BOILER DISPLAY
DESCRIPTION OF TEMPORARY FAULTS
CAUSE
Check / Solution
Group
code
Specific code
A.02 .76
Internal memory reserved for full customisation of
settings. No further changes can be made
CONFIGURATION ERROR
Re-enter the values CN1 and CN2
Replace the CU-GH board
H.00 .42 Pressure sensor open/faulty
RESET PROCEDURE IN PROGRESS
No action required
H.01 .00
Temporary communication failure between gas
valve and boiler PCB.
MAIN PCB ERROR
Configure CN1/CN2
Replace the main PCB
H.01 .05
Maximum temperature difference value between
flow and return reached.
INSUFFICIENT CIRCULATION
Check the boiler/installation circulation
Activate a manual venting cycle
Check the installation pressure
OTHER CAUSES
Check the cleanliness of the exchanger
Check the operation of the temperature sensors
Check the connection of the temperature sensors
H.01 .08
Flow temperature increase in heating mode too
quick. Temporary stoppage of 10 minutes.
INSUFFICIENT CIRCULATION
Check the boiler/installation circulation
Activate a manual venting cycle
Check the installation pressure
OTHER CAUSES
Check the cleanliness of the exchanger
Check the operation of the temperature sensors
Check the temperature sensor connection
H.01 .14 Maximum flow temperature value reached.
INSUFFICIENT CIRCULATION
Check the boiler/installation circulation
Activate a manual venting cycle
H.01 .18 No water circulation (temporary).
INSUFFICIENT CIRCULATION
Check the installation pressure
Activate a manual venting cycle
Check the operation of the pump
Check the boiler/installation circulation
TEMPERATURE SENSOR ERROR
Check the operation of the temperature sensors
Check the temperature sensor connection
H.01 .21
Flow temperature increase in domestic water
mode too quick. Temporary stoppage of 10 mi
nutes.
INSUFFICIENT CIRCULATION
Check the installation pressure
Activate a manual venting cycle
Check the operation of the pump
Check the boiler/installation circulation
TEMPERATURE SENSOR ERROR
Check the operation of the temperature sensors
Check the connection of the temperature sensors
H.02 .00 Reset in progress
H.02 .02
Waiting for configuration settings to be entered
(CN1,CN2).
CN1/CN2 CONFIGURATION MISSING
Configure CN1/CN2
H.02 .03
Configuration settings (CN1,CN2) not entered
correctly.
Check configuration CN1/CN2 Configure CN1/CN2
correctly
H.02 .04 PCB settings cannot be read.
MAIN PCB ERROR
Configure CN1/CN2
Replace the main PCB
H.02 .05
Setting memory not compatible with the boiler
PCB type
-
H.02 .07 Low pressure in heating circuit (permanently)
Check the system pressure and restore it Check the
pressure of the expansion vessel Check for any sys
tem / boiler leaks
11 Troubleshooting
600 Combi 2 73
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