BAXI Duotec Compact + Boiler: Unwanted Heating of Radiators & Nighttime Activation Issues

Hello everyone.
I have been using the BAXI Duotec Compact + boiler for 4 months. It serves me hot and cold water
The problem is that when I heat water, my radiators start to heat up. I have a room thermostat (controller) connected to a boiler that regulates my temperature in the house and when the temperature in the house is adequate, it turns off the heating, and if I want to heat the water, e.g. for bathing, the radiators get hot.
The service technician has been with us several times, says that the boiler is ok, finally replaced the stirrer, it did not help, also replaced the filter, the problem, unfortunately, still occurs. Anyone had a similar problem?
The second thing - for two days the boiler turns itself on at night and the radiators start to heat, I checked the room controller, the temperature is ok, as it is to be set at night and the controller shows that the stove should not heat and the flame on the stove that heats and temperature 30 degrees, all radiators warm. I turned off the boiler for the night. In the morning I turned on the boiler and the controller started working to heat the temperature in the house and the boiler heated the water in radiators to 30 degrees, radiators cold. I called a service technician and said it was either a dirty filter or a wrong filter was installed, i.e. the gas filter was installed in place of the water filter and the boiler was going crazy and the room controller would not work either. I called the plumber, he arrived, he checked the filter was clean and it was a water filter. Once again to the service technician but he will be until Monday.
I don't know what's going on anymore. Are these boilers just emergency and it was a bad purchase and it will go on forever, or maybe I have it all mounted incorrectly and the service technician does not know what's going on?
Please help if anyone had a similar problem.

Only good factory service will work here, the cauldrons are so new that not everything is known about them yet, what kind of controller you have on off or with type and sense or baxi communication, whether you have an external temperature sensor, where the controller is plugged in.

you ask about the controller which is on the boiler?
I don't have an external sensor.
As for the service, there are two servicemen in my area, one comes and tries to do something but I still have problems with the boiler, the other said that he could come see but if it was not the boiler's fault I would pay 700 PLN for diagnostics, I also stayed with one service technician.
You wrote that these are new boilers, it is possible that service technicians do not know it yet and really do not know where the problem is?
Because a few times when there was a service technician, I heard "now it will be good" and unfortunately it is not.

Added after 26 [minutes]:

The boiler just turned on, as it did late in the evening, and heats up to 30-35 degrees. The room thermostat is currently set for the night, standby because the temperature in the house is right and the transmitter connected to the boiler caught a signal because the LED is green. Room thermostat mam wireless SALUS model 091FLRF (TX)

Added after 48 [seconds]:

Maybe that's the problem with this room thermostat?

Change the address of this salus with jumpers (the same combination in the transmitter and receiver) certainly the neighbor next door has the same and also factory settings and you change the common cause

I used to have it with my auraton. We have all our guests in the block because it was included in the package from the developer. There were also miracles before we put various codes.

Staszek8483 wrote:

The problem is that when I heat water, my radiators start to heat up.
[...] when I want to heat the water, e.g. for bathing, the radiators get hot. [...]
The service technician has been with us several times, says that the boiler is ok, finally replaced the stirrer, it did not help, also replaced the filter, the problem, unfortunately, still occurs. Anyone had a similar problem?

So how do you heat dhw, and the boiler heats radiators, and if a service technician comes, is it OK?
Do you have a stratified tank, do you only heat domestic hot water without a tank?
I do not know Baxi boilers but in 2-function boilers there is usually a plate heat exchanger that heats the hot water and the symptom you are writing about usually means a problem with a three-way valve.
In this situation, the maximum capacity of domestic hot water also decreases, so in the absence of a tank and at high flows you would have unheated tap water.

As for automatic boiler activation, as colleagues wrote, this Salus model has an analogue code selection for transmitter and receiver cooperation, so the neighbor transmitter will control each receiver in range with an identically set code. In addition, the relatively large range means that in extreme situations your boiler can be controlled even by someone from the block next to you if the buildings are close together.

Thank you for advice.
I changed the code in the transmitter and receiver, I watch the boiler from Sunday and everything is ok, it does not turn on.
Added after 53 [minutes]:

BUCKS wrote:

So how do you heat dhw, and the boiler heats radiators, and if a service technician comes, is it OK?
Do you have a stratified tank, do you only heat domestic hot water without a tank?
I do not know Baxi boilers but in 2-function boilers there is usually a plate heat exchanger that heats the hot water and the symptom you are writing about usually means a problem with a three-way valve.
In this situation, the maximum capacity of domestic hot water also decreases, so in the absence of a tank and at high flows you would have unheated tap water.

No, when a service technician arrives, there is a problem all the time. It fixes something, changes something and the problem with heating radiators is all the time.
I have a heat pump, the boiler at these temperatures heats my hot water, tank 270 liters.
I will tell the service technician that this may be a problem with the three-way valve.

Staszek8483 wrote:

No, when a service technician arrives, there is a problem all the time. It fixes something, changes something and the problem with heating radiators is all the time.

