Defaut flame on okofen

[dirk pitt]

the title speaks for itself, I have a flame fault which appears fairly regularly on the PLC display.
of course I am not always there when it appears but at least 1 or 2 times, I could note that it did not appear during the start-up phase contrary to what I thought.
indeed, it is during the start-up phase that this fault is most critical. I know that the automaton checks that the fumes reach a certain minimum temperature in a certain time after starting to consider that the ignition has taken place.

in my case, it seems that the fault appears "spontaneously" during a normal heating phase.
has anyone ever had that ??
and does anyone know what is the parameter and the value which makes trigger this fault. I'm pretty sure it's the smoke temperature because the machine has no other info that reflects the presence or no flame in the fireplace.
there may be a minimum smoke temperature value ??? mine go down quite low since I often operate with a mini modulation in this half-season not very cold.

[manet42]

Here is what I can read on the assembly instructions left by the heating engineer:
"Flame def": Flame control failure, during combustion the minimum T ° provided for the fumes is not reached.
Causes and solutions
1-Lack of pellets; load them.
2- Sensor does not work correctly: check it and its connection.
3-Wrong sensor value: clean it and the smoke pipe.
4-Power too low: Increase the power of the boiler.
5-Sensor moved: Replace the sensor.

So it seems to be point 4. My knowledge goes no further. I do not see 'in the list, of parameter for this minimum T °.

JC

[Did67]

As you are an "old okofenist", confirm all the same: you do not have a temperature probe in the middle of a tube welded in the middle of the "cover" above the fireplace ???

This thermal probe was offered as an option, then it became generalized?

The modulation control takes this into account.

I have this on mine (condensing model).

[dirk pitt]

actually I don't have a hearth probe, just the smoke outlet probe.
what is weird is that I said to myself the same thing as you: smoke temp too low = default.
so to find out at what time the pairing fault, I removed the probe from the flue during operation.
the value has decreased, decreased, without causing the fault

[Did67]

And if you unplug it: default?

This would be an indication of a malfunction of the probe rather than too low temperatures during operation.

Does your experience seem to indicate that it would only be used during the start-up phase? (to make sure the fire has started). To check, output probe.

[dirk pitt]

I will continue the investigations.
shot all weekend without error and last night: bing: error.
I do not understand.

[Did67]

The "erratic" failure: the worst thing to diagnose

[it reminds me of my 1st 2CV, the one with the speedometer on the top left and the "hand" wiper - old people will understand! ; which, from time to time, stopped and then ... started again ... I will summarize: in fact, between the tank and the carburetor, there were tubes and hoses ... In this system, a gravel - how did he get there? ... He was getting sucked against the narrowing ... the car stops ... the suction stopping, the gasoline went on again and it started again ... it took the perseverance to reverse engineer everything, first cleaning the filters: nothing; removal of the tank and cleaning: nothing ... Until one day, stubborn as a mule, I dismantle these pipes !!!]

In your case, given its price, I would start by replacing the probe!

[GPAT]

Bonjour à tous
This subject interests me particularly because I have the same problem.
I have no solution at the moment, but my observations and recordings allow me today to say this:
The flame fault mainly occurs in November, when the boiler begins to modulate.
After 2 or 3 hours of operation at very low powers, the smoke temperature drops below 100 ° C. After a few minutes at 99 ° C or 98 ° C, the flame fault appears.
From December, it is colder and the modulation is done at higher powers, and therefore more problem.

Does your fault arise in the same circumstances?

I tried a lot of settings, changed the smoke probe, without success.

If someone has the solution, I am also interested.

Here I will try point 4 given by Manet42:
4-Power too low: Increase the power of the boiler.

I'll keep you informed.
Pat

[GPAT]

Bonjour à tous

I think the problem is solved.
So I passed the boiler from 15 to 16kw (P265).
I haven't had a fault since. To see over time now.
Well, if it can help.

Thanks to dirk pitt for initiating this discussion and to Manet42 for his response.

Pat

[dirk pitt]

yeah, the problem is not resolved, it is bypassed.
increase the power of the boiler so that it modulates less, it's a shame.