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The fan (blower) is still running in the Defro oven with the feeder

aneta07 38805 11
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  • #1 17103722
    aneta07
    Level 7  
    Posts: 5
    Rate: 25
    Hello, I have a Defro Comfort 30 kW oven with a feeder set for the machine, but it has eaten too much (from November to now 8 tons of eco-pea coal) and changed it to manual. It did nothing and I returned to the machine and since then I have been thinking about the fan that is under the feeder. What should I do, all the time it goes even when it reaches the selected temperature, please help, maybe someone had it too? The oven's current temperature of 58 degrees, set 58 degrees and the blower keeps turning, it will not even stop for a few minutes. Help
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  • #2 17103793
    tkaczu1
    Level 17  
    Posts: 162
    Help: 22
    Rate: 92
    The reason probably lies in the controller, reset it to factory settings if there is such an option. The fan control path may also be damaged.
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  • #3 17104039
    aneta07
    Level 7  
    Posts: 5
    Rate: 25
    tkaczu1 wrote:
    Write what model of driver, there are triac short circuits in the driver and then it works constantly
    Tech Driver
  • #4 17104075
    Adam-T
    Level 41  
    Posts: 5113
    Help: 834
    Rate: 1090
    aneta07 wrote:
    Tech Driver

    And you signed up.
    I have, for example, an Opel car and be smart and guess which model of this Opel. ;)
  • #5 17104079
    Anonymous
    Anonymous  
  • #6 17104683
    aneta07
    Level 7  
    Posts: 5
    Rate: 25
    Adam-T wrote:
    aneta07 wrote:
    Tech Driver

    And you signed up.
    I have, for example, an Opel car and be smart and guess which model of this Opel. ;)
    This is the Tech Defro K1Pv4 driver
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  • #7 17104723
    Adam-T
    Level 41  
    Posts: 5113
    Help: 834
    Rate: 1090
    In the instructions they wrote that it is possible to test the blow-in fan - do it. If nothing helps, save your settings and restore the controller to factory settings as a colleague above.
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  • #8 17105936
    aneta07
    Level 7  
    Posts: 5
    Rate: 25
    My husband did a blower test and came out ok. Then he set the oven to factory settings and the blower keeps on talking does not turn off even for a moment. The temperature is set at 60 degrees, the current temperature also 60 degrees and further blows. Help
  • #9 17106403
    tkaczu1
    Level 17  
    Posts: 162
    Help: 22
    Rate: 92
    If the pump reacts correctly to temperatures, it excludes damage to the temperature sensor. Most likely, the fan control path in the controller is damaged. Service controller.
  • #10 17106450
    hajtaler
    Level 21  
    Posts: 346
    Help: 52
    Rate: 78
    The fan works when reaching the set value with high power or maybe minimal? Pierces the set or oscillates all the time around the set? Because if so, everything is okay - the driver working on the machine (PID) strives for continuous operation. Burning 8ton says nothing when you do not specify the heating surface and degree of insulation. The power of the boiler suggests that you heat a cottage which is 500 m or half smaller without insulation and these 8ton are quite normal
  • #11 17106509
    aneta07
    Level 7  
    Posts: 5
    Rate: 25
    Boiler power as I wrote Defro 30 kw heats the surface of 250m2 + boiler 140. At the back of the furnace I have a 55-way mixed valve, 55 degrees, I have no valves on the radiators. The house is insulated. Maybe some other settings are to be done I do not know. During feeding, the blower works faster but then, despite the temperature reached, blows all the time but works slower. Please tell me if the blower is meant for this flap to be open all or some percentage and blocked.
  • #12 21690948
    kubiesmonika
    Level 2  
    Posts: 2
    Rate: 1
    Hello .
    Please help me with my cooker.
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Topic summary

