▶
In the event of back flow, set the emergency lock to the
"
ZU (OFF)
"
position.
▶
Repair or have faults repaired in accordance with this table:
NOTICE!
If the control does not automatically switch back
to [Normal operation] after attempted troubleshooting, seek
help from a trade professional.
The display shows
Possible cause
Troubleshooting by
Troubleshooting meas‐
ures
[Battery operation ]
[NRV opened]
Power failure, circuit
breaker has activated
Operators
The power supply is
automatically taken
over by the battery
(approx. 24 hours) until
the mains voltage is
restored.
Safety against back
flow is guaranteed.
n
Check mains cable
connection
n
Check mains circuit
breakers
[Battery error / Insert
battery]
Rechargeable battery is
missing or rechargeable
battery fuse or cabling
is defective
Trade professionals
n
Check rechargeable
battery / Recharge‐
able battery fuse
n
Check cabling
[Battery error / Replace
battery]
Rechargeable battery
faulty
Operators
No safeguarding
against back flow in
case of power outage.
Replace rechargeable
battery
[Error motor fault]
[NRV opened]
This error is displayed if
a back flow is recog‐
nised in normal opera‐
tion and the motor-
powered flap cannot be
closed due to an motor
defect or foreign body
blocking it.
n
Motor defective
n
Motor spindle
broken
n
Motor-powered flap
blocked
Operators
Note: In case of back
flow, there is a risk of
flooding - Set the emer‐
gency lock to
"
ZU
"
(OFF) position.
Trigger the self-test
with T3 button:
n
If the motor doesn’t
begin immediately,
check the cable con‐
nections in the con‐
trol unit. If the error
message remains,
replace cover (model
4987.418)
1)
.
[Back pressure]
[Close emergency lock]
1)
The components integrated into the cover cannot be replaced individually.
Handling
Grundfix Plus Control backflow trap type 3
32