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

HTG pump run on
7
DHW pump run on or for three way valve option, HTG pump run on with
8
valve open to DHW (max. 5 minutes)
- Normal control stop during DHW (flow temperature > set point DHW +
9
DHW control stop set point + 5°C)
Shut-off mode
b
Forced full load.
h
Forced part load.
l
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
Maximum acceptable flow temperature rise exceeded. The boiler will shut
B@%
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.
Contacts of the external interlock have opened during heat demand.
b@^
The boiler will shut off for 120 seconds. Should the contacts close again
during heat demand, the boiler will wait the remaining time from the 120
seconds before attempting a restart.
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.
B@(
Maximum temperature difference between flow and return exceeded. The
B#)
boiler will shut off for 150 seconds, then restart. Should the temperature
difference conditions remain the same after 10 attempts, this code will be
recorded as a shut-down failure. Boiler will not lockout.
55979.indd 21 55979.indd 21
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