Strebel S-CB Px 120, Installation Operating & Maintenance Manual

Page: 91 / 118

S-CB Px 120 Manual 91
Display message
F1
R e t u r n h i g h T e m p
p u m p o n 9 9 9 , 5 h r s
Reason Maximum return temperature exceeds limit value.
Cause:
Systems that pre-heats the boiler return temperature too much/high.
Corrective action:
Reduce pre heat temperature of external heat source.
Cause:
The need for heat in the system suddenly drops causing hot return water to the boiler.
Corrective action:
Dampen external heating system control to prevent sudden boiler temperature rise.
Display message
F2
L a c k o f w a t e r
p u m p o n 9 9 9 , 5 h r s
Reason No temperature rise measured during firing.
Cause:
When the unit starts firing it expects to measure a temperature rise. If this temperature
rise is not detected, there is suspicion that there is no medium (water) present, to
transfer heat from combustion to the sensor.
The lack of water can cause this fault when the unit is firing.
Corrective action:
Make sure there is water present in the unit before firing.
Display message
F3
R e t u r n 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 Return sensor is not detected by the boiler PCB.
Cause:
Bad wiring/connection in the return sensor circuit.
Corrective action:
Check for loose wiring/connections in the return sensor circuit.
Cause:
Bad temperature sensor causing a fault signal.
Corrective action:
Replace return sensor.
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 boiler 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.