Defro Komfort EKO 15KW failure "Mosfet temperature too high"

I have five defro duo uni 25 kw and after 10 years I got a message that the mofset temperature was too high and thanks to your advice I managed to control the situation, I bought a 1uf and 2uf capacitor and a mofset transistor. First, I replaced the transistor in the 1uf controller, the old one had half the capacity, but it did not help, then I replaced the 2uf fan capacitor, the old one had 1.47uf and it did not help, only replacing the mofset transistor helped and so far silence for a few hours everything is ok thanks to all for, advice

Gentlemen, I'm green with electronics. Please advise:
In the oven I have a transistor as in the picture on the board, but I bought one as it lies on the countertop.
Are these other markings important? They should be the same or I can safely mount this new transistor

The markings on the first line are important. As far as I can see, these transistors are the same.

I also had the message "mosfet temperature too high" after replacing the capacitors and the transistor, the message "mosfet sensor damaged" Anyone?

Replacing the mosfet with another one will help.

djluki2013 wrote:

Replacing the mosfet with another one will help.

So the one I installed may be faulty?



Added after 8 [minutes]:

I replaced the blue capacitor and transistor marked "1" and the capacitor at the blower
Before, I was getting the error MOSFET TEMPERATURE TOO HIGH, after these exchanges, a DAMAGED MOSFET pops up
Let me just mention that transistor 1 did not overheat and now it does not heat up, while the warm ones (hot) are those with the markings 2 and 3, but it seems to me that 2 is more

I did a few of these drivers, the habit of replacing the 1qF capacitor helped. Once I replaced the transistor and capacitor in the blower. These new transistors are produced as soon as possible, sometimes with 10 pcs, one is damaged at the start. Once I had 10 IGBTs, before assembly I checked and 4 were shorted. The changers were with the word Toshiba. The wholesaler guaranteed that the originals are but they were not, Sent me good.

Happy new year. For present I have "Mosfet too hot" error. Burner is DEFRO agro uni with K1Pv2 Feeder and fan works freely, no obstructions. I opened the cover and measured the temperatures by hand - the hottest thing was the green transformer. Mosfets were fine I suppose. What will be the reason for the transformer to run hot? The part is TEZ 6,0/D art 16009-9991 https://www.tme.eu/en/details/tez6_d_9v/pcb-transformers/breve-tufvassons/tez6-d230-9v/

I ordered some blue condensators and waiting for them...

Also will be very thankful if anyone posts a link to schematic for wiring the K1Pv2 I have one wire unconnected:

I replaced the transistor and the 1 uF 400 V capacitor today, there is no error so far and I am optimistic.
But I have a question, where exactly is the second blower capacitor 2 uF 400 V. I ordered it just in case, I haven't replaced it yet. But I don't even know where it should be. I don't see any on the blower. Regards

In this black housing by the blower where the power cable goes.

72 hours without problems, after blue capacitor change. Thanks to the forum!

Does anyone know how the fan is controlled? How exactly is the control resolved? Is it phase control or something else?

The capacitor rarely fails because it is made with ceramic technology. To start with, I would suggest everyone to clean the airflow duct, clean the fan and check the fan bearings. If the air blow channel is clogged or the bearings have a lot of resistance when turning the fan, you will also get the error message. "Mosfet temperature too high".

After about 6 years of service, my K1PV4 controller has just died.
The controller shows a MOSFET temperature error after a few(nast) minutes of fan operation. The MOSFET heats up to just under 90 degrees, when I open the case the error doesn't appear so quickly.

Tech company takes water in the mouth when I ask for technical details, they say that the controller to be repaired for 500zł and a week to wait.
Fan rather not seized, ducts after pre-season cleaning, don't know how the fan capacitor is (haven't checked yet). The fan works normally until the alarm occurs.
The fan draws a max of 0.7A, but this is only for a fraction of a second when suddenly increasing the speed, normally it does not draw more than 0.4A. The controller states a max of 0.6A for the fan, so it is rather within the norm.

The capacitor with a nominal value of 1uF is now actually 211nF (1/5 of the capacity). There is even a sticker on the controller housing that says "1uF" in large font.
It seems that at Tech the problem is known, since they gave a 1uF sticker (probably so that their technician would know which one to put in, assuming that the controller will go to service after a few years to replace the capacitor).

intellectusartificia wrote:

The capacitor rarely fails because it is made with ceramic technology.

The capacitor is connected by a path to the AC side of the rectifier bridge, meaning it will lose capacitance over time like other capacitors operating on AC. It is a polypropylene capacitor.

I will let you know what happens after replacing the capacitor.

EDIT: Capacitor replaced, MOSFET stayed original, everything works fine, managed to save 5 hundred.

For me, the problem looked similar. In the last stage, the alarm was already popping up every 30 seconds. I could not leave the boiler room. I took the controller apart, threw the fan over the board and so survived for a while. In the meantime I ordered a blue capacitor, replaced it and the furnace is running as before. I should add that the capacitor with a nominal value of 1 µF was actually 110 nF. The service called me for £500 and a week without a controller in the middle of winter. I ended up spending £25 for the capacitor and MOSFET (because I took a spare) and £25 labour.

Hello everyone and please help.
I have a Defro duo 15kw cooker, the controller for it is kp1v2. I got a message on the controller display "temperature not rising" the feeder ejected Coal as if the fan was not working. I turned the cooker off and on after about 3 hours. The cooker started up but the fan ran for about 5 seconds and then stopped, I could not turn it on in manual mode. I did this several times and always the same thing.
I connected the fan briefly without switching on the cooker and it runs continuously. I connected it to the cooker and it ran until the speed was reduced on the controller, after which it was the same. It comes on for about 5s and that's it. I checked the capacitor, its capacity is 1micro and it should be 2micro. I replaced it. The same thing still happens, I should add that a month ago I also got the message - Mofset temperature too high, but then I turned the cooker off and on and the problem disappeared.

Added after 1 [hour] 26 [minutes]: .

I have read on the forum , that replacing the capacitors may help, please suggest which ones.