Support for issues with Solarbayer HVS, BioX, or PLT biomass boilers
Receive comprehensive support in case of faults or problems with your Solarbayer HVS wood log boiler, BioX wood log boiler, or PLT pellet boiler
Please select your boiler model.
If you do not know your boiler model, check the type plate or your last measurement certificate, which you received from your local chimney inspector.
Is an error message displayed on the control panel?
If yes, please refer to the manual for more information about this error message and follow the solutions listed there.
You can find the latest versions of the instruction manuals under the following links.
Has an exhaust gas test already been carried out by a chimney sweep?
The measurement certificate from the exhaust emission test can be used to perform an informative error analysis with suggested solutions. Click here to go directly to the input screen for the data from the measurement certificate:
Continue to enter the data from the measurement certificate
HVS Issues
Boiler "does not burn properly"
- Check boiler settings and adjust according to factory specifications
- Forced draft fan must run at constant power. Fan power must not drop below 80%.
- Boiler must be cleaned according to maintenance schedule
- Check nozzle stone for wear
- For HVS-E secondary air supply, set to factory setting (2.5 turns) and adjust during flue gas measurement. (O2 target value = 5-7%)
- Check chimney draft (10-15Pa)
- We recommend using the chimney draft limiter ZUK180 (Item No.: 530042000)
- Check firewood quality
(Moisture 15-18%; log length must correspond to the loading chamber length; 8-10cm edge length)
Boiler heavily fouls
- Check return temperature into the boiler, it can be read at the mixing valve of the return lift (target value: 65 – 70°C)
- Check firewood quality
(Moisture 15-18%; log length must correspond to the loading chamber length; 8-10cm edge length) - Check nozzle stone for wear
- Check loading chamber floor for damage, the secondary air pipes left and right next to the nozzle stone must NOT BE VISIBLE!
- Check flue gas heat exchanger and flue pipe for contamination
- If flue gas temperature is too low (<180°C), some flue gas turbulators can possibly be removed from the boiler
- For HVS-E secondary air supply, set to factory setting (2.5 turns) and adjust during flue gas measurement. (O2 target value = 5-7%)
Hollow burn in loading chamber
- Check chimney draft (10-15Pa)
- We recommend using the chimney draft limiter ZUK180 (Item No.: 530042000)
- Check firewood quality
Check (Moisture 15-18%; log length must correspond to the loading chamber length; 8-10cm edge length) - Reduce fan power (Menu 2.1.1;
= -2)
- Check chimney draft (10-15Pa)
Boiler struggles (does not draft properly)
- Increase fan power (Menu 2.1.1; = -2)
- Check firewood quality
(Moisture 15-18%; log length must correspond to the loading chamber length; 8-10cm edge length) - Check chimney draft (10-15Pa)
- We recommend using the chimney draft limiter ZUK180 (Item No.: 530042000)
- Possibly use an external smoke extractor in the chimney system
- For HVS-E secondary air supply, set to factory setting (2.5 turns) and adjust during flue gas measurement. (O2 target value = 5-7%)
- Increase fan power (Menu 2.1.1;
Boiler hums and rumbles
- Check chimney draft (10-15Pa)
- We recommend using the chimney draft limiter ZUK180 (Item No.: 530042000)
- Reduce fan power (Menu 2.1.1; = -2)
- Check firewood quality
Check (Moisture 15-18%; log length must correspond to the loading chamber length; 8-10cm edge length) - Check nozzle stone for wear
- Check loading chamber floor for damage
- Check ignition flap for tightness
- For HVS-E secondary air supply, set to factory setting (2.5 turns) and adjust during flue gas measurement. (O2 target value = 5-7%)
- Check chimney draft (10-15Pa)
Boiler smokes heavily
- Check nozzle stone for wear
- Check loading chamber floor for wear
- Check chimney draft (10-15Pa)
- We recommend using the chimney draft limiter ZUK180 (Item No.: 530042000)
- Possibly use an external smoke extractor in the chimney system
- Check seals as described in the manual and replace if necessary
- Check ignition flap for tightness
- Especially in summer and transitional periods, unfavorable pressure conditions can occur in the chimney. In this case, the generated flue gas cannot be transported through the chimney. When lighting up, possibly leave the ignition flap open a little longer to get the chimney up to temperature faster and thus improve the chimney effect.
