiometer on the board, it happened. When you touch the dial, the display then goes silly. The second option is the temperature sensor, but the damage would have to be mean because the disc is detected by error 04.
This zinc mixed with brass under the boiler is a failure. Aluminum radiators are still missing. In these elbows there may be clearances for a match but we will not verify it without dismantling.

I know that this installation is one big failure. A friend gave me a drip valve and it ended in a hole in the wall.


I will call for service after the winter and I will hope that someone honest will come.

Maybe someone is from the vicinity of Bytom and knows about things?