117
Display message
F1
F l o w
h i g h
T e m p
p u m p
o n
9 9 9 , 5
h r s
Reason:
Max. flow temperature exceeds limitation (lock-out) value.
Cause:
The water flow is restricted.
Corrective action:
Check functioning of the pump.
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.
Display message
L i n e
f a u l t
p u m p
o n
9 9 9 , 5
h r s
Reason
Bad power supply
Cause:
The supplied power does not comply with the specifications.
Corrective action:
Check if the power supply is connected correctly to the unit.
Check the voltage and frequency. (Should be Life Neutral, Gnd > 230Vac/50Hz).
Make sure there is no signal failing or voltage peaks in the power supply.
Display message
N R V
o r
F a n
f a u l
t
9 9 9 , 5
h r s
Reason
Non-return valve still open.
Cause:
It is not proven that the non-return valve of the burner, that is not burning, is closed.
Corrective action:
When a closed non return valve is proven this message will disappear.
If not a lockout message will appear.
Cause:
It is not proven that the non-return valve of the burner, that is not burning, is closed, but
the fan is running to prevent recirculation. (If P2MT =1)
Corrective action:
Check the state of the Non-Return Valve:
> Is the valve moving freely to the open and closed position.
> Is there debris/fouling or corrosion in the valve to prevent the valve to move freely.
Cause:
The fan of the non-burning burner is not able to run to prevent recirculation, but the non-
return valve is closed to prevent recirculation. (If P2MT =1)
Corrective action:
Check the 4-wired wiring and connections at the fan and at the main control board.
Check the 3-wired power supply wiring and connections at both ends.
Replace the fan.
Replace the main control board of that specific burner.
Cause:
It is not proven that the non-return valve of the unit is closed.
Corrective action:
Check and repair or replace NRV.