BioX Issues
Boiler "does not burn properly"
- Check primary air openings in the loading chamber for contamination
- Check loading chamber floor for wear
- Boiler must be cleaned according to maintenance schedule
- Check chimney draft (10-15Pa)
- We recommend using the chimney draft limiter ZUK180 (Item No.: 530042000)
- Check firewood quality
(Moisture 15-18%; log length must correspond to the loading chamber length; 8-10cm edge length) - Check boiler settings and adjust according to factory specifications (Boiler max temperature P.02 = 90°C; Boiler temperature target value P.03 = 83°C)
Wood boiler heavily fouls
- Check firewood quality
Check (Moisture 15-18%; log length = 50cm; 8-10cm edge length) - Check loading chamber floor for damage
- Check flue gas heat exchanger and flue pipe for contamination
- Check return temperature (target value: 65 – 70°C)
- Check chimney draft (10-15Pa)
- We recommend using the chimney draft limiter ZUK180 (Item No.: 530042000)
- Check boiler settings and adjust according to factory specifications (Boiler max temperature P.02 = 90°C; Boiler temperature target value P.03 = 83°C)
- Check firewood quality
Hollow burn in loading chamber
- Check chimney draft (10-15Pa)
- We recommend using the chimney draft limiter ZUK180 (Item No.: 530042000)
- Check firewood quality
Check (Moisture 15-18%; log length = 50cm; 8-10cm edge length) - Possibly install air regulation set
- Check chimney draft (10-15Pa)
Boiler struggles (does not draft properly)
- Check firewood quality
Check (Moisture 15-18%; log length = 50cm; 8-10cm edge length) - Check primary air openings in the loading chamber for contamination
- Check seals of smoke outlets for wear
- Check flue gas heat exchanger and flue pipe for contamination
- Check chimney draft (10-15Pa)
- We recommend using the chimney draft limiter ZUK180 (Item No.: 530042000)
- Possibly use an external smoke extractor in the chimney system
- Check firewood quality
Boiler hums and rumbles
- Check chimney draft (10-15Pa)
- We recommend using the chimney draft limiter ZUK180 (Item No.: 530042000)
- Install air regulation set (Item No.: 390707700)
- Check firewood quality
(Moisture 15-18%; log length = 50cm; 8-10cm edge length) - Check loading chamber floor for damage
- Check chimney draft (10-15Pa)
Boiler smokes heavily
- Check loading chamber floor for wear
- Check chimney draft (10-15Pa)
- We recommend using the chimney draft limiter ZUK180 (Item No.: 530042000)
- Possibly use an external smoke extractor in the chimney system
- Check seals as described in the manual and replace if necessary
- Especially in summer and transitional periods, unfavorable pressure conditions can occur in the chimney. In this case, the generated flue gas cannot be transported through the chimney. When lighting up, possibly leave the ignition door open longer to get the chimney up to temperature faster and thus improve the chimney effect.
PLT-AC / Compact Issues
Pellet boiler heavily fouls
- Check return temperature (target value: 55 – 60°C)
- Check burner pot for contamination
- Check flue gas heat exchanger and flue pipe for contamination
- Check pellet calibration
- Perform underpressure test using value [SPA] during "Output function test"
- Check chimney draft (10-15Pa)
- We recommend using the chimney draft limiter ZUK180
- Check pellet quality (residual moisture approx. 5 - 8%; low dust content; little pellet breakage)
- Check boiler settings and parameters (consult support if necessary)
Boiler struggles (does not draft properly)
- Check burner pot for contamination
- Check flue gas heat exchanger and flue pipe for contamination
- Check pellet calibration
- Perform underpressure test using value [SPA] during "Output function test"
- Check chimney draft (10-15Pa)
- We recommend using the chimney draft limiter ZUK180 (Item No.: 530042000)
- Possibly use an external smoke extractor in the chimney system
- Check pellet quality (residual moisture approx. 5 - 8%; low dust content; little pellet breakage)
- Check boiler settings and parameters (consult support if necessary)
Boiler hums and rumbles
- Check chimney draft (10-15Pa)
- We recommend using the chimney draft limiter ZUK180 (Item No.: 530042000)
- Check burner pot for contamination
- Check pellet calibration
- Perform underpressure test using value [SPA] during "Output function test"
- Adjust power range (P.02 and P.03), fuel quantity (P.06) and air quantity (C.65) to ambient conditions (reduce)
- Check pellet quality (residual moisture approx. 5 - 8%; low dust content; little pellet breakage)
- Check boiler settings and parameters (consult support if necessary)
Unburned pellets in ash container
- Check pellet feed chute in boiler for wear
- Check burner pot for contamination
- Check cleaning cycle setting (P.26)
- Check boiler settings and parameters (consult support if necessary)
- Check ignition element using value [rES] during "Output function test"
Burner pot fills with pellets
- Check ignition element using value [rES] during "Output function test"
- If the burner is removed from the boiler and reinserted, the boiler shows a blinking flame symbol in the off state because it has detected the brightness in the room (top left on the screen). Please wait to turn on the boiler until this symbol is no longer displayed.
- Disconnect the boiler from the power supply for 1 minute and then restart it
Boiler smokes heavily
- Check burner pot for wear
- Reduce pellet start quantity (P.05) so that the time between pellet start quantity feed and pellet ignition is max. 2.5 minutes.
- Check chimney draft (10-15Pa)
- We recommend using the chimney draft limiter ZUK180 (Item No.: 530042000)
- Possibly use an external smoke extractor in the chimney system
- Check seals as described in the manual and replace if necessary
- Especially in summer and transitional periods, unfavorable pressure conditions can occur in the chimney. In this case, the generated flue gas cannot be transported through the chimney. We recommend using an external smoke extractor in the chimney system.
Registration/connection problems with the PLT app
- The Wi-Fi network must be a 2.4 GHz network
- If a 5 GHz network is also broadcast, it must be broadcast under a different name
- Ensure better Wi-Fi connection in the boiler room (full reception is required)
- Use e.g. a Wi-Fi repeater or a powerline adapter (Wi-Fi over power socket)
- Open the top cover and the boiler door to enable better Wi-Fi connection to the boiler
- Disconnect the boiler completely from the power supply for about 30 seconds and try again
- Reset the Wi-Fi board
- Press button S1 on the back of the Wi-Fi board (PLT Connect card)
- Unlock the Wi-Fi board
- After several unsuccessful connection attempts, the board locks itself for security reasons
- Follow the instructions as described in the manual [Instruction PDF: "Unlocking the Wi-Fi board"]
- Place the Wi-Fi board outside the boiler in a plastic housing
- Bus connection (J4) + power connection required (C1)
- The Wi-Fi network must be a 2.4 GHz network
Thank you for using our online service to identify problems and find solutions. We are pleased that you were able to find the cause and that we were able to help you.
