9
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Faults and malfunctions
63
FA ROTEX A1 BO - 10/2007
Unlocking the automatic firing unit:
Requirements: The cause of the malfunction is rectified, the burner is electrically connected.
• Turn on A1 BO.
•
Reset by briefly pressing the Manual button on the boiler control (fig 5-1, pos. 13).
•
Reset by briefly pressing the Reset button on the boiler control (fig 5-2, pos. 29).
9.5
Rectifying STL fault
When the STL indicator (fig 5-1, pos. 3 and fig 5-2, pos. 3) lights up, it indicates the boiler overheating. The safety temperature
limiter (STL) shuts off the system and locks it.
• Before unlocking the STL, determine the cause for the boiler overheating and rectify it (see tab. 9-3).
Unlocking the STL
• Remove sound insulation hood (see fig 2-1, pos. 1).
• Unscrew STL cover (fig 5-1, pos. 17 and fig 5-2, pos. 17).
• Unlock STL switch with pointed object.
• Screw on STL switch.
• Install sound insulation hood.
9.6
Emergency operation
In manual operation, the 3-way diverter valve is in the "Storage tank charging" position first. On reaching the maximum adjustable
storage tank temperature, the 3-way diverter valve is switched to the "Heating" position.
If the 3-way diverter valve is faulty, the motor head of the valve drive can be removed (see section 7.1.2). The diverter valve is
on the Heating setting.
Manual parallel operation of the heating circuit and hot water storage tank can be set
temporarily
(see section 7.1.2).
In the event of a malfunction or incorrect settings of the electronic control, emergency heating operation can be maintained.
• Press Manual button (fig 5-1, pos. 13) for approx. 5 s.
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The indication "Manual operation" appears on the display.
• Adjust the desired temperature with the rotary switch (setting range 5–80 °C).
The cause of the last fault is saved in the unit and can be reconstructed on restarting the unit, even after power
failure.
Further information about operating processes and malfunctions can be obtained from the automatic units by
using a reading unit (accessory).
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WARNING!
Risk of burns due to hot boiler body.
• Do not touch any metallic parts on the boiler.
• Let the boiler cool down.
• Wear protective gloves.
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