32
Trouble shooting
This section shows how to acknowledge and understand possible operation errors .
Errors are indicated by an LED located under the filter reset button . If the LED slowly flashes
orange, it means you need to replace the air filters . See page 29 .
If this LED is red it indicates an operating error . The red LED can indicate three different errors:
LED Red
Description
Flashing slowly
• Error on the bypass damper
• Error on the internal temperature sensor T3/T4
Flashing rapidly
• Error on the fan
• Supply temperature is <+5°C
• External fire alarm is activated
• One of the internal temperature sensors is measuring >70°C
Lights constantly
• T1/T2 Temperature sensor is defective
If the LED flashes RED then there is an operating error . The length of the flash corresponds to
an error code with corresponding digits in the left column of the table below, followed by a 5
second break .
Number of
flashes
Error number
Control panel
Error
1
E1
Exhaust fan
2
E2
Supply fan
3
E3
Bypass damper
4
E4
Outside air temperature sensor (T1)
5
E5
Supply air temperature sensor (T2)
6
E6
Extracted air temperature sensor (T3)
7
E7
Exhaust air temperature sensor (T4)
8
E8
Indoor air temperature sensor (T5)
9
E9
Humidity sensor, RH% (Accessory)
10
E10
Outside temperature < -13 °C
11
E11
Supply air temperature < +5 °C
12
E12
Fire alarm, one or more of the internal sensors are measur-
ing a temperature above 70 °C .
13
E13
Communication error / poor signal
14
E14
Fire alarm, thermostat in the duct system (Accessory)
15
E15
High water level
Errors are displayed on the HRC3 remote control with an “E” + a number . The error can then
be looked up in the troubleshooting overview and in the control panel’s manual for rectifying
errors .
Operating warnings and errors are logged in the controller’s memory . Connect a computer
with PC-Tool installed via USB to output detailed information from the logfile .
A restart of the unit (disconnect/connect 230V) will reset the controller and start the unit up
in standard operating mode .
The controller will subsequently check for any errors . This can take up to 15 minutes .
Introduction
Error signalling
LED displays
Software ≥2 .0
Error messages
on the remote
control’s LCD panel
PC-Tool
Reset the unit after
a restart
