KWB Multifire USV 15/25 V User Manual (English)

Questions and Answers:

A
Anthony LarsenAug 12, 2025
What to do if KWB Heating System fuel extractor motor is overloaded?
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  cunninghamheatherAug 12, 2025
  If the motor of the supplemental fuel extractor is overloaded, it could be due to foreign objects in the fuel. Open the overfill protection cover on the worm trough and remove any foreign objects. Alternatively, the wood chips may be too large or too fine. Use standardized wood chips (G30 = max. piece length approximately 30 mm). A failed mains phase could also be the cause, so check the power supply.
R
Ricky SerranoAug 16, 2025
What to do if the fuel extractor module supply is interrupted in KWB Multifire USV 15/25 V Heating System?
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  Frederick MichaelAug 16, 2025
  If the supply to the fuel extractor module is interrupted, first check the CEE plug-in connector to ensure the fuel extractor module is properly plugged in. If the issue persists, it could be due to one or more tripped glass-tube fuses, a connector malfunction in the three-phase current module, or a missing/short-circuited 24-volt supply voltage. In such cases, notify customer service.
M
Mary SantosAug 19, 2025
What to do if the overfill protection switch of the KWB Multifire USV 15/25 V Heating System fuel extractor is overloaded?
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  David SantiagoAug 20, 2025
  If the overfill protection switch of the fuel extractor is overloaded, switch off the main switch and switch it on again to open the fire shutter. Then, open the overfill protection cover and remove all the wood chips in this area. This issue typically arises when the shaft is clogged, preventing the worm from getting stuck.
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Craig BryantAug 23, 2025
How to fix network error on KWB Multifire USV 15/25 V Heating System fuel extractor module?
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  christine96Aug 23, 2025
  A network error on the fuel extractor module indicates a communication problem on the internal bus between the boiler control unit and the fuel extractor module. Check whether the bus cabling is in order and whether power is supplied. If the alarm cannot be eliminated, notify customer service.
C
carrollkaraAug 27, 2025
What to do if KWB Multifire USV 15/25 V supplemental fuel extractor motor is overheated?
- P
  Paul JacksonAug 27, 2025
  If the motor of the supplemental fuel extractor is overheated, it is possible that the thermal motor protection has tripped. Open the overfill protection cover on the worm trough and remove any foreign objects from the worm trough.
X
xwrightAug 31, 2025
How to troubleshoot Power-LED OFF on KWB Multifire USV 15/25 V?
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  Richard BlackAug 31, 2025
  If the Power-LED is OFF, check the line voltage to the module (3P+N+PE) and inspect the glass-tube fuses in the module. If those are fine, the module might be defective and may need replacement.
E
Evan OrtizSep 3, 2025
How to troubleshoot BUS-LED OFF on KWB Multifire USV 15/25 V?
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  Albert GomezSep 4, 2025
  If the BUS-LED is OFF, check the line voltage to the module (also on the boiler), inspect the bus cabling, and verify the station number (position 1). Also, check the hardware settings on the boiler control unit. If none of these steps resolve the issue, the module might be defective and require replacement.
O
ortizannaSep 7, 2025
What causes a defective triac on the KWB Multifire USV 15/25 V fuel extractor module?
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  nicholasbarkerSep 7, 2025
  A defective triac on the fuel extractor module is caused by a defect in the electronics. Notify customer service.