VTR 100B LITE Installation and Service manual v2

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Service
9.5 Alarm list
Alarm Explanation Do the following
Fan
Indicates error on either supply or
extract air fan.
The alarm is displayed in the control panel.
Check that quick connectors are connected for the both fans.
Contact your installation company or place of purchase.
EMT/Frost
Indicates triggered frost protection (in
case of installed water heating
battery) or triggered overheat
protection (in case of installed electric
re-heater battery).
A triggered frost protection alarm results in the following:
• Both fans stop.
• Outdoor and exhaust air dampers closed.
• Water valve opens completely (10 V signal goes out to
the actuator).
The unit will restart once the water temperature reaches +5°
C above the set frost protection temperature.
A triggered over heat protection (EMT) gives an alarm in the
control panel.
Reset by pushing the reset button.
If the problem continues contact your installation company
or place of purchase.
Rot
Indicates a rotor malfunction. The alarm is displayed in the control panel.
• If the rotating heat exchanger has stopped. Check the
rotor belt. See chapter 9.6
• If the heat exchanger is still rotating, check that the quick
connector for the sensor is connected and that there is an
air gap of 5-10mm between the sensor and the magnet.
Adjust the gap if necessary.
If the alarm persists, the rotor sensor may be faulty.
Contact your installation company or place of purchase.
Pb Fail
Error in connection with relay card for
the electrical re-heater (if installed
and activated).
The overheat protection sensor,
automatic reset (ET2) may be
triggered due to high temperature.
The alarm is displayed in the control panel.
The heater will not be activated.
For triggered ET2, wait 10–15 min. If the error remains,
contact your installation company or place of purchase.
Temp
Malfunction in one or more of the
temperature sensors.
The alarm is displayed in the control panel.
Contact your installation company or place of purchase.
Filter
Time for filter change. The alarm is displayed in the control panel.
Change filter according to the instructions in the User
Manual.
Low SS
Indicates low supply air temperature The alarm is displayed in the control panel.
If water reheater is configured and frost protection have
failed, then an extra security function is triggered when
supply air temperature is lower than 5 °C and outdoor air
temperature is below 0 °C.
RH
Indicates malfunction of internal
relative humidity sensor.
The alarm is displayed in the control panel.
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