Troubleshooting | 6
B1510622_en | Operating instructions Firewood boiler S4 Turbo
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6.3 Excessive temperature
The high-limit thermostat (STL) switches off the blower fan at a maximum boiler
temperature of 105 °C. The pumps continue to run.
Once the temperature falls below approx. 75°C, the STL can be reset mechanically.
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Unscrew the cap on the STB (high-limit thermostat)
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Unlock the STL by pressing with a screwdriver
6.4 Faults with fault message
If a fault has occurred and has not yet been cleared:
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Status LED indicates the nature of the fault
- Orange flashing: Warning
- Red flashing: Error or alarm
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A fault message is shown on the display
The term "fault" is a collective term for warnings, errors and alarms. The boiler reacts
differently to the three types of message:
WARNING
In case of warnings the boiler initially continues controlled
operation, giving the option of resolving the error quickly to
prevent a shutdown.
ERROR
The boiler follows the shutdown procedure and remains in "Off"
status until the problem is resolved.
ALARM
An alarm triggers a system emergency stop. The boiler shuts
down immediately, the heating circuit controller and pumps
remain active.