109
Display message
G e n B l o c k
9 9 9 , 5 h r s
Reason
General blocking circuit is activated during operation (general blocking contacts 7-
8).
Cause:
The circuit connected to the general blocking terminals is not closed.
Corrective action:
Check all external components that are connected to the general blocking terminals and check why the contact
is not closing during heat demand.
Cause: If used in combination with flow switch:
The water flow through the unit is too low.
Corrective action:
Check functioning of the pump and the flow switch.
Check/open all valves that might restrict the water flow through the unit.
Check for an external system pump that influences flow through the unit.
Check if the system resistance exceeds the spare capacity of the unit pump.
Make sure the heat exchanger is clean. Heat exchanger fouling (partly blockage) will increase the resistance
causing the water flow to drop.
Display message
W A T R H T R : T 3 E x t e r n a l
> > > : 6 0 . 0 ° C ( - 3 0 . 7 ° C )
Reason:
T3 external tank sensor is not connected to the terminals.
Cause:
The sensor is not connected to the terminal, or the wire is broken. The sensor is malfunctioning.
Corrective Action:
Connect the sensor to the terminals 3 and 4.
Check the wires from the sensor to the terminals.
Check the sensor on resistance 10K at 25°C.
Display message
F l o w h i g h D H W
9 9 9 , 5 h r s
Reason:
Setpoint return (tank) temperature DHW (S3) is higher than
Setpoint heating = flow temperature (S1)
Cause:
Wrong setting of parameter: P6BA Heating setpoint below P6CA DHW setpoint
Corrective Action:
Adjust the heating setpoint through the display: menu – settings – heating setpoint.
Display message
C a s c a d e B l o c k
9 9 9 , 5 h r s
Reason
Connection failure with one of the water heaters of the cascade.
Cause:
The unit is programmed in such a way that none of the water heaters in a cascade will fire, if one has a lockout.
One unit has a lockout and therefore the whole cascade is blocked.
Corrective action:
Troubleshoot the fault of the unit in lock-out.
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