Troubleshooting 7 - Vaillant recoVAIR/3 SERIES Operating And Installation Manual

7 Troubleshooting
The faults listed below may only be rectified by an ex-
pert technician.
• Make sure the parts are correctly fitted and that their
original position and alignment are retained.
Malfunction Cause
The unit does not op- Temporary interruption of the mains voltage sup-
erate ply or no supply at all. Power supply circuit break-
er tripped. Electricity disconnector was activated.
Fuse F1 in the unit is defective.
Unit operation is very No silencers in the fresh air and exhaust air ducts.
loud even at the mini- Wrong silencers, or silencers are too short. Filters
mum fan speed are extremely soiled.
Ventilators are defective or heavily soiled.
None or insufficient Filters are extremely soiled.
fresh air supply Fresh air valves/grilles closed too much.
Exhaust air or fresh air ducts obstructed.
Fresh air input louvre too small.
Incorrect wiring.
Fan defective.
No or insufficient Filters are extremely soiled.
exhaust air flow Exhaust air valves closed too much.
(i.e. in the bathroom Exhaust air or fresh air ducts obstructed.
the mirror stays Fresh air input louvre too small.
fogged up) Incorrect wiring.
Fan defective.
Bypass summer mode Bypass function not activated or set days for
does not work summer mode expired.
Incorrect positioning of the temperature sensor.
Flap position and/or motor for bypass defective.
Defective bypass motor wiring.
Noise in the conden- Drain trap incorrectly connected.
sation water drain
trap
Water dripping from Exhaust air and fresh air ducts are not vapour-
the unit sealed.
Fresh air too cold Exhaust air and fresh air flows not balanced.
Wrong flap position and bypass motor defective.
No fresh air or ex- Frost protection activated.
haust air (only one With outside temperatures below -7 °C, correct
fan running) operation.
The frost protection sensor will not work at a dis-
charge air temperature above 3 °C.
Odours from the Outlets for fresh air and exhaust air are too close
kitchen/WC enter into to each other.
other rooms
Sound transmitted be- No crosstalk absorbers mounted.
tween the rooms
Planned air flow not System is not air-tight.
reached at the start-
up
Noise in the unit after Wrong mounting of the fans.
replacing the fan.
Table 7.1 Troubleshooting
Installation Manual recoVAIR/3 0020062918_03
• Troubleshooting is successful if the unit operates cor-
rectly.
• Only use genuine spare parts for repairs.
Remedy
After a mains failure the unit automatically restarts once the
mains voltage is re-established. Re-set circuit breaker in
mains distribution board. Check that all cables are properly
connected and undamaged. If necessary, replace the fuse F1
on the PCB.
Mount additional silencers in accordance with the system de-
sign.
Reduce the air quantity to the minimum fan stage. Clean or
replace filters.
Replace or clean ventilators, check the reason of soiling.
Clean the filter.
Open the fresh air valves/grilles. Adjust the system again.
Clean the exhaust air and fresh air ducts.
Fit a larger louvre.
Check the wiring.
Replace the fan if necessary.
Clean the filter.
Open the exhaust air valves. Adjust the system again.
Clean the exhaust air and fresh air ducts.
Fit a larger louvre.
Check the wiring.
Replace the fan if necessary.
In the programming level of the remote control, set or acti-
vate the bypass function.
Correctly position the temperature sensor.
Check the flap position and the motor and, if required, re-
place them.
Check that the plug to the flap motor is correctly positioned.
Check in the Service/Diagnostics menu whether the sensors
are detected at the remote control. See section 5.1.2
Connect the drain in accordance with section 4.5.3.
Insulate exhaust air and fresh air ducts, make ducts air-tight
or use specially insulated pipes.
Adjust the unit in accordance with section 5.2.
Check the flap and motor,
Clean the flap and bracket,
if necessary, replace the bypass.
Check the resistance of the frost protection sensor based on
table 7.3.
If necessary, replace the frost protection sensor.
Extend the distance between the outlets for fresh air and ex-
haust air. We recommend to position these junctions in differ-
ent parts of the roof.
Additionally install crosstalk absorbers.
Adjust the unit in accordance with section 5.2.
Seal all pipe connections properly if necessary.
Check the correct positioning of the fans.

Troubleshooting 7

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