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Code
Malfunction /
error message
Display Internal
E9001
80
Fault T-return
Fault feed flow
E9002
81
sensor
E9003
89
Fault frost protec
E9004
7H
Fault volume flow
Feed temperature
E9005
8F
t
> 75 °C
V, BH
Feed temperature
E9006
8H
t
> 65 °C
V, BH
E9007
A1
IU main board def
Coolant tempera-
E9008
A5
ture
E9009
AA
STB fault
E9010
AC
FA ROTEX HPSU monobloc compact • 09/2017
8
Component/
Designation
Sensor or connecting cable defective.
Return flow temperature
sensor t
R2
Sensor or connecting cable defective.
Feed temperature sen-
sor t
or t
V1
V, BH
Measured value t
– Failure of the frost protection function for the plate heat
Plate heat exchanger
(PWT)
– Failure of the frost protection function for the plate heat
Water flow is too low or non-existent. Required minimum water flow
rate:
Check the following items:
FlowSensorFLS
Feed temperature sen-
Feed temperature of backup heater (t
sor t
V, BH
– Feed temperature sensor delivers incorrect values. Temperature
Feed temperature sen-
sor t
V, BH
Communication between heat pump outdoor unit and internal unit
disturbed.
– Electromagnetic influences.
Printed circuit board A1P
(outdoor unit)
– Printed circuit board A1P defective.
– EEPROM read error
Refrigerant temperature outside of the valid range
Temperature sensor
No heat consumption at the plate heat exchanger.
(refrigerant fluid side) t
L2
Thermal contactor (STB) in the backup heater (BUxx) has triggered.
Optional: STB backup
heater (BUxx)
Software
Thermal contactor activated (water temperature > 85 °C)
x
Errors, malfunctions and messages
Causes and possible fault elimination
Check, replace.
Check, replace.
< 0°C
V1
exchanger because the water flow is too low. See fault code
E9004 / 7H.
exchanger because there is a lack of refrigerant in the system.
See fault code E9015 / E4.
– "Heating", "Cooling" operating mode: 420 l/h
– Automatic thawing function (
– BUxx support: 780 l/h
All stop valves of the water circuit must be completely open.
Optional water filters must not be contaminated.
Heating system must run within its operating range.
Heating system and internal circulation pump must be
completely vented.
On the controller (rotary switch position "Info"
whether sufficient water pressure (> 0.5 bar) is available; if
necessary, top up heating water.
Check function of the 3-way switch valve 3UVB1 (compare
actual position of 3UVB1 with indicated position BPV in
parameter [Overview]).
Does this fault occur during defrosting in room heating or hot
water preparation operating mode? With optional backup heater:
check its power supply and fuses.
Check fuses (pump fuse (FU1) on printed circuit board A1P
(outdoor unit) and conductor plate fuse (F1) on RoCon BM2C
printed circuit board).
Check flow sensor FLS (outdoor unit) for soiling and function; if
necessary, clean, replace.
Frost damage on the plate heat exchanger (outdoor unit)
sensor or connecting cable defective.
Check, replace.
Perform reset.
Replace printed circuit board A1P.
Check flow rate.
If flow rate is OK, replace refrigerant temperature sensor.
Check and unlock position of STL.
) active: 780 l/h
), check
) is too high.
V, BH
53
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