8
x
Errors, malfunctions and messages
FA ROTEX HPSU monobloc compact • 09/2017
59
E9053
JA
refrigerant pres-
sure sensor
Pressure sensor in the
outdoor unit
Pressure sensor detects an abnormal value for 3 minutes
(> 4.5 MPa or < -0.05 MPa)
Ɣ
Check the pressure sensor.
Ɣ
Check whether the current flow LED flashes at regular intervals.
Ɣ
Check whether the correct replacement part has been installed.
Ɣ
Check whether the outer main conductor plate is receiving a
power supply.
E9054
JI
W8006
—
Pressure loss
warning
Pressure sensor DS
Warning message: Maximum permissible pressure drop exceeded.
Insufficient water in the heating system.
Ɣ
Check heating system for leaks, top up water.
W8007
—
Water pressure in
heating system too
high
Warning message: water pressure has exceeded permissible maxi-
mum value.
–
Diaphragm expansion vessel defective or incorrect admission
pressure set.
Ɣ
Check, replace.
–
Parameter [Max Pressure] setting too low.
Ɣ
Set the parameter if necessary. If the setting is correct, drain
water to lower the system pressure.
Tab. 8-2 Fault codes on the HPSU monobloc compact
controller
Observe maximum temperature sensor tightening
torque (see chap. 10.3 "Tightening torque").
Refer to the heat pump outdoor unit installation instruc-
tions for information on components in the refrigerant
circuit.
Code
Malfunction /
error message
Component/
Designation
Causes and possible fault elimination
Display Internal
