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Code Description Checking / solution
Su:10
Su:11
The BL inlet on the PCU PCB terminal
block is open
The contact connected to the BL inlet is open
4 Contact the professional who takes care of maintenance of the
appliance
Parameter error
4 Contact the professional who takes care of maintenance of the
appliance
Bad connection
4 Contact the professional who takes care of maintenance of the
appliance
Su:13 Communication error with the SCU
PCB
Bad connection
4 Contact the professional who takes care of maintenance of the
appliance
SCU PCB not installed in the boiler
4 Contact the professional who takes care of maintenance of the
appliance
Su:14 The water pressure is lower than 0,8
bar
Not enough water in the circuit
4 Top up the installation with water
Su:15 Gas pressure too low Incorrect setting of the gas pressure switch on the SCU PCB
4 Check that the gas valve is fully opened
4 Contact the professional who takes care of maintenance of the
appliance
Su:16 The SU PCB is not recognised Wrong SU PCB for this boiler
4 Contact the professional who takes care of maintenance of the
appliance
Su:17 The parameters saved on the PCU
PCB are impaired
Parameter error on the PCU PCB
4 Contact the professional who takes care of maintenance of the
appliance
Su:18 The PSU PCB is not recognised Wrong PSU PCB for this boiler
4 Contact the professional who takes care of maintenance of the
appliance
Su:19 The boiler has not been configured The PSU PCB has been changed
4 Contact the professional who takes care of maintenance of the
appliance
Su:21 Communication error between the
PCU and SU PCBs
Bad connection
4 Contact the professional who takes care of maintenance of the
appliance
Su:22 No flame during operation No ionization current
4 Check that the gas valve is fully opened
4 Contact the professional who takes care of maintenance of the
appliance
Su:25 Internal error on the SU PCB
4 Contact the professional who takes care of maintenance of the
appliance
Su:28 An HL tank is detected whilst the boiler
cannot control it.
This message disappears after 10
seconds if the boiler can control the
HL tank
4 Wait for 10 seconds to see whether the error persists
4 Contact the professional who takes care of maintenance of the
appliance
Su:29 Communication error between the
PCU and SCU-s191 PCBs
Bad connection
4 Contact the professional who takes care of maintenance of the
appliance
Su:30 Communication error between the
SCU-s191 PCBs and the solar control
system
Bad connection
4 Contact the professional who takes care of maintenance of the
appliance
EGC 25 7. Troubleshooting
28/05/2015 - 300026082-001-04
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