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11 Troubleshooting
11.1 Error codes
Error messages are displayed according to the type of fault.
Temporary fault
A temporary fault is indicated by an ‘H’ followed by a two-digit code
number (e.g. .02). This code flashes and alternates with a second two-digit
code (e.g. .06) that indicates the specific fault.
A temporary fault prevents the boiler operating but will automatically reset
once the cause of the fault has been resolved.
See
Fault finding — temporary faults, page 65 for a list of temporary
faults and their possible solutions.
Permanent fault
A permanent fault ‘Lock out’ is indicated by an ‘E’ followed by a two-digit
code number (e.g. .02). This code flashes and alternates with a second
two-digit code (e.g. .07) which indicates the specific fault.
A permanent fault prevents the boiler operating and will not automatically
reset. Once the fault condition has been rectified the RESET button must
be pressed for 3 seconds to restart the boiler.
Warning
Pressing the RESET button for 5 seconds will start the de-aeration
process! The boiler will run in de-aeration for approximately 5
minutes before restarting.
See
Fault finding - permanent faults, page 66 for a list of permanent
faults and their possible solutions.
11.2 Fault finding — temporary faults
Tab.28 Temporary fault finding guide
Group
code
Specific
code
Description
Probable cause
Check/Reason
H:01
.00
Communication error between
gas valve and PCB
Fault in air/gas unit
Loose connection to gas valve
Replace air gas unit
Check gas valve connection
from PCB
H:01
.05
Maximum difference between
the flow and return temperature
exceeded
Non-existent or insufficient circu
lation
Sensor error
Check circulation/pump
Check water pressure
Check sensors are operating
correctly
Check that the sensor has been
correctly fitted
Check the cleanliness of the
heat exchanger
H:01
.08
CH Flow temperature increasing
too fast
Non-existent or insufficient circu
lation
Sensor error
Check circulation
Check water pressure
Check sensors are operating
correctly
Check that the sensor has been
correctly fitted
Check the cleanliness of the
heat exchanger
H:01
.14
Maximum flow temperature ex
ceeded
Non-existent or insufficient circu
lation
Check circulation.
11 Troubleshooting
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