EQJW146F002 EN
119
Operational faults
− Outdoor sensor AF1: When the outdoor sensor fails, the controller uses a flow tempera-
ture set point of 50 °C or the 'Max. flow temperature' when the max. flow temperature
(PA1, 2 > P07) is lower than 50 °C. With the setting CO1, 2 > F05 - 1 (underfloor heat-
ing), the flow temperature set point is 30 °C in the event of a malfunction.
− Flow sensor(s) in heating circuit(s): When the flow sensors in the heating circuits are de-
fective, the associated valve moves to 30 % travel. DHW heating using such a sensor to
measure the charging temperature is suspended.
− Flow sensors in the DHW circuit with control valve: When the flow sensor VF4 fails, the
controller behaves as if VF4 has not been configured. As soon as the control of the
charging temperature becomes impossible (VF2 defective), the associated valve is closed.
− Return flow sensors RüF1/2: When the return flow sensor fails, the controller continues
operation without return flow temperature limitation.
− Room sensors RF1/2: When the room sensor fails, the controller uses the settings for op-
eration without room sensor. The controller, for example switches from optimizing mode
to reduced operation. The adaptation mode is canceled. The last determined heating
characteristic remains unchanged.
− Storage tank sensors SF1/2: When one of the two sensors fails, the storage tank is no
longer charged (exception: solar system).
− Solar circuit sensors SF3, VF3: When one of the two sensors fails, the storage tank in the
solar circuit is no longer charged.
9.3 Temperature monitoring
When a system deviation greater than 10 °C persists in a control circuit for 30 minutes, an
"Err 6" message (temperature monitoring alarm) is generated.
Functions
WE
Configuration
Monitoring
0
CO5 > F19 - 1
9.4 Error status register
The error status register is used to indicate controller or system errors. The error messages
which cause a change in the state of the configured fault alarm output (CO5 > F07 - 1) are
highlighted in the following table (bold).
