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R
e
F1
p
u m p
Reason:
Maximum return temperature exceeds limit value.
Cause:
An external heat source (CHP, heat pump etc.) has heated the return temperature above the maximum return temperature.
Corrective Action:
Reduce pre heat temperature of external heat source.
Cause:
The external heating controls suddenly close causing excessive return water temperature.
Corrective Action:
Dampen the reaction time of the external heating control system to prevent sudden boiler temperature rise.
Display message
L
a
F2
p
u m p
Reason
No temperature rise measured during firing.
Cause:
When the boiler starts firing, the control expects to measure a difference in temperature between inlet and outlet. If no
temperature rise is detected, the burner control assumes that there is no medium (water) present, to transfer heat from
combustion to the sensor and locks out to prevent damage.
Corrective Action:
Ensure that the system if full of water and all air-locks are removed.
Display message
R
e
F3
p
u m p
Reason
Return sensor is not detected
Cause:
Faulty wiring or connection in the return sensor circuit.
Corrective Action:
Check for loose or damaged wiring and or connections in the return sensor circuit and repair as necessary.
Cause:
Defective temperature sensor causing a fault signal.
Corrective Action:
Replace the return sensor.
Display message
F
l
F6
p
u m p
Reason
Flue sensor is not detected
Cause:
Faulty wiring or connection in the flue sensor circuit.
Corrective Action:
Check for loose or damaged wiring and or connections in the flue sensor circuit and repair as necessary.
Cause:
Defective temperature sensor causing a fault signal.
Corrective Action:
Replace the flue sensor.
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