Lochinvar EcoForce EF80 Installation, Commissioning, User And Maintenance Instructions page 104

Display message
F15
Reason:
Cause:
The thermal fuse of the heat exchanger has opened permanently.
Corrective action:
Switch off the electrical power and gas supply and contact supplier.
Display message
F16
Reason:
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 increase the resistance
causing the water flow to drop.
For F16 see also Flow Monitoring
Display message
F17
Reason:
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 the flow through the unit.
Check if the system resistance exceeds the spare capacity of the unit pump.
C l i x o n
p u m p o n
Heat exchanger fuse exceeded maximum value.
F l o w R e t
p u m p o n
Temperature difference between flow and return exceeds limitation value, or
'Heatexchang at Risk' has occurred 3 times.
W a t e r h
p u m p o n
Maximum thermostat exceeds limitation value.
F a u l t
9 9 9
u r n d t
9 9 9
i g h l i m i
9 9 9
, 5 h r s
f a u l t
, 5 h r s
t
, 5 h r s
104