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11 Troubleshooting
BOILER DISPLAY
Group
Specific code
code
A.02
.76
H.00
.42
H.01
.00
H.01
.05
H.01
.08
H.01
.14
H.01
.18
H.01
.21
H.02
.00
H.02
.02
H.02
.03
H.02
.04
H.02
.05
H.02
.07
DESCRIPTION OF TEMPORARY FAULTS
Internal memory reserved for full customisation of
settings. No further changes can be made
Pressure sensor open/faulty
Temporary communication failure between gas
valve and boiler PCB.
Maximum temperature difference value between
flow and return reached.
Flow temperature increase in heating mode too
quick. Temporary stoppage of 10 minutes.
Maximum flow temperature value reached.
No water circulation (temporary).
Flow temperature increase in domestic water
mode too quick. Temporary stoppage of 10 mi
nutes.
Reset in progress
Waiting for configuration settings to be entered
(CN1,CN2).
Configuration settings (CN1,CN2) not entered
correctly.
PCB settings cannot be read.
Setting memory not compatible with the boiler
PCB type
Low pressure in heating circuit (permanently)
CAUSE
Check / Solution
CONFIGURATION ERROR
Re-enter the values CN1 and CN2
Replace the CU-GH board
RESET PROCEDURE IN PROGRESS
No action required
MAIN PCB ERROR
Configure CN1/CN2
Replace the main PCB
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
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
INSUFFICIENT CIRCULATION
Check the boiler/installation circulation
Activate a manual venting cycle
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
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
CN1/CN2 CONFIGURATION MISSING
Configure CN1/CN2
Check configuration CN1/CN2 Configure CN1/CN2
correctly
MAIN PCB ERROR
Configure CN1/CN2
Replace the main PCB
-
Check the system pressure and restore it Check the
pressure of the expansion vessel Check for any sys
tem / boiler leaks
800 System 2
71
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