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UAB KOMFOVENT we reserve the right to make changes without prior notice
DOMEKT_C8_guide_21-07
EN
4. TROUBLESHOOTING
Device automation continuously monitors the operation of various components and function algorithms. If something
goes wrong, the device informs you with a message and an audible alarm from a control panel (alarm may be disabled).
Messages are divided into critical alarms and notifications. Critical alarms occur when the device cannot continue operation
without intervention of the user or an authorised service representative. Notifications are used to warn the user about
possible faults or small discrepancies but they do not stop the device.
In case of a message, perform the following actions:
• Read the message and note its number displayed on screen (control panel, computer, smartphone).
• Stop the unit. If heating/cooling devices were running at that time, pressing the OFF button will keep the unit running for
a few minutes until heater/cooler temperature is stabilized.
• Once the unit stops, unplug it from the mains.
• Find tips in the “Message Table” by the message number (see Chapter 4.1).
• If possible, eliminate the cause. If a fault cannot be resolved, contact an authorized service representative.
• After troubleshooting, make sure no foreign objects, debris or tools are left inside the unit, and only then close the unit
door.
• Connect the unit to the mains and delete all alarms from the message window.
• If a fault is not resolved, depending on its nature, the device may not start or may start and display an alarm after a while.
•
Before performing any work inside the unit, make sure that the device is stopped and unplugged.
•
After stopping the unit, wait a few minutes for the fans to stop rotating and the heating devices
to cool down before opening the door.
4.1. Table of messages
Below is a list of messages and recommended actions to resolve faults. These messages are displayed in the C6.1 control
panel, mobile app or a computer. F stands for critical alarms, W – for notifications.
Code
Message
Possible cause
User‘s actions
F3
Return water
temperature low
1. No hot water in the water heater
system.
2. Circulation pump not working.
3. Water control valve or actuator not
working.
4. Return water temperature sensor is
faulty or installed incorrectly.
1. Check if hot water is in the system.
2. Check if a circulation pump is working.
3. Check if a water control valve is opening.
4. Check whether a return water sensor is installed according to
the directions specified in “Installation Manual”. Contact your
installer or authorized service.
F4
Low supply air
temperature
1. Integrated heaters not working.
2. Additional heating/cooling devices
faulty or installed incorrectly.
3. Faulty air temperature sensor.
1. Contact authorised service.
2. Contact the company that installed or sold additional heating/
cooling equipment.
3. Contact authorised service.
F5
High supply air
temperature
1. Integrated heaters malfunctioning.
2. Additional heating/cooling de-
vices malfunctioning or installed
incorrectly.
3. Faulty air temperature sensor.
1. Contact authorised service.
2. Contact the company that installed or sold additional heating/
cooling equipment.
3. Contact authorised service.
F7
Heat exchanger
failure
1. Rotor heat exchanger not rotating
(only for DOMEKT R devices).
2. Air bypass damper of the counter-
flow heat exchanger malfunctioning
(only for DOMEKT CF units).
1. Check for foreign objects or debris preventing rotation of the
rotor drum. Check if the rotor belt is not torn.
2. Contact authorised service.
F8
Heat exchanger
icing
1. Antifreeze protection of the heat
exchanger is malfunctioning.
2. Antifreeze protection is switched off
and outside air temperature is below
-4 °C.
1. Check the antifreeze protection settings. Check if an external
pre-heater is working, if used.
2. Check antifreeze protection settings. If an integrated or
external pre-heater is not used, you will not be able to use a
device with a counter-flow heat exchanger when the outside
temperature drops below -4 °C.