Fault Codes - Rotex HPSU compact (V5) Installation And Maintenance Manual

8 x Errors, malfunctions and messages
Malfunction
Air in the water circuit
Noises caused by vibrations.
Bearing damage in the device-internal circula-
tion pump.
Device-internal circula-
tion pump is excessively
noisy while running
Water pressure at pump inlet too low.
Expansion tank is defective.
Water pressure in the heating system is too
high.
Safety pressure relief
valve is leaking or always
open.
Safety pressure relief valve is stuck.
Tab. 8-1 Possible malfunctions of the HPSU compact

8.3 Fault codes

In the case of all malfunctions / error messages due to possibly defective sensors, all associated connection cables, con-
nection points (plug contacts correctly in place) and printed circuit boards must be checked before replacing the sensor.
Component allocation: see fig. 3-1 to fig. 3-5 and fig. 8-4
Code Malfunction /
Error message
Display Internal
E9001 80 Fault T-return
E9002 81 Fault feed flow
Frost protection
E9003 89
function error
60
Possible cause
Component/Designation
Return flow temperature
sensor t
R2
Flow temperature sensor
t or t
V2 V, BH
Plate heat exchanger
(PHE)
Possible solution
Fully vent the heating system and device-internal
circulation pump.
Check the HPSU compact, its components and covers
to ensure they are fastened correctly.
Reduce pump speed [Min Perform Pump] and [Max
Perform Pump]).
Replace device-internal circulation pump.
On the controller (rotary switch setting "Info"
check whether there is adequate water pressure
(>0.5 bar).
Check that the pressure gauge is working correctly
(connect an external pressure gauge).
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).
Replace expansion tank.
On the control unit (rotary switch position "Info"
check that the water pressure lies beneath the stated
maximum pressure. If necessary, bleed the water until
the pressure lies in central permissible range.
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.
Causes and possible error correction
Sensor or connection cable defective.
Check, replace.
Sensor or connection cable defective.
Check, replace.
Measured value t < 0 °C
V2
– Failure of the frost protection function for the plate heat
exchanger because the water flow is too low. See error code
E9004 / 7H.
– Failure of the frost protection function of the plate heat
exchanger because there is a lack of coolant in the system.
See error code E9015 / E4.
FA ROTEX HPSU compact (V5) •
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