I'd rather change a service technician if he doesn't know what's going on, unless you pay nothing for these tests and they don't have the effect of exchange, it will go away in the crowd.
But you never know what it is exchanging or for, whether it is a full-fledged product or a defective product, and always if something is working, it's better to have a factory one.

Staszek8483 wrote:

270 liter tank.

If you have a layered tank with such capacity, you may not feel a decrease in boiler efficiency, because with instantaneous heating you would have a noticeable decrease felt on your own skin.

Staszek8483 wrote:

I will tell the service technician that this may be a problem with the three-way valve.

As an amateur I would check this valve first. The construction of a 2-function boiler is relatively simple and there is no space technology there, so accurate diagnosis should be quick. The more I am surprised that the alleged service technician does not know what to do and makes random exchanges that do not bring improvement. For me, it's a hacker, not a service technician.

Hello

Maybe from the beginning. I am not a specialist in the subject, but I have such questions:

How do you solve the storage tank next to the 2-function boiler?

How is the storage heater (legionella) set?

In the manual of the boiler which has one circuit which is to remain open for cooling after heating the domestic hot water (1-F boiler).

Regards

[Quote = "BUCKS"]

Staszek8483 wrote:

No, when a service technician arrives, there is a problem all the time. It fixes something, changes something and the problem with heating radiators is all the time.

I'd rather change a service technician if he doesn't know what's going on, unless you pay nothing for these tests and they don't have the effect of exchange, it will go away in the crowd.
But you never know what it is exchanging or for, whether it is a full-fledged product or a defective product, and always if something is working, it's better to have a factory one.

As I wrote earlier, I have two service technicians in the region, one said on the phone that he can come and check the boiler, but if it turns out good, the diagnosis will be 700 PLN for payment, and how will I know what he checked there ?? The one who comes to me does everything for free under the warranty, the last time he had to change something was waiting for part 2 weeks, I hope he ordered the original part and therefore such waiting time.

Added after 9 [minutes]:

palala wrote:

Hello

Maybe from the beginning. I am not a specialist in the subject, but I have such questions:

How do you solve the storage tank next to the 2-function boiler?

How is the storage heater (legionella) set?

In the manual of the boiler which has one circuit which is to remain open for cooling after heating the domestic hot water (1-F boiler).

Regards

I do not know much about this and I do not understand the question "How do you have the storage tank next to a 2-function boiler?"

As for legionella, it was also a small problem at the beginning because the service technician set us up once a week and the boiler heated the container every evening, I had to disconnect it, I ordered the service technician to completely turn off the legionella and now I set it myself manually and I do it when I want the legionella. As it will be a little warmer and the pump will work, I have the legionella programmed automatically there.

Staszek8483 wrote:

As I wrote earlier, there are two service technicians in my region, one said on the phone that he can come and check the boiler, but if it turns out that it is good, for diagnosis PLN 700 will be paid

As the boiler is under warranty, there is no such thing as PLN 700 for diagnostics. That is, a smart serviceman.
Since the heaters heaters when heating hot water, the boiler is not functional.
In addition, a second service technician replaces parts, but cannot repair the fault.
For me weird, either you have a wacky guy for 700 PLN or some loser who replaces parts for free, although nothing improves it.
Maybe in the end, if this loser replaces the entire boiler in parts for a new one, it will start working properly.
Unless you have a fucked up installation, and the contractor was the one who now exchanges parts for you and looks for what he screwed up.
On the other hand, since you have a 2-function boiler, I am surprised by a 270-liter stratified tank. I would sooner expect 100 liters, because larger volumes fit more to a tank with a coil, etc.
Either you have enormous consumption of hot tap water or you have mixed up something and it is a little different than it appears from your description.

Either way, no one from the forum can solve it.
You got suggestions, you still have to do it with a service technician but all signs indicate that you have a poor service technician and the other one is a smart, so you don't know which is better.

BUCKS wrote:

Staszek8483 wrote:

As I wrote earlier, there are two service technicians in my region, one said on the phone that he can come and check the boiler, but if it turns out that it is good, for diagnosis PLN 700 will be paid

As the boiler is under warranty, there is no such thing as PLN 700 for diagnostics. That is, a smart serviceman.
Since the heaters heaters when heating hot water, the boiler is not functional.
In addition, a second service technician replaces parts, but cannot repair the fault.
For me weird, either you have a wacky guy for 700 PLN or some loser who replaces parts for free, although nothing improves it.
Maybe in the end, if this loser replaces the entire boiler in parts for a new one, it will start working properly.
Unless you have a fucked up installation, and the contractor was the one who now exchanges parts for you and looks for what he screwed up.
On the other hand, since you have a 2-function boiler, I am surprised by a 270-liter stratified tank. I would sooner expect 100 liters, because larger volumes fit more to a tank with a coil, etc.
Either you have enormous consumption of hot tap water or you have mixed up something and it is a little different than it appears from your description.

Either way, no one from the forum can solve it.
You got suggestions, you still have to do it with a service technician but all signs indicate that you have a poor service technician and the other one is a smart, so you don't know which is better.

