8 Faults and malfunctions
Installation and maintenance instructions
40
Daikin Altherma EHS(X/H)(B)-D
Heat pump (indoor unit) with integrated heat accumulator
008.1444099_01 – 11/2018 – EN
8 Faults and malfunctions
DANGER: RISK OF ELECTROCUTION
Electrostatic charges can lead to voltage arcing that can
destroy the electronic components.
▪ Before touching the control panel PCB, ensure potential
equalisation.
8.1 Troubleshooting
The electronics of the indoor unit indicate an error by the status dis-
play lighting red, the error screen appearing on the display and the
error symbol appearing on the start screen.
Troubleshooting: Error code E90XX
An error reset can be performed. If the same error is displayed again
shortly, the cause of the error must be found and rectified by a spe-
cialist. In the meantime, emergency operation may be maintained.
Troubleshooting: Other error codes
The cause of the error must be found and rectified by a specialist. In
the meantime, emergency operation may be maintained.
8.2 Overview of possible malfunctions
Malfunction Possible cause Possible solution
System not working
(nothing on the display,
operation LED on Ro-
Con BM2C off)
No mains voltage
▪ Switch on the system's external main switch.
▪ Switch on system fuse(s).
▪ Replace system fuse(s).
Switching time pro-
grams are not operating
or programmed switch-
ing times are carried
out at the wrong time.
The date and time are not set correctly.
▪ Set the date.
▪ Set the time.
▪ Check the weekday to switching time assignment.
Incorrect operating mode set.
▪ Set the "Automatic 1" or "Automatic 2" operating mode
During a switching time the user made a manual set-
ting (e.g. changed the target temperature, changed
the operating mode)
1 Select the "Operating mode" menu [→Main menu →Oper-
ating mode].
2 Select the correct operating mode.
The controller does not
respond to inputs
The controller's operating system has crashed.
▪ RESET the controller. To do this, disconnect the system from
the power supply for at least 10s and then switch on again.
Operating data are not
updated
The controller's operating system has crashed.
▪ RESET the controller. To do this, disconnect the system from
the power supply for at least 10s and then switch on again.
Heating does not warm
up
Requirement heating mode shut off (e.g. switching
time program is in the economy phase, outside tem-
perature is too high, parameters for optional backup
heater (EKBUxx) incorrectly set, requirement for hot
water active)
▪ Check the operating mode setting.
▪ Check the request parameters.
▪ Check the date, time and switching time program settings on
the controller.
Refrigerant compressor is not working.
▪ With backup heater (EKBUxx) installed:
▪ Check that the backup heater heats the return flow temperat-
ure to at least 15°C (at a low return flow temperature, the
heat pump uses the backup heater first to achieve this min-
imum return flow temperature).
▪ Check mains supply of the backup heater (EKBUxx).
▪ Thermal contactor (STB) on the backup heater (EKBUxx) has
triggered. Unlock.
The system is in the "Cooling" operating mode.
▪ Switch the operating mode to "Heating".
Settings for low rate mains connection do not corres-
pond to settings for electrical connections.
▪ HT/NT function is active and the [HT/NT contact] parameter is
set incorrectly.
▪ Other configurations are also possible. However, these must
match the type of low rate mains connection.
▪ The parameter [Smart grid] is active and the connections are
set incorrectly.
The electricity company has sent the peak rate sig-
nal.
▪ Wait for the repeat off-peak rate signal which reactivates the
power supply.
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