6 x Faults and failures
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BA ROTEX A1 BG Inline - 10/2007
6 Faults and Failures
6.1 Fault detection and troubleshooting
The electronic system in the gas condensing boiler detects faults and displays them:
– through a fault code in the display, for faults detected by the boiler control ROTEX THETA 23R.
– through the collective fault signals in the boiler control panel and through a fault code on the display, for faults detected by
the CVBC automatic firing unit, which leads to an interlocking failure.
Unlocking in the event of fault shutdown
The CVBC automatic gas firing unit starts and monitors the firing program process. This is followed by a fault shutdown:
– if the starting speed of the burner fan is not achieved,
– if a flame signal is present during pre-ventilation,
– if no flame starts on Start (5 possible start attempts) after 5 seconds each (safety period),
– in the event of flame failing five times within 4 minutes,
– if the inflow temperature is too high (STB function),
– if the sensor equalisation procedure for the electronic STB function is defective.
The fault shutdown of the burner is displayed by "E" and a two-digit fault code on the display of the boiler control panel. You can
unlock the burner (maximum 5 times in an hour) by briefly pressing the Manual key on the boiler switchboard (Fig 4-1, item 13).
If the system shuts off on failure several times, the heat system must be checked (e.g. flue gas system, fuel supply). Please
contact a specialised heating agency.
Troubleshooting
• Determine and rectify the cause for the failure (refer to chapters 6.3 and 6.4). If you are unable to determine the cause of
failure yourself, please consult a specialised heating agency.
• Interlocking fault: Lift the interlocking by briefly pressing the manual button on the boiler control panel (max. 5 times
per hour).
• Non-interlocking failures are indicated as long as failure conditions are present. If the cause has been eliminated, the unit
continues to work normally.
6.2 Emergency operation
If the electronic control malfunctions or has wrong settings, you can maintain an emergency heating operation (also refer to
section 4.2.1).
• Press the manual button on the control for about 5 sec.
Î The indication "Manual operation" appears on the display.
• Adjust the desired temperature with the rotary switch (setting range 5 - 80 °C).
In manual operation, the 3-way switch valve is in the "Storage tank charging" position first. On reaching the maximum adjustable
storage tank temperature, the 3-way switch valve is switched to the "Heating" position.
If the 3-way-switch valve is defective, you can take off the motor head of the valve drive. The switch valve is then in the
"Heating" position.
A manual parallel operation of the heating circuit and hot water storage tank can be set up provisionally.
WARNING!
An improperly executed fault detection and troubleshooting can endanger human life and health and have an
adverse effect on the functioning of the gas condensing boiler.
• Activities, especially on gas and flue-gas conducting components as well as on the electrical system, must
be carried out only by heating experts authorised and trained by the gas or energy supply company.
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