Rotex A1 BO - Faults and Malfunctions; Troubleshooting Guide; Common Boiler Malfunctions and Possible Causes

9 x Faults and malfunctions
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FA ROTEX A1 BO - 10/2007
9 Faults and malfunctions
9.1 Troubleshooting
The electronic system in the oil condensing boiler detects faults and displays them:
– Through a fault code in the display, for faults detected by the boiler control.
– Through the burner malfunction indicator on the boiler control panel and through a fault code on the display, for faults
detected by the DKO automatic firing unit which lead to an interlocking malfunction.
– Through the STL indicator in the boiler control panel for a boiler overheating detected by the safety temperature limiter (STL)
that leads to an interlocking malfunction.
Troubleshooting
• Detecting and remedying the cause of the malfunction.
• Interlocking fault with fault code in the display: Unlock by briefly pressing the Manual button (Reset button ) on the
boiler control panel (see chapter 9.4).
• STL malfunction: By unlocking the STL switch (see chapter 9.5).
• Non-interlocking malfunctions are indicated as long as there is a malfunction. Once the cause has been eliminated, the unit
continues to work normally.
9.2 Overview of possible malfunctions
Tab. 9-1 Possible malfunctions on the A1 BO (Part 1)
1) see documentation "ROTEX control"
You will find detailed information on the control unit and the boiler control panel as well as on the operating
modes and parameter settings in chapter5 "Control unit" and in the documentation "ROTEX Control" as supplied
with the associated Control unit.
q
a
Malfunction Possible cause Possible solution
Heating system not
functioning (main switch
not illuminated, no
display)
No mains voltage
• Switch on boiler main switch
• Turn on main switch of heating room
• Check / switch on fuse house connection
• Check / renew fuse boiler control panel
Heating does not
warm up
Central heating standby switched off (e.g. timer is in
economy phase, outside temperature too high)
• Check operating mode setting
1)
• Check requirement parameter
1)
(e.g. timer programme)
Heating does not
warm up enough
Heating characteristic too low
• Increase parameter value
1)
Hot water does
not warm up
Storage charging standby switched off (e.g. timer is in
economy phase)
• Check operating mode setting
1)
• Check requirement parameter
1)
Hot water does
not warm up enough
Storage tank charging temperature too low
• Increase hot water target temperature
1)
Draw-off rate too high
• Reduce the draw-off rate, limit throughput
Burner output too low
• See malfunction "Maximum burner output too low"
Maximum burner output
too low
Burner setting wrong
Oil nozzle wrong or dirty
• Adjust burner setting (see chapter 6.3)
• Replace oil nozzle (see section 8.2.8)
Air/flue gas resistance too high
• Check pipes for dirt.
• Use pipes with larger cross section for supply air or flue gas if
necessary
Oil filter dirty
• Replace oil filter
Burner does not start Interlocking malfunction
• Establish cause of malfunction and eliminate it
• Unlock by briefly pressing the Manual button
Burner motor not running
despite burner demand
No mains voltage on burner
• Insert the 7-pin plug on the motor until it engages
• Check voltage at the terminals L-N of the 7 pin plug
• Check / renew fuse.