Strebel S-WG 100, Installation, Operating And Maintenance Manual, Page: 109 / 125

E09.012.246 Manual S-WG
110
Display message
F15
C l i x o n F a u l t
p u m p o n 9 9 9 , 5 h r s
Reason: Heat exchanger fuse exceeded maximum value.
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
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 limi-
tation value, or 'Heatexchang at Risk' has occurred 3 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
increase the resistance causing the water flow to drop.
For F16 see also § 8.4
‘Flow monitoring’ on page 37.
Display message
F17
W a t e r h i g h l i m i t
p u m p o n 9 9 9 , 5 h r s
Reason:
Maximum thermostat exceeds limitation 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 the flow through the unit.
Check if the system resistance exceeds the spare capacity of the unit pump.