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8
x
Errors, malfunctions and messages
8.2
Malfunctions
Malfunction
System not working
(nothing on the display,
No mains voltage
operation LED on
RoCon BM2C off)
The date and time are not set correctly.
Switching time programs
are not operating or pro-
Incorrect operating mode set.
grammed switching times
are carried out at the
During a switching time the user made a man-
wrong time.
ual setting (e.g. changed the target tempera-
ture, changed the operating mode)
The controller does not
The controller's operating system has
respond to inputs
crashed.
Operating data are not
The controller's operating system has
updated
crashed.
Requirement heating mode shut off (e.g.
switching time program is in the economy
phase, outside temperature is too high,
parameters for optional backup heater
(EKBUxx) incorrectly set, requirement for hot
water active)
Refrigerant compressor is not working.
Heating does not warm
up
Settings for off-peak mains connection do not
correspond to settings for electrical connec-
tions.
The electricity company has sent the peak
rate signal.
Installation and maintenance instructions
46
Possible cause
System is in "Cooling" operating mode.
Possible solution
● Switch on the system's external main switch.
● Switch on system fuse(s).
● Replace system fuse(s).
● Set the date.
● Set the time.
● Check the weekday to switching time assignment.
● Set "Automatic 1" or "Automatic 2" operating mode.
1. Set the rotary switch to the "Info"
2. Set the rotary switch to the "Operating Mode"
position.
3. Select correct operating mode.
● RESET the controller. To do this, disconnect the
system from the power supply for at least 10 s and
then switch on again.
● RESET the controller. To do this, disconnect the
system from the power supply for at least 10 s and
then switch on again.
● Check the operating mode setting.
● Check the request parameters.
● Check the date, time and switching time program
settings on the controller.
● With installed backup heater (EKBUxx):
check whether the backup heater heats the return
temperature to at least 15 °C (at a low return temper-
ature, the heat pump uses the backup heater first to
achieve this minimum return temperature.).
● Check mains supply of the backup heater (EKBUxx).
● Thermal contactor (STB) on the backup heater
(EKBUxx) has triggered. Unlock.
● Switch the operating mode to "Heating".
● HT/NT function is active and the parameter [HT/NT
Contact] is set incorrectly.
Other configurations are also possible. However,
these must match the type of off-peak mains
connection.
● The parameter [SMART GRID] is active and the
connections are set incorrectly.
● Wait for the repeat off-peak rate signal which reacti-
vates the power supply.
position.
Daikin Altherma M ECH
O
2
Solar storage tank with heating controller
008.1446799_00 – 07/2019 – EN
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