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8
x
Errors, malfunctions and messages
Daikin Altherma M ECH
2
O
Solar storage tank with heating controller
008.1446799_00 – 07/2019 – EN
Installation and maintenance instructions
51
E9000
—
Temporary internal
message
—
Not relevant for proper system operation.
E9001
80
Fault T-return
Return flow temperature
sensor t
R2
Sensor or connecting cable defective.
●
Check, replace.
E9002
81
Fault feed flow
sensor
Feed temperature sen-
sor t
V1
or t
V,
BH
Sensor or connecting cable defective.
●
Check, replace.
E9003
89
Fault frost protec
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 refrigerant in the system.
See fault code E9015 / E4.
E9004
7H
Fault volume flow FlowSensorFLS
Water flow is too low or non-existent. Required minimum water flow
rate:
5-7
kW
11-16
kW
"Heating" operating mode
480
l/h
600
l/h
"Cooling" operating mode
600
l/h
900
l/h
Automatic defrost function active
780
l/h
900
l/h
Check the following items:
●
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"
), check
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)
E9005
8F
Feed temperature
t
V,
BH
>
75 °C
Feed temperature sen-
sor t
V,
BH
Feed temperature of backup heater (t
V,
BH
) is too high.
– Feed temperature sensor delivers incorrect values. Temperature
sensor or connecting cable defective.
●
Check, replace.
E9006
8H
Feed temperature
t
V,
BH
>
65 °C
Feed temperature sen-
sor t
V,
BH
E9007
A1
IU main board def
Printed circuit board A1P
(outdoor unit)
Communication between heat pump outdoor unit and internal unit
disturbed.
– Electromagnetic influences.
●
Perform reset.
– Printed circuit board A1P defective.
●
Replace printed circuit board A1P.
– EEPROM read error
E9008
A5
Coolant tempera-
ture
Temperature sensor
(refrigerant fluid side) t
L2
Refrigerant temperature outside of the valid range
No heat consumption at the plate heat exchanger.
●
Check flow rate.
●
If flow rate is OK, replace refrigerant temperature sensor.
Code
Malfunction /
error message
Component/
Designation
Causes and possible fault elimination
Display Internal