Operation and Maintenance Instructions

Troubleshooting |
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8 Troubleshooting
Check or correct the following before contacting your service representative. Always check if there are any alarms ac-
tive in the control panel (chapter 9).
1. Fan(s) do not start
• Check if there are any alarm messages.
• Check the settings in the control panel (times, week schedule, auto/manual operation etc.).
• Check if the fuses has tripped.
2. Reduced airflow
• Check if there are any alarm messages.
• Check the settings for normal and low fan speed.
• Check if any reduced speed input is active.
• Check if filters need changing.
• Check that the outdoor/exhaust air damper (if used) opens.
• Check if diffusers and louvres need cleaning.
• Check diffuser/louvre openings.
• Check if fans and exchanger block need cleaning.
• Check if the roof unit or air intake is clogged.
• Check ducts for visible damage and/or build up of dust/pollution.
3. Cold supply air
• Check if there are any alarm messages.
• Check if the fans have stopped. If so the alarm relay might have tripped (shown as fan alarm in the control panel).
• Check the temperature settings in the control panel.
• Check if the extract filter must be changed.
• Check if the overheating thermostat has tripped. After the heater has cooled down, press the red button on the
electrical heater.
4. Noise/vibrations
• Check that the unit is completely levelled.
• Clean the fan impellers.
• Check that the screws holding the fans are tightened properly.
214959 | A007