Unical ALKON 70 kW Instruction Manual download pdf (Page 57)

Fault finding

Code:

Description: Air in the pump (only for pump with

Sensor Logic

Corrective action: Manually bleed the air from

the circuit

Codice:

Description:

Jammed pump (only for pump with

SensorLogic)

Corrective action:

After removal of the central plug of the pump

body turn with a screw driver the pump rotor

and replace the plug.

Code:

Description:

Failure on the pump wiring (only for pump with

SensorLogic)

Corrective action:

Verify the wiring

Codice:

Description:

Insufficient water circulation

Corrective action:

Verify the installation

which could occur during boiler operation or commissioning

of the boiler.

When the fault signalling led (1) is on, press the LIGHT BLUE

key (2) to check the error code on the display (3).

Description: Failure of the heating return sensor

(SRR)

Corrective action: Check the efficiency of the

sensor and/or wiring

Description: Over high temperature detected by

the heating sensor (SR) (>95°C)

Corrective action: Check the system’s water

circulation

Description: Loss of flame signal during boiler

operation

Corrective action: Press the reset key on the panel

FAULT FINDING

5.1 - ERROR CODES

The boiler is fitted with an integrated diagnostic readout which,

in case of malfunction, consents the immediate individuation

of the type of fault directly on the control panel display

In the following fault finding table our purpose is to give some

technical information regarding the solutions to any problems

Code:

Description: DHW sensor failure (only if the boiler

is combined with an external storage tank)

Corrective action: Check the sensor’s efficiency

and/or its wiring

Code:

Description: Mains voltage < 190 Vac

Corrective action: Check that the mains voltage

is <190 Vac, if the mains voltage is correct replace

the control board.

Code:

Description: Insufficient gas pressure

Corrective action: Check the pressure; if the

pressure is correct check the efficiency of the gas

pressure switch and/or the wiring.

Code:

Description: Difference between the heating

temperature sensor (SR) and the heating return

sensor (SRR) > 35°C.

Corrective action: Check the installation

Code:

Description: No flame detected during the ignition

phase.

Corrective action: Press the reset key on the

control panel

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Unical ALKON 70 kW Instruction Manual Page 57

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