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8
What to do if ... ?
8.1 Error and service messages on the display
If an error message is displayed, note down message
and contact customer service.
Unit, which caused the error message with the
relevant unit address
Cause of error
Display: Error
Press Info key. Error message disappears. The default
display is shown. The “Bell” symbol flashes until the error
has been rectified.
Display: Service
Boiler service required!
The service cycle set has expired.
Contact customer service.
Reset display to Info mode see Ch. 6.13
Note: Plant operation is not affected by
the service message.
Error 1:CPU
1# Boilersensor
Possible error message:
Display
External sensor
(all units)
Boiler sensor
(only on address
0, 1, 2*)
Boiler temp
Flow sensor
(for cascade flow
sensor, mixing valve
sensor)
Cause
➩ No external sensor connected to
plug slot No. 6
➩ No external sensor value on the
Bus
➩ Sensor short circuit or open circuit
after sensor recognition
➩ No boiler sensor connected to
plug slot No. 7
➩ Boiler sensor short circuit or
open circuit
➩ The boiler temperature (switch on
Min HE, parameter 190 ➩ 45°C)
is not achieved within one hour
➩ Burner rating too low, heating
circuit via gravity principle
➩ Burner control circuit open (T1/T2)
➩ Sensor short circuit or open circuit
after sensor recognition
Rectification
➩ Connect external sensor, if necessary set
parameter 141 Service level to “On”.
➩ Connect external sensor to WRS-EM, apply
voltage to CPU as external sensor is connected
to the CPU.
➩ Call up external temperature value in Info level. If
the value 0.0° C is displayed, the controller uses
this 0.0° C as external sensor value and carries
out all functions (frost protection, supply
temperature etc.) to this value, until the sensor is
replaced.
➩ Connect boiler sensor
➩ Call up the boiler temperature in the Info level.
If “❏ ❏ ❏“ is displayed, the sensor has a short
circuit. If the display shows “- - -”, the sensor is
open circuit. The heating circuits continue to
operate (frost protection function). If the heating
circuit is in economy mode, this is carried out.
Replace sensor, check contacts.
➩ The burner release contact (T1/T2) remains open
despite demand from the CPU.
➩ Switch on the gravity circulation via valve.
➩ Auxiliary air system defective, replace.
➩ Call up flow temperature in the Info level. If
“❏ ❏ ❏“ is displayed, the sensor has a short
circuit. If the display shows “- - -”, the sensor is
open circuit. The heating circuit pump is switched
off, the mixing valve runs “Open”. replace sensor,
check contacts.
Service 1:CPU
1# Boiler
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