Rotex HPSU compact (V5) Installation And Maintenance Manual page 58

Malfunction
Water flow too low.
"Cooling" switched off (e.g. room thermostat
requires "Cooling", but switching time pro-
gram is in economy phase, outside tempera-
Room cooler does
ture too high).
not cool
Coolant compressor is not working.
System is in the operating mode "Heating".
Outdoor temperature < 4 °C
Water flow too low.
Cooling effect of
room cooling insufficient
Water quantity in heating system too low.
Quantity of coolant in the heating system too
low or too high.
FA ROTEX HPSU compact (V5) •
8 x
Possible cause
Errors, malfunctions and messages
Possible solution
Check that all stop valves of the water circuit are
completely open.
Check that the water filter is dirty.
Check that the expansion tank is defective.
Fully vent the heating system and device-internal
circulation pump.
On the control unit (rotary switch position "Info"
check that there is sufficient water pressure (>0.5 bar),
if necessary, refill the heating water.
Check that the resistance in the water circuit is not too
high for the pump (see installation manual for
"Technical Data").
Check the operating mode setting.
Check the request parameters.
Check setting of the date, time and switching time
program on the control unit.
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).
Check mains supply of the backup heater (BUxx).
Thermal protection switch (STB) on backup heater
(BUxx) was triggered. Unlock.
Switch the operating mode to "Cooling".
The heat pump has automatically switched to the "Heating"
operating mode so as to be able to guarantee frost protec-
tion should the external temperature drop further. Room
cooling not possible.
Check that all stop valves of the water circuit are
completely open.
Check that the water filter is dirty.
Check that the expansion tank is defective.
Fully vent the heating system and device-internal
circulation pump.
On the control unit (rotary switch position "Info"
check that there is sufficient water pressure (>0.5 bar),
if necessary, refill the heating water.
Check that the resistance in the water circuit is not too
high for the pump (see installation manual for
"Technical Data").
Check the primary pressure in the expansion
container and the water pressure, if necessary, refill
the heating water and reset the primary pressure
(see chapter 7.4).
Determine the cause for the coolant being too low or
too high in the coolant circuit.
If the quantity of coolant is too low, check the cool-
ant circuit for leaks, repair and top up the coolant.
If the quantity of coolant is too great, recycle the
coolant and refill the system with the correct vol-
ume.
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