Wilo Wilo-RainSystem AF Comfort Series - Fault Diagnosis and Resolution; Understanding Fault Signals

English
Installation and operating instructions RainSystem AF Comfort 31
12 Faults, causes and remedies
12.1 Fault signals
If there is a fault, the display screen on the switch-
gear will alternate between the default display and
the fault signal.
Menu Cause Fault remedy
4.01 pump dry run-
ning
The pump is not reaching the required minimum pressure.
• Dry-running detection is set too restrictively
• Suction lines are leaking
• Air in the unit
Reduce the minimum pressure for dry-
running time in menu 2.46 or increase
the time for dry-running detection in
menu 2.15.
CAUTION! Danger of damage to the
unit! When remedying the fault, at
least one tap or extraction point must
be open for the purpose of evacuation.
If the fault occurs again, check the suc-
tion lines for leaks, replace if necessary
and vent the system.
4.02 switching fre-
quency
The pump is switching off and on too often.
• Pressure-related fault in the system (e.g. pipe breakage,
leak)
Get Wilo after-sales service to remedy
the cause of the fault.
4.03 back pressure
at overflow
The sensor connected at input E4 is reporting back pressure.
The fault signal occurs only if the sensor has been configured
in menu 2.24 as a back pressure protection device.
• Wastewater is coming in through the overflow
• The overflow is blocked
Remedy the cause of the back pressure
at the overflow.
4.04 error at
water lev.sensor
The level sensor is faulty. Check the level sensor and replace if
needed. The unit will operate with pota-
ble water until the fault is remedied.
4.05 error at
pressure sensor
The pressure sensor is faulty. Check the pressure sensor and replace if
needed.
4.06 error
alarm level
The water level in the collector tank is too high and is above
the overflow.
• Overflow height set incorrectly
• The overflow is blocked
• Water is entering the collector tank through the overflow
(flooding)
• Check the height of the overflow set in
menu 2.07 and correct it if needed
• Check the overflow and remove any
blockage
• Prevent water from entering through
the overflow
4.07 error
max. time pump
The set time limit for continuous running of the pump has
been reached.
• Leakage in the pipe system
Fix the leak in the pipe system. If there is
no leakage, increase the maximum per-
missible continuous running time for the
pump in menu 2.21 or switch it off with
the value 000 min.
4.08 error
overflow tank
The sensor connected at input E4 is reporting tank overflow.
The fault signal occurs only if the sensor has been configured
in menu 2.24 as an overflow protection device.
• Wastewater is coming in through the overflow
• The overflow is blocked
Remedy the cause of the overflow at the
overflow.