Rotex HPSU compact 304 Installation And Maintenance Manual page 47

Malfunction
Water flow too low.
Target value range is too low.
Heating does not warm
Weather-controlled flow temperature regula-
up enough
tion.
Optional backup heater (BUxx) or alternative
heater not switched on.
Water quantity in heating system too low
Hot water supply is taking too much of the out-
put of the heat pump.
DIP switch configured incorrectly
Hot water supply switched off (e.g. switching
time program is in the economy phase,
parameters for hot water supply have been
set incorrectly).
Storage tank charging temperature too low.
Draw-off rate too high.
Hot water does not warm
Output of heat pump too low.
up
Water quantity in heating system too low.
Optional backup heater (BUxx) or alternative
heater not switched on.
FA ROTEX HPSU compact 4 - 06/2015
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").
Increase parameter [Heizkurve].
Increase parameter [Max Temp Heizung].
Increase parameter [Max T-Vorlauf].
Check the settings on the "HZK Konfig" level of the
parameters [Heizgrenze Tag], [Heizkurve] and the
settings in the "Raumsoll Tag"
position.
Check mains supply of the backup heater (BUxx).
Thermal protection switch (STB) on backup heater
(BUxx) was triggered. Unlock.
Check parameters [Funktion EHS] and [Leistung EHS
Stufe 1] and [Leistung EHS Stufe 2].
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 7.5).
Check the settings of the parameter [Funktion EHS] in
level "Konfiguration", sub-level "Installation".
Check the settings of the parameter [Leistung WW] in
level "Konfiguration", sub-level "Anlagenkonfigu-
ration".
Check DIP switch setting on board A1P (see
section 8.4).
Check the operating mode setting.
Check the request parameters.
Increase the target hot water temperature.
Reduce the draw-off rate, limit throughput.
Check the switching times for room heating and hot
water supply for overlaps.
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 7.5).
Check mains supply of the backup heater (BUxx).
Thermal protection switch (STB) on backup heater
(BUxx) was triggered. Unlock.
Check parameters [Funktion EHS] and [Leistung EHS
Stufe 1] and [Leistung EHS Stufe 2].
)
rotary switch
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