
35
SECTION 4 - FAULT FINDING
4.2 SERVICE MODE
THE DISPLAY
The user control has two LEDs and two 7 segment displays to inform the user about the status. The display will show the status
of the boiler. The LED will show the status of the flame. If no flame is detected the LED is off. When the flame is detected the
LED will be lit permanently.
Below is a list with display function in normal operation.
Standby, no demand for heat present.
CH
Boiler is active for central heating.
H
Boiler is active for domestic hot water.
F
CH circuit water less than 5ºC.
Below is a list with display in fault condition. If the display is showing “L” or “F” with a number / letter refer to page 34.
L
Boiler is in lockout for a specific error. Display will show “L” with a number or letter to show which error is detected.
F
Boiler has a fault for a specific error. Display will show “F” with a number or letter to show which error is detected.
Service Modes
SH
Service High
SL
Service Low
*Setting to Minimum Rate:
1.
Hold “restart” & “function” buttons together for more than 5s
2. Last 3 faults will be shown
3.
SH shown, press “function” button.
4.
SL shown, press “restart”
5. Burner will run for 10 minutes at minimum rate.
6.
Press “restart” to exit Minimum Rate mode.
Setting to Maximum Rate (DHW max. gas rate, operating in CH mode):
1.
Hold “restart” & “function” buttons together for more than 5s
2. Last 3 faults will be shown
3.
SH shown, press “restart”
4. Burner will run for 10 minutes at maximum rate.
5.
Press “restart” to exit Maximum Rate mode.