Malfunctions - Rotex HPSU compact 304 Instruction Manual

8 x Faults and malfunctions
8.2

Malfunctions

Malfunction
System not working
(Operation LED off,  No mains voltage
nothing on the display)
Time or weekday have not been set correctly.
Program clock is not
working or programmed
Program clock is deactivated.
switching times have
been carried out at the
During a switching time the user made a manual
wrong time.
setting (e.g. changed the target temperature,
changed the operating mode)
Control unit does not
Operating system of control unit crashed.
respond to entries
Operating data are not
Operating system of control unit crashed.
updated
Room heating standby switched off (e.g. time
program is in the economy phase, outside tem-
perature is too high, parameters for backup
heater (BUH) are set incorrectly, requirement
for hot water is 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 power company has sent the high-cost sig-
nal.
Water flow too low.
Target value range is too low.
Weather-dependent set value regulation is
Heating does not warm
active.
up enough
Optional: Backup heater (BUH) not switched on.
Water volume in system too low
Hot water supply is taking too much of the 
output of the heat pump.
44
Possible cause
System is in the operating mode "Cooling". ● Switch the operating mode to "heating".
Possible solution
● Switch on the external main switch of the machine.
● Switch on system fuse(s).
● Replace system fuse(s).
● Set the clock
● Set the weekday
● Activate program clock.
● Deactivate program clock and activate it again.
● Select correct operating mode.
● Carry out RESET of control unit.
● Restart system (mains voltage).
● Carry out RESET of control unit.
● Restart system (mains voltage).
● Have the system checked by a ROTEX heating
technician.
● Check the operating mode setting.
● Check the request parameters.
● Check the setting of time a weekday in the control
system.
● Have the system checked by a ROTEX heating
technician.
● Have the system checked by a ROTEX heating
technician.
● Wait for the repeat off-peak rate signal which reacti-
vates the power supply.
● Check that all stop valves of the water circuit are
completely open.
● Bleed system completely.
● Using the controller (rotary switch position
whether sufficient water pressure (> 0.5 bar) is
available.
● Have the system checked by a ROTEX heating
technician.
● Have the system checked by a ROTEX heating
technician.
● Check the settings on the level "HC Configuration" of
the parameters [T-Outside lim day], [Heat-Slope] and
the settings in the rotary switch position
● Have the system checked by a ROTEX heating
technician.
● Check water volume and associated primary
pressure in expansion container, top up with water or
reconfigure primary pressure (see installation manual
for heat generator).
● Check the settings of the parameter [Equilibrium
Temp] in level "Configuration", sub-level "System
Configuration".
● Have the system checked by a ROTEX heating
technician.
BA ROTEX HPSU compact 4 - 09/2013
) check
.