Error Codes - Daikin Altherma M ECH2O Series Installation And Maintenance Instructions Manual

8 x Errors, malfunctions and messages

8.3 Error codes

In the case of all malfunctions / error messages due to possible defective sensors, always check all accompanying connec-
tion cables, connecting points (plug contacts seated correctly) and printed circuit boards before exchanging them.
Component assignment: see fig. 3-1 to fig. 3-3 and fig. 8-4
Code Malfunction /
error message
Display Internal
Fault feed flow
E75 —
sensor
Storage tank tem-
E76 — perature sensor
fault
E81 —
Communication
E88 —
fault
E91 —
Fault T-return
E128 —
Fault pressure
E129 —
sensor
Flow measure-
E198 —
ment not plausible
Communication
E200 —
fault
Water pressure in
E8005 — heating system too
low
E8100 — Communication
Installation and maintenance instructions
50
Component/
Designation
Feed temperature sensor defective.
Feed temperature sen-
sor t
● Check, replace.
V, BH
Storage tank temperature sensor t
tive or not connected.
Storage tank tempera-
ture sensor t
● Check, replace.
DHW
● Check [Storage Config] setting.
Parameter storage in the EEPROM disturbed.
Circuit
boardRoCon BM2C
● Contact a Daikin service technician.
Parameter storage in the external flash memory disturbed.
Circuit
boardRoCon BM2C
● Contact a Daikin service technician.
Connected CAN mod-
CAN module bus ID duplicated, set unique data bus address.
ules
Return flow temperature sensor t
Return flow temperature
sensor t (outdoor unit)
● Check, replace.
R
Pressure sensor P
Pressure sensor P
hyd
● Check, replace.
Error occurs when 3-way switch valve 3UVB1 is in bypass position,
the internal circulation pump is running but a volumetric flow that is
too low is measured.
Required minimum water flow rate:
"Heating" operating mode
"Cooling" operating mode
Flow sensor FLS (out-
Automatic defrost function active
door unit),
3-way switch
– Air in heating system.
valve3UVB1
– Internal circulation pump is not running.
– Flow sensor FLS dirty, clogged.
– Flow sensor FLS defective.
– 3-way switch valve 3UVB1 valve drive defective.
Communication between RoCon BM2C and printed circuit board
A1P is disturbed.
Electrical components
– Outdoor unit is not connected
– Wiring or connections, poor contact.
Water pressure has fallen below permissible minimum value.
– Insufficient water in the heating system.
Pressure sensor P
hyd
– Pressure sensor P
Initialisation after heat pump start failed.
Electrical components
Printed circuit board A1P (outdoor unit) defective.
● Check, replace.
Causes and possible fault elimination
defective.
hyd
● Vent.
● Check electrical connection and controller settings. If circu-
lation pump is defective, replace it.
● Check, clean.
● Check, replace.
● Check, replace
● Check heating system for leaks, top up water.
defective.
hyd
● Check, replace.
or connecting cable defec-
DHW
connecting cable defective.
R
5-7 kW 11-16 kW
480 l/h 600 l/h
600 l/h 900 l/h
780 l/h 900 l/h
Daikin Altherma M ECH
Solar storage tank with heating controller
008.1446799_00 – 07/2019 – EN
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