Troubleshooting can be carried out in whole or in part using these instructions. It is important that you only carry out troubleshooting where you have sufficient knowledge and experience, especially when troubleshooting where the unit is live. Acetec accepts no responsibility for personal injury or damage to property during troubleshooting in accordance with these instructions.
Alarm 8 Exhaust fan, Flashing 8 on the control panel
- Switch off the power supply to the unit and wait at least 2 minutes
- Open the unit hatch
- Spinning fan wheel by hand to rotate easily without noise
- Check for bearing faults or if impeller catches on inlet cone
Switch on power supply to unit
- Press button 1 on the control panel to switch the unit to the lowest operating mode
- NOTE! at low outdoor temperature, the supply air fan may be delayed 1 minute
Check parameter 91 via the control panel
- Press buttons 1 and 3 simultaneously for about 2 seconds until the number 1 appears on the panel
- Press button 3 until the number 91 appears on the panel
- Press and hold button 1 to read the parameter value
- The parameter value shall be 2 for A400 and 1 for all other units
Change parameter 91 if the value is incorrect
- Disconnect the power supply to the unit
- Press and hold the release button on the circuit board and switch on the power supply at the same time
- Press and hold the release button until 4 LEDs next to the release button light up alternately
- Release the acknowledge button
- Press button 3 until the number 91 appears on the panel
- Press and hold button 1 and simultaneously press button 3 until the number 2 is displayed for A400 or the number 1 for all other units
- Release button 1
- Press button 3 until the digit window goes out
Open both fan connectors (2 cross screws in the connector cover) and check the attachment of cables.
Switch on power supply to unit
- Measure in the connector closest to the fan between terminals A and B where there should be 230V AC voltage and between terminals D and E there should be between 2 to 10V NOTE! DC voltage
- Also check that there is contact between C and terminal 29 on the circuit board
Switch off power supply to unit
- Check cables on terminals 25 to 29 on circuit board by pressing orange button, check peeling about 7-10mm, wrap together, press orange button, reassemble cable and release orange button to lock cable.