The codes on the display indicate two types of fault: temporary and
permanent. The first item shown on the display is a letter followed by a
two-digit number. The letter indicates the type of fault: temporary (H) or
permanent (E). The number indicates the group in which the fault that has
occurred is classified according to its impact on safe and reliable
operation. The second item shown flashes alternately with the first and
consists of a two-digit number that indicates the type of fault which has
occurred (see the following fault tables).
TEMPORARY FAULT (A/H.x.x.)
A temporary fault is shown on the display by the letter “A” or “H” followed
by a number (group). A temporary fault is a type of fault that does not
cause a permanent stoppage of the boiler. It has the following
characteristics:
A: The appliance continues to operate. It disappears as soon as the cause
has been resolved.
H: Disappears when the error condition is removed, in some cases even
after 10 minutes.
PERMANENT FAULT (E.x.x)
A permanent fault is shown on the display by the letter "E" followed by a
number (group). Press the RESET button for one second. If faults are
shown frequently, contact our authorised technical assistance centre.
E: Stoppage, reset required..
11.2 Error codes
Tab.33 List of temporary (volatile) faults
BOILER DISPLAY
DESCRIPTION OF TEMPORARY FAULTS
CAUSE
Check / Solution
Group
code
Specific code
A.00 .34
Outdoor temperature sensor expected but not de
tected
OUTDOOR SENSOR NOT DETECTED
Connect the outdoor sensor
Outdoor sensor is not connected correctly
A.02 .06 Low water pressure
A.02 .18 OBD error
CONFIGURATION ERROR
Re-enter the CN1 and CN2 values, check the infor
mation shown on the data plate
A.02 .36 Functional device disconnected
SCB BOARD NOT DETECTED
Check the connection and the connectors
Faulty SCB, replace the board
A.02 .37 Passive functional device disconnected
SCB BOARD NOT DETECTED
Check the connection and the connectors
Faulty SCB, replace the board
A.02 .45 Connection error
SCB BOARD NOT DETECTED
Carry out the auto-detect function
A.02 .46 Device priority error
SCB BOARD NOT DETECTED
Carry out the auto-detect function
A.02 .48 Unit function configuration error
SCB BOARD NOT DETECTED
Carry out the auto-detect function
A.02 .49 Failed node initialisation
SCB BOARD NOT DETECTED
Carry out the auto-detect function
A.02 .54 Open Therm bus power supply error Replace the CU-GH board
A.02 .55 Incorrect or missing serial number Replace the CU-GH board
11 Troubleshooting
11.1 Temporary and permanent faults
11 Troubleshooting
72 600 Combi 2
Check the system pressure and restore it Check the
pressure of the expansion vessel Check for any sys
tem / boiler leaks
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