Operating Mode (X; Shut-Off Mode (Bxx) - REMEHA Quinta 45 Technical Information

6.3 Operating mode (x[[)

During operation the code-display shows the status (position in cycle) of the boiler,
whilst the t-display indicates the actual flow temperature.
The digits or letters in the code-display have the following meaning:
Code Description
0
Standby: there is no heat demand from control system.
1
Pre-purge: before start-up, the boiler is purged for 3 seconds.
Post-purge: when the heat demand has been met, the fan continues to
operate for another 10 seconds.
2
Ignition: ignition is activated for 2.4 seconds while the gas valve is opened.
3
HTG mode; the boiler operates in the HTG mode.
4
DHW mode: the three way valve or DHW pump activated (Broag priority only)
5
Internal check
6
Normal control stop during HTG (flow temperature > set point + 5 °C)
7
HTG pump run on
8
DHW pump run on or for three way valve option, HTG pump run on with valve
open to DHW (max. 5 minutes)
9
- Normal control stop during DHW (flow temperature > set point DHW +
DHW control stop set point + 5°C)
b
Shut-off mode
h
Forced full load.
l
Forced part load.
Table 04 Operating codes

6.4 Shut-off mode (bXX)

During shut-off mode condition the code-display will show a b, whilst the t-display
indicates the cause with two flashing dots.
Table below details cause of shut-off mode.
Code Description
B@%
Maximum acceptable flow temperature rise exceeded. The boiler will shut
off for ten minutes, then restart. Should the flow temperature conditions
remain the same after 5 attempts, this code will be recorded as a shut-down
failure. Boiler will not lockout.
B@*
Internal check on fan speed. Will go to fault code 28, refer par. 10.2.
B@(
Internal check on fan speed. Will go to fault code 29, refer par. 10.2.
19