Operating And Fault Displays; 1Operating Messages - Buderus Logano plus GB402 Installation And Maintenance Instructions Manual

10
Troubleshooting

10.2 Operating and fault displays

10.2.1 Operating messages
Supple-
Display mentary
code code Cause
2P 564 Temperature rise at
the boiler sensor too
rapid ( > 70 K/min).
OA - Appliance in the
switching
optimisation routine.
OH - The appliance is in
standby mode; there
is no heat demand.
OY - The current boiler
water temperature is
higher than the set
boiler water
temperature.
OP - Waiting for the fan to
ramp up.
OE - The appliance is in
standby mode, there
is an active heat
demand, but an
excess of energy is
being supplied.
OU - Start of the program
sequence to start the
burner.
OC - Burner start begins.
Tab. 20 Operating codes
56
Description
Heat exchanger
protection due to
excessively fast heat-up
speed.
A new burner demand
occurs within the set
switching optimisation
time. Appliance in cycle
block. The standard
switching optimisation
time is 10 min.
The boiler is ready to
operate; there is no heat
demand from the heating
circuit.
The current boiler water
temperature is higher
than the set boiler water
temperature.
The boiler shuts down.
The ramp-up needs to be
detected for the
sequence to be able to
proceed.
The current system heat
demand is lower than
that which the minimum
modulation level of the
burner supplies.
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Logano plus GB402 - Subject to technical modifications!
Test procedure/
cause Action
No or insufficient Ensure adequate heat
heat consumption consumption.
(e.g. thermostatic
valves or mixers
closed).
Inadequate boiler Install adequately sized
flow rate. pumps.
Pump does not work. Check whether the pump
is being switched. Replace
the pump if required.
Deposits on the Flush/clean the boiler
water side of the block on the heating water
boiler (dirt from the side with agents approved
heating system, for use with aluminium.
scaling).
Check output setting Match the boiler output to
at the BC10 base the required heat demand
controller. of the building.
Check the control Match the control setting
setting in the RC35 to the system conditions.
control unit.
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