E.C.A. Confeo Premix CP 24 HST Installation And User's Operating Instructions page 46

FAULT/ERROR FINDING
Several checks are included to protect the boiler and its environment. In case of error condition, the
error code is flashed on the LCD display (Table 7), Burner LED shows failure indication (it turns
RED) and heat demands will be disabled.

Error conditions can be divided in 2 groups: lockout conditions and blocking conditions.
a) Lockout conditions, Lockout flue gas overtemperature, Lockout boiler overtemperature, No
flame signal, Flame loss, Flame simulation, Failure flow-return supervision, Failure gas valve
circuit V1/V2, and Failure fan speed can only be cleared by pressing the reset push-button, then
display panel will be in stand-by mode. If the problem continues, call qualified service. While in
lockout conditions, Burner LED will turn RED.
b) Blocking conditions, Boiler overtemperature, Failure CH flow sensor (NTC), Failure flue gas
sensor (NTC), Failure DHW tank sensor (NTC), Failure CH return sensor (NTC), Failure power
supply, and Failure water pressure, will reset as soon as the cause of the problem disappears. For
example, when CH water pressure is out of operating range, blocking condition will be generated
and keep the system off until the pressure is within operating range again.
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