E93.1001EN.C Manual CD
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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
F0
F l o w
s e n s o r
e r r o r
p u m p
o n
9 9 9 , 5
h r s
Reason:
Flow sensor is not detected.
Cause:
Bad wiring/connection in the flow sensor circuit.
Corrective action:
Check for loose wiring/connections in the flow sensor circuit.
Cause:
Bad temperature sensor causing a fault signal.
Corrective action:
Replace flow sensor.
Display message
F16
F l o w R e t u r n d t
f a u l
t
p u m p o n
9 9 9 , 5 h r s
Reason:
Temperature difference between flow and return exceeds limita-
tion value, or 'dT block or delta direct block' has occurred three
times.
Cause:
The water flow through the unit is too low.
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 the 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 in-
crease the resistance causing the water flow to drop.
Display message
F6
F l u e
s e n s o r
e r r o r
p u m p
o n
9 9 9 , 5
h r s
Reason
Flue sensor is not detected by the water heater PCB.
Cause:
Bad wiring/connection in the flue gas sensor circuit.
Corrective action:
Check for loose wiring/connections in the flue gas sensor circuit.
Cause:
Bad temperature sensor causing a fault signal.
Corrective action:
Replace flue gas sensor.