✨ The discussion revolves around a Defro Comfort 30 kW oven experiencing an issue where the blower fan continues to operate even after reaching the set temperature of 58 degrees Celsius. Users suggest potential causes, including a malfunctioning controller or temperature sensor. Recommendations include resetting the controller to factory settings and testing the blower fan. One user notes that the fan operates continuously, even when the actual temperature matches the set temperature, indicating possible controller damage. The conversation also touches on the heating capacity of the oven and its efficiency in relation to the size and insulation of the heated space.
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FAQ

TL;DR: OP burned 8 tons of eco‑pea coal; “the driver working on the machine (PID) strives for continuous operation.” Fix by testing the fan, trying factory reset, then servicing a failed fan control path/triac if needed. [Elektroda, hajtaler, post #17106450]

Why it matters: This FAQ helps Tech/Defro owners diagnose a blower that won’t stop after reaching set temperature.

Quick Facts

Why does my blower keep running after the boiler reaches temperature?

In machine/PID mode, the controller aims for stable heat and may keep the fan spinning slowly near the setpoint. As one expert notes, “the driver working on the machine (PID) strives for continuous operation.” This is expected behavior when the temperature oscillates around the set value. [Elektroda, hajtaler, post #17106450]

How do I test the blow‑in fan and try a safe reset on Tech/Defro?

Use the controller’s built‑in fan test, as described in the manual. If the test passes, save your settings and restore factory defaults to rule out bad parameters. Re‑enter your settings afterwards and observe if behavior changes. [Elektroda, Adam-T, post #17104723]

The fan test passed and a factory reset didn’t help—what next?

Service the controller. “Most likely, the fan control path in the controller is damaged.” A shorted triac or failed output stage can keep the blower energized even at the setpoint. Only repair or replacement resolves a hardware fault. [Elektroda, tkaczu1, post #17106403]

Could a bad temperature sensor cause a constantly running fan?

Unlikely if other circuits (like the pump) react correctly to temperature. That behavior indicates the sensor reads fine. A stuck fan with good readings points back to the controller’s fan control path. [Elektroda, tkaczu1, post #17106403]

What does “triac short” mean for this boiler controller?

It refers to a failed switching component in the driver that can hold the fan output on continuously. Users reported that when the triac shorts in the driver, the fan “works constantly,” requiring service. [Elektroda, aneta07, post #17104039]

My controller hangs near 60 °C and the fan never stops. Is this known?

Yes. A user with a Comfort controller (blue desktop) saw hangs around 60 °C. During those hangs, the fan ran continuously despite exceeding the setpoint. That points to controller behavior rather than the sensor. [Elektroda, 65469, post #17104079]

Is 8 tons of eco‑pea coal in one heating season abnormal?

Context matters. For a 30 kW unit and weaker insulation, a member noted that 8 tons over winter can be quite normal. Boiler oversizing also raises consumption when modulation is limited. [Elektroda, hajtaler, post #17106450]

How much fuel did the original poster actually report using?

They reported about 8 tons of eco‑pea coal from November to mid‑March while troubleshooting the blower behavior. That concrete figure provides a baseline for comparison. [Elektroda, aneta07, post #17103722]

Which controller model is in this thread’s case study?

The system uses a Tech Defro K1Pv4 driver on a Defro Comfort 30 kW boiler. Matching your model is vital before applying settings or diagnostics. [Elektroda, aneta07, post #17104683]

Will a factory reset always stop a stuck fan?

No. In this case, the fan kept running even after restoring defaults. If PID behavior is ruled out, hardware service is the next step. [Elektroda, aneta07, post #17105936]

What heating area was mentioned for the 30 kW boiler in this thread?

About 250 m² was reported. Oversized boilers serving moderate areas tend to cycle or modulate continuously, which can keep fans active in PID mode. [Elektroda, aneta07, post #17106509]

What’s the best way to ask for help so others can diagnose fast?

Always provide the exact controller/boiler model, not just the brand. As one member quipped, saying only “I have an Opel” isn’t enough to diagnose. List setpoints, modes, and what you already tried. [Elektroda, Adam-T, post #17104075]
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