6 Troubleshooting
Fault
Control unit does
not start.
Fan not respond-
ing.
Humidity sensor
slow to respond.
Programming unit
cannot be removed
from the wall.
30
Cause
Control unit switched
off.
No power supply.
Installation or mainte-
nance fault.
Programming unit sen-
sor opening blocked.
The programming unit
is still secured to the
mounting frame.
Solution
•
Switch on the control unit using the
"Up arrow" button.
•
Check the power supply unit and
power supply.
•
Check the cabling to the fan and
control unit.
•
Check the sensor opening on the
bottom of the programming unit
and clear if necessary.
•
Tighten the fixing screw on the
bottom of the programming unit
until the latch releases.