PILOT MODE
Pilot mode
After you power down the appliance the screen displays Pilot mode, as shown in the figure above.
This is the standard MCBA mode. The MCBA automatically returns to this mode after 20 minutes if no keys have been pressed on the screen. Any parameters that were modified are then enabled.
The first character shows the current status of the boiler depending on the condition of both the boiler and the burner. The last 2 characters indicate the start temperature.
Status | Boiler function |
Pilot, no demand for heat | |
Fan first, fan after | |
Ignition |
|
Operation of the boiler burner for the heating | |
Operation of the boiler burner for the domestic hot | |
water |
|
Air pressure limit or obtaining the number of start | |
revolutions. | |
The burner goes out when the specified value is | |
reached. A demand for heat is present nonetheless. | |
Pump | |
hot water |
|
Pump | |
heating |
|
Burner blocked: | |
• | :T1 > 95°C |
• | :T2 > 95°C |
• | : T2 - T1 > 10.20 or 40°C after a time of xx |
• | : dT1/dt > maximum gradient T1 |
• | : water pressure switch not off |
• | : no fan signal |
• | : erroneous fan signal |
• | : T1 - T2 > max Delta |
• | : NTC3 |
• | : NTC3 interrupt |
• | : wait for the fan to start |
If the burner is blocked for one of the reasons mentioned above, the screen display alternates between a 9 followed by the temperature (two last digits) and b with the error code.
MCBA FOR SPECIALISTS: INSTALLER, SERVICE ENGINEER
Once the cause of the blockage has been resolved, the burner starts automatically within 150 seconds at most.
Status | Boiler function |
Internal check —
Boiler burner in hot water ready function
Test function: Central heating high power
Test function: Central heating low power
Test function: Boiler with fixed number of revolutions
15
