Alarm list

How to check alarm list in units with C6.1 control panel.

Below you can find alarm list:

Code Alarm text Comment Troubleshooting tips
Text Hex
F1   Low supply airflow

Supply airflow not reached in CAV mode

1. Fan failure,

2. Damaged/wrong wiring,

3. Clogged filters,

4. Incorrect sensor mounting in the duct,

Troubleshooting guide

F2   Low extract airflow Extract airflow not reached in CAV mode

1. Fan failure,

2. Damaged/wrong wiring,

3. Clogged filters,

4. Incorrect sensor mounting in the duct,

Troubleshooting guide

F3   Return water temperature too low Return water temperature < 8 oC

Damaged sensor wiring, faulty sensor,

Troubleshooting guide

F4   Low supply air temperature Supply air temperature below +5 oC

Faulty sensor, faulty heating system/control,

Troubleshooting guide

F5   High supply air temperature Supply air temperature higher than 45 oC (for 10 min)

Faulty sensor, faulty heating system/control,

Troubleshooting guide

F6   Electric heater overheat Activated eletrical heater protection relay (TK100)

Reset relay by pressing "RESET" button. 

Troubleshooting guide

F7   Heat exchanger failure Rotory/plate heat exchanger efficiency dropped below critical value

1. Rotor not working

2. In CF units, bypass damper not working correctly

3. Faulty sensors 

4. Air mixing between section causing low efficiency

Troubleshooting guide

F8   Heat exchanger freezing  

Only occurs in winter conditions.

1. Rotor efficiency dropped below critical value

2. Pressure drop through plate heat exchanger increased above critical value

Troubleshooting guide

F9   Internal fire Supply air temperature higher than 70 oC OR extract air temperature higher than 50 oC.

Faulty sensor, faulty heating system/control

Troubleshooting guide

F10   External fire  Signal recieved from external fire system

C6 controller board connections 25-26

Troubleshooting guide

F11   Sensor failure Short circuit in supply air temperature circuit (B1)

Wrong/damaged wiring, faulty sensor

Troubleshooting guide

F12   Open circuit in supply air temperature circuit (B1)
F13   Sensor failure Short circuit in extract air temperature circuit (B2)

Wrong/damaged wiring, faulty sensor

Troubleshooting guide

F14   Open circuit in extract air temperature circuit (B2)
F15   Sensor failure Short circuit in outdoor air temperature circuit (B3)

Wrong/damaged wiring, faulty sensor

Troubleshooting guide

F16   Open circuit in outdoor air temperature circuit (B3)
F17   Sensor failure Short circuit in exhaust air temperature circuit (B4)

Wrong/damaged wiring, faulty sensor

Troubleshooting guide

F18   Open circuit in exhaust air temperature circuit (B4)
F19   Sensor failure Short circuit in return water temperature circuit (B5)

Wrong/damaged wiring, faulty sensor

Troubleshooting guide

F20   Open circuit in return water temperature circuit (B5)
F21   Sensor failure Short circuit in supply after heat exchanger air temperature circuit (B14)

Wrong/damaged wiring, faulty sensor

Troubleshooting guide

F22   Open circuit in supply after heat exchanger air temperature circuit (B14)
F23   Controller failure Flash fail Controller failure
F24   Too low 24V supply voltage Controller failure
F25   Too high 24V supply voltage Controller failure
F26   24V Supply Voltage Overloaded Controller failure
F28   Sensor failure Room temperature sensor failure

Wrong/damaged wiring, faulty sensor, wrong configuration

F29   Sensor failure Room humidity sensor failure, plate exchanger defrost

Wrong/damaged wiring, faulty sensor, wrong configuration

F30   Sensor failure Humidity Sensor failure (dehumidification control)

Wrong/damaged wiring, faulty sensor, wrong configuration

Alarm shows up when humidity sensor AND humidity control function is activated

but no humidity signal is received.

Troubleshooting guide

F31   Sensor failure Impurity sensor failure

Wrong/damaged wiring, faulty sensor, wrong configuration

Alarm shows up when impurity sensor AND impurity control function is activated but no

impurity signal is received.

Troubleshooting guide

 
W1   Clogged filters   Change filters and reset filter impurity level
W2   Service mode   Message appears when modifications are made in service level. Reset alarms to delete
W3   Low return water temperature    
W4   Sensor failure Humidity Sensor Failure

Wrong/damaged wiring, faulty sensor bad configuration. No signal received from sensor to controller

Alarm shows up when humidity sensor is activated AND no humidity control function is activated 

W5   Sensor failure Impurity sensor failure

Wrong/damaged wiring, faulty sensor, bad configuration. No signal received from sensor to controller

Alarm shows up when impurity sensor is activated AND no impurity signal is received.

W6   Heat exchanger failure Low heat exchanger efficiency No communication with rotor motor control board

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