58
FA ROTEX HPSU compact (V5) •
8 x Errors, malfunctions and messages
Heating does not warm
up enough
Water flow too low.
Ɣ C
heck that all stop valves of the water circuit are
completely open.
Ɣ Ch
eck that the water filter is dirty.
Ɣ Check that the expansion tank is defective.
Ɣ Fully vent the heating system and device-internal
circulation pump.
Ɣ On th
e control unit (rotary switch position "Info" )
check that there is sufficient water pressure (>0.5 bar),
if necessary, refill the heating water.
Ɣ Ch
eck that the resistance in the water circuit is not too
high for the pump (see installation manual for
"Technical Data").
Target value range is too low.
Ɣ Increase
parameter [Heat-Slope].
Ɣ Increase parameter
[T vbh1 max].
Ɣ Increase parameter [Max T-Flow].
Weather-controlled flow temperature regula-
tion.
Ɣ Ch
eck the settings on the "HC Configuration" level of
the parameters [T-Outside lim day], [Heat-Slope] and
the settings in the "Set Temp Day" rotary switch
position.
Optional backup heater (BUxx) or alternative
hea
ter not switched on.
Ɣ Check mains supply of the backup heater (BUxx).
Ɣ Thermal protection switch (STB) on backup heater
(BUxx) was triggered. Unlock.
Ɣ Ch
eck the parameters [Function Heating] and [BUH s1
power] and [BUH s2 power].
Water quantity in heating system too
low
Ɣ Ch
eck 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).
Hot water supply is taking too much of the out-
put of the heat pump.
Ɣ Ch
eck the settings of the parameter [Function
Heating] in level "Configuration", sub-level "Setup".
Ɣ Ch
eck the settings of the parameter [Power DHW] in
level "Configuration", sub-level "System".
Hot water does not warm
up
DIP switch configured incorrectly
Ɣ Check DIP
switch setting on board A1P
(see chapter 8.4).
Hot water supply switched off (e.g. switching
ti
me program is in the economy phase,
parameters for hot water supply have been
set incorrectly).
Ɣ
Check the operating mode setting.
Ɣ Check the request parameters.
Storage tank charging te
mperature too low. Ɣ Increase the target hot water temperature.
Draw-off rate too high. Ɣ Reduce the draw-off rate, limit throughput.
Output of heat pump too low.
Ɣ Check the switching times for room heating and hot
water supply for overlaps.
Water quantity in heating system too
low.
Ɣ Ch
eck 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).
Optional backup heater (BUxx) or alternative
heater not switched on.
Ɣ Ch
eck mains supply of the backup heater (BUxx).
Ɣ Thermal protection switch (STB) on backup heater
(BUxx) was triggered. Unlock.
Ɣ Ch
eck the parameters [Function Heating] and [BUH s1
power] and [BUH s2 power].
Malfunction Possible cause Possible solution
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