Heatrae Sadia ADVANCE Installer Manual page 38

The fan runs at high speed when low speed is selected and at low speed when high speed or timer
mode is selected
Cause
a) One of the RF sensors has a problem.
b) One of the ventilation unit's internal
temperature sensors is faulty.
The fan suddenly starts running much faster or slower (for no apparent reason)
Cause
a) After using the timer function, the ventilation
unit switches back to the last selected speed
before the timer was started.
b) If sensors have been paired with the ventilation
unit, it switches back to automatic mode 24
hours after being set to low or high speed.
c) The RF remote control from a neighbouring
property is paired with this ventilation unit.
The ventilation unit is not responding to the three-position switch
Cause
a) The frost protection system is active.
b) The power is switched off.
c) No power.
d) The switch wires of the three-position switch
are connected incorrectly.
e) The ventilation unit PCB is faulty.
The ventilation unit is leaking water
Cause
a) The condensate drain is not connected.
b) The condensate drain is blocked.
c) The second condensate drain is open and not
connected (hissing sound).
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Solution
See table "The ventilation unit is not
●
responding to the RF sensors".
Replace the faulty temperature sensor.
●
Solution
If desired, change the system setting.
●
If desired, change the system setting.
●
Disconnect power to the ventilation unit
●
for 15 seconds. Unpair any paired RF
remote controls (and any RF sensors) and
re-pair the remote controls (and any RF
sensors).
Solution
When the outside temperature rises
●
above -1°C, the fan will start running
again.
Install a pre-heater in the supply duct for
●
outside air.
Switch the power back on.
●
Restore power.
●
Connect the switch wires correctly (see
●
wiring diagram).
Replace the PCB and carry out the
●
commissioning procedure again.
Solution
Connect one of the two condensate
●
drains.
Unblock the condensate drain and try to
●
identify the cause of the problem.
Close the second condensate drain by
●
folding back the tab with the plug and
clicking it into the condensate drain.