Fault Finding - Grundfos RMQ A Serie Montage- Und Betriebsanleitung

11. Fault finding

DANGER
Electric shock
Death or serious personal injury
- Before starting work on the unit, make
sure that the RMQ unit is set to "Only".
Then disconnect the power supply.
Make sure that the power supply cannot
be accidentally switched on.
Fault
1. Acoustic fault
indication and the
indicator lights
"Emergency
overflow" and "Only"
are flashing.
2. Acoustic fault
indication and the
indicator lights "10
%" and "Only" are
flashing.
3. Acoustic fault
indication and the
indicator lights "20
%" and "Only" are
flashing.
4. The indicator lights
"Alarm" and "Auto"
are permanently on.
5. The indicator lights
"Alarm" and "Only"
are permanently on.
6. Acoustic fault
indication and the
indicator lights
"Backflow" and
"Only" are flashing.
16
Cause
a) The float valve leaks due to
impurities.
b) The float valve cannot move
freely in the mains-water tank.
a) One of the two leads between
the unit and the level sensor in
the collecting tank is defective
(cable breakage) or has not
been connected correctly to
the terminal block of the unit.
a) The sensor cable has short-
circuited.
b) Water has penetrated into the
level sensor.
a) The pump has run dry of
rainwater.
a) The float valve is blocked due
to impurities.
b) The float valve cannot move
freely in the mains-water tank.
a) Only possible if backflow
monitoring equipment
(accessory) has been
installed: Backflow from the
sewage system to the
collecting tank, such as an
underground tank.
CAUTION
Biological hazard
Minor or moderate personal injury
- Only use potable water or rainwater.
Remedy
Check that the filter on the inlet side of the
float valve has been fitted correctly. Clean
the filter. See section 8.4 Connection of
mains-water pipe.
Turn on a point of consumption, such as a
toilet or tap, and allow the pump to run for
approximately 1 minute, thus attempting to
wash down the impurities from the valve.
Then set the unit to the desired operating
mode.
Make sure that the float valve can move
freely up and down in the tank.
Check the level sensor, cable and terminal
block. Connect the leads again, or replace
the sensor.
Check whether the two stripped wires touch
each other.
Replace the level sensor and the sensor
cable.
Check the water level in the collecting tank
and the installation of the level sensor. The
inlet filter must as a minimum reach a water
depth corresponding to 30 cm water above
the level sensor.
Check that the filter on the inlet side of the
float valve has been fitted correctly.
Clean the filter. See section
of mains-water pipe.
Turn on a point of consumption, such as a
toilet or tap, and allow the pump to run for
approximately 1 minute, thus attempting to
wash down the impurities from the valve.
Then set the unit to the desired operating
mode.
Make sure that the float valve can move
freely up and down in the tank.
Pump out the sewage water and clean the
tank.
Examine the cause of the backflow. If the
backflow has been caused by blockages in
the sewage system, they must be removed
before the system can be restarted.
8.4 Connection