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8
Faults and malfunctions
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.
8.2
Overview of possible malfunctions
Malfunction
System not working
No mains voltage
(nothing on the display,
operation LED on Ro-
Con BM2C off)
Switching time pro-
The date and time are not set correctly.
grams are not operating
or programmed switch-
ing times are carried
Incorrect operating mode set.
out at the wrong time.
During a switching time the user made a manual set-
ting (e.g. changed the target temperature, changed
the operating mode)
The controller does not
The controller's operating system has crashed.
respond to inputs
Operating data are not
The controller's operating system has crashed.
updated
Heating does not warm
Requirement heating mode shut off (e.g. switching
up
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)
Refrigerant compressor is not working.
The system is in the "Cooling" operating mode.
Settings for low rate mains connection do not corres-
pond to settings for electrical connections.
The electricity company has sent the peak rate sig-
nal.
Installation and maintenance instructions
40
8.1
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.
Possible cause
Troubleshooting
Possible solution
▪ Switch on the system's external main switch.
▪ Switch on system fuse(s).
▪ Replace system fuse(s).
▪ Set the date.
▪ Set the time.
▪ Check the weekday to switching time assignment.
▪ Set the "Automatic 1" or "Automatic 2" operating mode
1
Select the "Operating mode" menu [→ Main menu → Oper-
ating mode].
2
Select the correct operating mode.
▪ RESET the controller. To do this, disconnect the system from
the power supply for at least 10 s and then switch on again.
▪ RESET the controller. To do this, disconnect the system from
the power supply for at least 10 s and then switch on again.
▪ Check the operating mode setting.
▪ Check the request parameters.
▪ Check the date, time and switching time program settings on
the controller.
▪ 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.
▪ Switch the operating mode to "Heating".
▪ 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.
▪ Wait for the repeat off-peak rate signal which reactivates the
power supply.
Heat pump (indoor unit) with integrated heat accumulator
Daikin Altherma EHS(X/H)(B)-D
008.1444099_01 – 11/2018 – EN
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