8
Faults and malfunctions
Installation and maintenance instructions
44
Daikin Altherma EHS(X/H)
Daikin Altherma integrated solar unit
008.1444099_00 – 07/2018 – EN
Code
Component/Designation
Error
Possible fault rectification
E198
FLS flow sensor,
3-way switch valve 3UVB1
Flow measurement not plausible
Error occurs when 3UVB1 3-way switch valve is in
the bypass position, the internal circulation pump is
running but too low a volumetric flow is measured.
Required minimum water flow rate:
▪ "Heating" operating mode: 600 l/h
▪ "Cooling" operating mode: 840 l/h
▪ Automatic thawing function () active: 1020 l/h
▪ Air in heating system.
▪ Vent.
▪ Internal circulation pump is not running.
▪ Check electrical connection and controller set-
tings. If the circulation pump is defective, re-
place it.
▪ FLS flow sensor dirty, clogged.
▪ Check, clean.
▪ FLS flow sensor defective.
▪ 3UVB1 3-way switch valve drive defective.
▪ Check, replace.
E200
Electrical components
Communication fault
Communication between the RoCon BM2C and
A1P printed circuit board lost.
▪ Wiring or connections, poor contact.
▪ Check, replace
E8005 Pressure sensor DS
Water pressure in heating system too low
Water pressure has fallen below permissible min-
imum value.
▪ Insufficient water in the heating system.
▪ Check the heating system for leaks, top up wa-
ter.
▪ Pressure sensor DS defective.
▪ Check, replace.
E8100 Electrical components
Communication
Initialisation after heat pump start failed.
Printed circuit board A1P defective.
▪ Check, replace.
E9000
Temporary internal message
Not relevant for proper system operation.
E9001 Return flow temperature
sensor t
R2
Return flow temperature sensor fault
Sensor or connecting cable defective.
▪ Check, replace.
E9002 Inflow temperature sensor
t
V1
or t
V
,
BH
Inflow temperature sensor fault
Sensor or connecting cable defective.
▪ Check, replace.
E9003 Frost protection function
fault
Plate heat exchanger (PWT)
Measured value t
V1
< 0 °C
▪ Failure of the frost protection function for the plate
heat exchanger because the water flow is too low.
See fault code E9004 / 7H.
▪ Failure of the frost protection function for the plate
heat exchanger because there is a lack of refri-
gerant in the system. See fault code E9015 / E4.
