5 x Faults and malfunctions
52
BA ROTEX HPSU compact 2 - 04/2011
5.3 Fault codes
Circulation pump is being
excessively noisy while
running
Air in the water circuit. • Bleed the entire water circuit.
Noises caused by vibrations.
• Check the HPSU compact, its components and covers to ensure
they are fastened correctly.
Bearings damage in the circulation pump. • Reduce speed of pump, replace circulation pump.
Water pressure at pump inlet too low.
• Check on pressure gauge whether there is sufficient water
pressure (>0.3 bar).
• Check that the pressure gauge is working correctly.
• Check that the expansion tank is not defective and that the
primary pressure has been set correctly (see installation manual
HPSU compact).
Safety pressure relief valve
is leaking or always open.
Expansion tank is defective. • Replace expansion tank.
Water quantity or water pressure in the system is
too high.
• Check water pressure at pressure gauge (must be below the
maximum pressure given) and if necessary, release some water
until the pressure is in the mid-range.
Safety pressure relief valve is stuck.
• Check safety pressure relief valve and if necessary, replace it.
– Turn the red knob on the safety pressure relief valve counter-
clockwise. If you can hear a rattling noise, the safety pressure
relief valve needs replacing.
– Close the inlet and discharge stop valve if water is continuously
escaping.
Display shows:
Selected function is not available for this type of
system.
Selected function is blocked for the user by the
parameter "Access authority".
• Changing the access authorisation in parameter [0-00]
Tab. 5-2 Possible malfunctions of the HPSU compact
Malfunction Possible cause Possible solution
Fault code Component/Designation Fault and possible causes
80
Temperature sensor feed water
temperature
Flow temperature sensors t
V1
and t
V2
are faulty (for position of components, see chapter 2
"Product description").
81
Temperature sensor discharge water
temperature
Return line temperature sensors t
R1
and t
R2
are faulty (for position of components, see chapter 2
"Product description").
89
Failure of the frost protection function of
the water heat exchanger
Failure of the frost protection function of the water heat exchanger because the water flow is
too low. See fault code "7H".
Failure of the frost protection function of the water heat exchanger because there is a lack of
refrigerant in the system.
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