Certain problems may be resolved by checking some fundamental points. Check using the list below before requesting servicing.
N.B.:
When the controller is switched on, control will only take effect after a few minutes of system initialisation.
If you have a display terminal, this displays its version number (e.g. 101) for around 5 seconds after switching on.
Upon a mains power cut:
1. when power is restored, the controller restarts automatically in the mode operating before the cut, with:
if Comfort Mode, it restarts in Comfort mode, but it is not store:
- The setpoint override returns to the middle point
- The ventilation speed returns to Auto
2. All information from the KNX bus is lost.
3. Error message: diagnostic d23 saves the last error message. d23 is saved even in case of a power cut.
Irregularity Solution
User terminal
Terminal off or no Led is lit on the terminal in comfort mode
- No 230V supply (check fuse, fused isolator, controller connection)
- Check the electrical connection between the terminal and the controller (refer to
wiring diagram)
Flashing water drop
- Check the condensate pump, the condition of the condensate pan.
Display '_ _ _' Window open
Symbol
on display
See diagnostic d22
Fan coil unit
The valves close instead of opening and vice-versa
- If the controller has just been supplied, wait for system initiation (6 mins)
- Check the electrical connection of the valves (refer to wiring diagram).
No heating
- Check that:
- The hot setpoint T°C is greater than the measured and displayed
temperature
- Any shunt in case of a 2-pipe (hot water coil only) is present between
terminals S2 and C (refer to wiring diagram).
- Any room changeover sensor, in case of a reversible 2-pipe coil, is
correctly electrically connected and that the sensing element is in contact
with the water inlet pipe
- The controller is correctly set up (refer to the Installation parameters
procedure)
- If operating with an electric heater, check that the T°C limiters are
activated.
No refrigeration
- Check that:
- The cold setpoint T°C is less than the measured and displayed
temperature
- Terminals S2 and C are not connected by a shunt in case of a 2 cold
pipes only, with or without electric heater
- Any room changeover sensor, in case of a reversible 2-pipe coil, is
correctly electrically connected and that the sensing element is in contact
with the water inlet pipe
- The controller is correctly set up (refer to the Installation parameters
procedure)
The fan always remains at high speed.
- Check that:
- The water inlet T° is correct
- The water flow is sufficient
- The installation has been correctly bled
- The control parameters are suitable (proportional band, integration time)
- The ventilation is not in manual position III
EN7515935-00 EN - 8
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