8 x Errors, malfunctions and messages
FA ROTEX HPSU compact (V5) •
57
8.2 Malfunctions
Malfunction Possible cause Possible solution
System not working
(nothin
g on the display,
operation LED on
RoCon BM1 off)
No mains voltage
Ɣ Sw
itch on the external main switch of the machine.
Ɣ Switch on system fuse(s).
Ɣ Replace system fuse(s).
Switching time program
is not
working or pro-
grammed switching times
are bei
ng carried out at
the wrong time.
Date and time are not correctly set.
Ɣ Se
t date.
Ɣ Set time.
Ɣ C
heck week day-switching time allocation.
Incorrect operating mode set. Ɣ Set to operating mode "Automatic 1" or "Automatic 2".
During a switching time the user made a man-
ual setting (e.g. changed the target tempera-
ture, changed the operating mode)
1. Place the rotary switch in the "Info" position.
2. Place the rotary switch in the "O
perating Mode"
position.
3. Select correct operating mode.
Controller does not react
to
inputs
Operating system of control unit
crashed.
Ɣ C
arry out RESET of control unit. To do so, disconnect
the system from the power supply for at least 10 s and
the
n switch on again.
Operating data are not
updated
Operating system of control unit
crashed.
Ɣ C
arry out RESET of control unit. To do so, disconnect
the system from the power supply for at least 10 s and
then switch on again.
Heating does not warm
up
Heating request switched off (e.g. switching
time prog
ram is in the setback phase, external
temperature is too high, parameters for
optional backup heater (BUxx) are set incor-
rectly, hot water request is active)
Ɣ Check the operating mode setting.
Ɣ Check the request parameters.
Ɣ C
heck setting of the date, time and switching time
program on the control unit.
Coolant compressor is not working.
Ɣ With installed backup heater (BUxx):
Check whether the return flow temperature backup
heater heats up to at least 15 °C (if the return flow
temperature is low, the heat pump first uses the
backup heater in order to reach this minimum return
flow temperature).
Ɣ C
heck mains supply of the backup heater (BUxx).
Ɣ Thermal protection switch (STB) on backup heater
(BUxx) was triggered. Unlock.
System is in the operating mode
"Cooling".
Ɣ Swi
tch the operating mode to "Heating".
Settings for off-peak mains connection do not
correspo
nd to settings for electrical connec-
tions.
Ɣ H
T/NT function is active and the parameter [HT/NT
Contact] is set incorrectly.
Other configurations are also possible. However,
the
se must match the type of off-peak mains
connection.
Ɣ T
he parameter [SMART GRID] is active and the
connections are set incorrectly.
The power company has sent the high-cost
sign
al.
Ɣ Wait for the repeat off-peak rate signal which reacti-
vates the power supply.
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