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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
57
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)
●
Check the pressure sensor.
●
Check whether the current flow LED flashes at regular intervals.
●
Check whether the correct replacement part has been installed.
●
Check whether the outer main conductor plate is receiving a
power supply.
E9054
JI
W8006 —
Pressure loss
warning
Pressure sensor P
hyd
Warning message: Maximum permissible pressure drop exceeded.
Insufficient water in the heating system.
●
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.
●
Check, replace.
– Parameter [Max Pressure] setting too low.
●
Set the parameter if necessary. If the setting is correct, drain
water to lower the system pressure.
Tab.
8-2 Fault codes on the Altherma M ECH
2
O
controller
Observe maximum temperature sensor tightening
torque (see chap.
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