Glow-worm Clearly Heat Recovery - Manual (Page 24)

24
7 Fault Finding
Fault Cause Remedy
The unit does not
operate
Temporary interruption of the mains voltage supply
or no supply at all. Power supply circuit breaker
tripped. Electricity disconnector was activated.
Fuse F4 in the unit is defective.
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 F4
on the PCB.
Unit operation is very
loud even at the
minimum fan speed
No silencers in the fresh air and exhaust air ducts.
Wrong silencers, or silencers are too short. Filters
are extremely soiled.
Ventilators are defective or heavily soiled.
Mount additional silencers in accordance with the system
design.
Reduce the air quantity to the minimum fan stage. Clean or
replace filters.
Replace or clean ventilators, check the reason of soiling.
None or insufficient
fresh air supply
Filters are extremely soiled.
Fresh air valves/grilles closed too much.
Exhaust air or fresh air ducts obstructed.
Fresh air input louvre too small.
Incorrect wiring.
Fan defective.
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.
No or insufficient
exhaust air flow
(i.e. in the bathroom
the mirror stays
fogged up)
Filters are extremely soiled.
Exhaust air valves closed too much.
Exhaust air or fresh air ducts obstructed.
Fresh air input louvre too small.
Incorrect wiring.
Fan defective.
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.
Bypass summer mode
does not work
Bypass function not activated or set days for
summer mode expired.
Incorrect positioning of the temperature sensor.
Flap position and/or motor for bypass defective.
Defective bypass motor wiring.
In the programming level of the remote control, set or activate
the bypass function.
Correctly position the temperature sensor.
Check the flap position and the motor and, if required, replace
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 6
Noise in the
condensation water
drain trap
Drain trap incorrectly connected. Connect the drain in accordance with section 4.3.
Water dripping from
the unit
Exhaust air and fresh air ducts are not vapour-
sealed.
Insulate exhaust air and fresh air ducts, make ducts air-tight or
use specially insulated pipes.
Fresh air too cold Exhaust air and fresh air flows not balanced.
Wrong flap position and bypass motor defective.
Adjust the unit in accordance with section 5.8.
Check the flap and motor,
Clean the flap and bracket,
if necessary, replace the bypass.
No fresh air or
exhaust air (only one
fan running)
Frost protection activated.
With outside temperatures below -7 °C, correct
operation.
The frost protection sensor will not work at a
discharge air temperature above 3 °C.
Check the resistance of the frost protection sensor based on
table, “Resistance Values of the Temperature Sensor“.
If necessary, replace the frost protection sensor.
Odours from the
kitchen/WC enter into
other rooms
Outlets for fresh air and exhaust air are too close
to each other.
Extend the distance between the outlets for fresh air and
exhaust air. We recommend to position these junctions in
different parts of the roof.
Sound transmitted
between the rooms
No crosstalk absorbers mounted. Additionally install crosstalk absorbers.
Adjust the unit in accordance with section 5.8.
Planned air flow not
reached at the start-up
System is not air-tight. Seal all pipe connections properly if necessary.
Noise in the unit after
replacing the fan.
Wrong mounting of the fans. Check the correct positioning of the fans.
7.1 Fault Finding
The faults listed below may only be rectified by a competent
person approved at the time by the Health and Safety
Executive.
The following checks should be performed before proceeding
onto specific diagnostics:
•
Check the external electrical supply to the boiler is on and
a supply of 230V is present at the ‘L’ and ‘N’ terminals on
the installer interface, refer to section 11.4 for access and
diagram 14.4.
•
Check the electrical installation and unit, carry out tests for
earth continuity, polarity, short circuit and resistance to earth,
using a suitable multimeter.
•
Check that all external controls are on.
•
Check the functional flow diagram, 14.5.