10 Faults and malfunctions
60
FA ROTEX ESU - 07/2008
10.4 Malfunctions
Tab. 10-2 Possible malfunctions of the ROTEX ESU
Malfunction
Possible cause
Possible solution
Heating system inoperable
- Main switch not lit up
- No display
No mains voltage
• Turning on ROTEX ESU main switch
• Switch the heating room main switch on.
• Replace the boiler control panel fuse.
• Replace the line connection fuse.
Heating does not warm up
Central heating standby mode disabled
- Incorrect controller setting
• Check the operating mode setting.
• Check the timer progr. or request parameters.
No heating mode despite correct
controller settings
Storage tank charging runs for too long
• Check whether storage tank charging is active.
Storage tank charging can be temporarily
interrupted by selecting a lower target hot water
temperature. If this leads to an extended period
where the temperature drops below a
comfortable level, select parallel operation
instead.
Unit in the summer switch-off state
• Correct the summer switch-off temperature or
building type setting.
Heating mode DIP switch is OFF during the tariff time
concerned
• See the "Heat generator output too low"
malfunction.
Diverter valve drive inoperable – Storage tank charging
position
• Check the valve drive/insert the connector,
change if faulty.
The valve drive can be removed temporarily, but
storage tank charging will then be impossible.
Heating pump shutdown – STLs have been triggered
• Release the STLs (see Chapter 7.3, page 51).
• Check the pump/insert the connector, change if
faulty.
Heating does not warm up enough
Heating characteristic too low
• Increase the parameter value.
Heat generator output too low
• See the "Heat generator output too low"
malfunction.
Hot water does not warm up
Storage charging standby switched off (e. g. timer is in
economy phase)
• Check the operating mode setting.
• Check the request parameters.
Hot water does not warm up enough
Storage tank charging temperature too low
• Increase the target hot water temperature.
Draw-off rate too high
• Reduce the draw-off rate, limit throughput
Heat generator output too low
• See the "Heat generator output too low"
malfunction.
Heat generator output too low
DIP switch set incorrectly
• Adjust the output setting.
• Take note of the timer programme and tariff time.
Output limited by DIP switch for standard tariff time
• No fault: ROTEX ESU can require performance
limitation during standard tariff periods.
At least one STL has been triggered. Could have been
caused by pump shutdown, water shortage or blocked
bypass.
• Have an electrician check the electric heat
generator.
Heat demand too high
• Determine the cause of the excessive heat
demand (e. g. windows open all the time, long
storage tank charging times due to high
circulation losses, incorrect dimensioning, etc.)
and remedy it if possible.
