8
x
Errors, malfunctions and messages
FA ROTEX HPSU monobloc compact • 09/2017
51
Internal circulation pump
generates excessively
high operating noises
Air in the water circuit.
Ɣ
Completely vent the heating system and the internal
circulation pump.
Noises caused by vibrations.
Ɣ
Check the HPSU monobloc compact, its components
and covers to ensure they are fastened correctly.
Bearing damage in the internal circulation
pump
Ɣ
Reduce pump speed (parameters [Min Perform Pump]
and [Max Perform Pump]).
Ɣ
Replace the internal circulation pump.
Water pressure at pump inlet too low.
Ɣ
On the controller (rotary switch position
"Info"
),
check whether sufficient water pressure (> 0.5 bar) is
available; if necessary, top up heating water.
Ɣ
Check whether the pressure gauge is working
correctly (connection of an external pressure gauge).
Ɣ
Check admission pressure in the expansion tank and
water pressure; if necessary, top up heating water and
adjust admission pressure (see chap. 7.4).
Safety pressure relief
valve is leaking or always
open.
Expansion tank is defective.
Ɣ
Replace expansion tank.
Water pressure in heating system is too high.
Ɣ
On the controller (rotary switch position
"Info"
),
check whether the water pressure is below the
specified maximum pressure. If necessary, drain suffi-
cient water until the pressure is in the middle of the
permissible range.
Safety pressure relief valve is stuck.
Ɣ
Check safety pressure relief valve and if necessary,
replace it.
–
Turn the red knob on the safety pressure relief
valve counterclockwise. If you can hear a rattling
noise, the safety pressure relief valve needs
replacing.
Tab. 8-1 Possible malfunctions on the HPSU monobloc compact
Malfunction
Possible cause
Possible solution
