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• By pressing reset switch for 10 sec. P01 appears on LCD. Since the
display has two digits P letter and corresponding number are visuali-
zed alternatively.
• By rotating DHW knob P1 value can be set.
• To save P1 selected value leave DHW knob in the selected position
and press RESET switch 5 sec.
5.1.4.2 Parameter Selection
• By pressing RESET switch for 1 touch it is possible to select parame
-
ters.
• By pressing RESET switch for more than 5 sec. the modification
menu can be accessed, then the actual value will be shown.
5.1.4.3 Parameter Modification
• By moving DHW knob, the desired value can be chosen.
• If RESET switch is pressed for a time greater than 5 sec. the modi
-
fication is memorized and the system returns to PARAMETER SE-
LECTION MODE with the following parameter already selected.
• By moving CH knob, it is possible to exit PARAMETER MODE.
• After 2 min. without performing anything through DHW knob, an au
-
tomatic exit is forced and boiler will go back to normal working condi-
tion.
5.2 OPERATING ERRORS
When a problem occurs with operation, the boiler exhibits this fault via
LCD display. The diagnosed fault encoding is shown in Table 7;
HARMONY_D USERS INSTALLATION AND SERVICE MANUAL
45
5.2 OPERATING ERRORS
When a problem occurs with operation, the boiler exhibits this fault via LCD display. The
diagnosed fault encoding is shown in Table 7;
Table 7 Fault Display
No flame after ignition sequence
F4 + Reset + monkey wrench
Spurious flame
F4
High limit thermostat
F1 + Reset +monkey wrench
Air pressure switch fault
F5 + Reset
Flow sensor fault
F3 + monkey wrench
DHW sensor fault
F2 + monkey wrench
H2O pressure switch cut-in
E0 + monkey wrench
These errors mentioned above, are listed according to their priority orders.
In the case boiler goes through non-volatile lockout, user should switch reset button after
literally solving the main cause of the problem.
If ‘no
-
flame fault’ arises, be sure that gas valves are open and gas flow exists. During
the first start-up the boiler may lockout since the gas line may contain air. This is quite
normal. Reset the boiler 2
–
3 times, waiting 20 seconds between the attempts. If the
boiler goes to lockout state continuously consult your authorized service. This error
occurs after three ignition attempts for natural gas and one ignition attempt for LPG.
Spurious flame check will be performed before ignition attempts, so that real flame
can be differentiated from the fake one.
If lockout is caused by excessive temperature, wait for the system water to cool down
before another try. The flow pump control remains active depending on the type of
demand in progress to execute any specified pump overrun functions (45 seconds for
CH with room thermostat and 18 seconds for DHW demand). Several unsuccessful
trials may mean a service call is required. Consult your authorized service dealer.
If “H
2
O pressure switch cut-
in” fault arises, this means there is not enough water in
the circulation. In order to avoid this problem, the boiler should be filled with water as
it is explained in water filling part.
For any other fault or repeated lockout conditions, consult your authorized service
dealer.
5.2.1 Some Typical Problems
Boiler is running noisy!
Turn off the boiler. Release the air in the heating system. Fill water if necessary. Start the
boiler. If there is still noise, call the service.
There is continuous water loss!
Check if there is any leakage at the heating system. If not, call the service.
There is no or insufficient hot water flow through the taps!
Filter at the cold-water inlet of the boiler might be blocked, call the service.
Heating system temperature is rapidly increasing and the boiler is stopping!
There might be air in the system. Vent the system and re-start. If the problem repeats, call the
service.