Lochinvar EcoForce EF80 Installation, Commissioning, User And Maintenance Instructions page 109

Display message
Reason
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.
Display message
Reason
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
Reason:
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
Reason:
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.
C a s c a d e
Connection failure with one of the water heaters of the cascade.
G e n B l o c
General blocking circuit is activated during operation (general blocking contacts 7-
8).
W A T R H T R
> > > : 6 0
T3 external tank sensor is not connected to the terminals.
F l o w h i
Setpoint return (tank) temperature DHW (S3) is higher than
Setpoint heating = flow temperature (S1)
B l o c k
9 9 9
k
9 9 9
: T 3 E x t
. 0 ° C ( - 3
g h D H W
9 9 9
, 5 h r s
, 5 h r s
e r n a l
0 . 7 ° C )
, 5 h r s
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