Tank I have with a coil, heat pump galmet 270 l.
I do not have much hot water consumption
I know that no one from the forum will solve this problem for me, but I thought that maybe someone had such a problem and his service technician repaired it for him, because if I see my service technician and his inept attempts to fix it, I would like to help him and give him a hint.

Staszek8483 wrote:

Tank I have with a coil, heat pump galmet 270 l.

And these are the differences.
As you wrote earlier, I understood that for heating you have a heat pump, and for hot water you use a gas boiler + tank.
On the other hand, if I understood the information found correctly, the BAXI Duotec Compact + boiler is a 2-function, not 1-function boiler.
For this reason, the 2-function boiler does not match the hot water tank with coil, but the layered tank. The coil is used with a single function boiler.
Such remote advice does not make sense, because there are more questions and doubts than meaningful answers.
If a service technician works for you, he knows better what you have there than we do on the forum.
But with a 1-function boiler + a tank with a coil, the problem is the same, because at a given moment the water can be directed to the coil in the tank or to the radiators, and not to both at once, so again we return to the starting point, i.e. to the three-way valve.
Unless you have some cosmic conversion of a 2-function boiler into a 1-function boiler and it can only be embraced by what it did.

BUCKS wrote:

Staszek8483 wrote:

Tank I have with a coil, heat pump galmet 270 l.

And these are the differences.
As you wrote earlier, I understood that for heating you have a heat pump, and for hot water you use a gas boiler + tank.
On the other hand, if I understood the information found correctly, the BAXI Duotec Compact + boiler is a 2-function, not 1-function boiler.
For this reason, the 2-function boiler does not match the hot water tank with coil, but the layered tank. The coil is used with a single function boiler.
Such remote advice does not make sense, because there are more questions and doubts than meaningful answers.
If a service technician works for you, he knows better what you have there than we do on the forum.
But with a 1-function boiler + a tank with a coil, the problem is the same, because at a given moment the water can be directed to the coil in the tank or to the radiators, and not to both at once, so again we return to the starting point, i.e. to the three-way valve.
Unless you have some cosmic conversion of a 2-function boiler into a 1-function boiler and it can only be embraced by what it did.

What do I have the BAXI Duotec Compact boiler for? 2-function boiler,
For hot water, I have a galmet heat pump with a 270 l coil, but this pump works economically up to 7 degrees outside, as it is cooler it does not pay. So the boiler is also used to heat the hot water which is in the container in winter. (that's what the service technicians advised me from the pump and boiler).
As I have set on the boiler the heating itself which is all ok, hot radiators and not heating me hot water
However, when I set it to heat the hot water it heats the water in the tank and the radiators get warm.
I will add that as the boiler will set two functions at once, which is what and hot water it first heats the water in the tank and not the heaters.

Staszek8483 wrote:

What do I have the BAXI Duotec Compact boiler for? 2-function boiler,
For hot water, I have a galmet heat pump with a 270 l coil, but this pump works economically up to 7 degrees outside, as it is cooler it does not pay. So the boiler is also used to heat the hot water which is in the container in winter. (that's what the service technicians advised me from the pump and boiler)

If you have a 2-function boiler, why do you need a domestic hot water heat pump
For me, one excludes the other, because it does not generate any savings but unnecessary costs.
If you have a 2-function boiler, it was enough to use it for domestic hot water, and if you need more hot water, it was enough to buy a 100-liter stratified tank after a shout.
Or you could have bought a 1-function boiler + water heater coil tank.
Having a gas boiler is buying a heat pump separately from a water heater, I consider it a waste of money.
In addition, these circuses, because when the pump fails, you heat the domestic hot water with a 2-function gas boiler.
I do not know about pumps, but for me someone swam and exaggerated in the solutions used. I wonder if you will ever pay back an investment in such a heat pump, or sooner this pump will go to scrap.

A check valve must be installed on the heating circuit. I had a case with baxim that during hot water heating, he also mixed water in the floor circuit, but in the opposite direction, which is why the installation of the check valve helped.

I don't remember exactly why it was happening, whether it was through the bypass or something else.

I know it was a malfunction of this boiler, because it was a twin and in both houses there was the same problem with this boiler.

No less a boiler worth recommending. Simple to build and cheap to operate.


Returning to the topic of what boiler has the topic author installed. I am asking him to read the rating plate. Does it appear there:
Duo-tec Compact + 20, 24 or 28
whether
Duo-tec Compact + 1.24

Hello
I have a question about the installation of a non-return valve in the return. I have a Baxi Duo tec boiler The floor has not been separated into a separate unit. It is on a common collector with radiators with thermostats used. The controller is set at 20 degrees inside there is a temperature of 21 to 22 degrees and I have a sense of what works. I have enabled water heating and CO.
Will turning back (also from radiators) do the trick? 20190106_1...733[1].jpg Download (1 MB)

It also looks like a return from the boiler to the radiators. Water will flow where it's easier. Or maybe some additional pump is installed and the system is not decoupled ...
Diagrams for this furnace contain only solutions with solenoid valves to shut off individual circuits.
I'm not a specialist, but I'm at the stage of choosing a furnace and installation. My attention was drawn to the fact that the circuits are cut off by a solenoid valve. At least with the c-MIX driver