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10 Troubleshooting
Logano plus GB402 – 6 720 804 428 (2012/09)
44
10.2 Operating and fault displays
10.2.1 Operating messages
Display code Sub-code Cause Description
Test procedure/
cause
Correction
2P 564 Temperature rise at the
boiler sensor too rapid
( > 70 K/min).
Heat exchanger protection
due to excessively fast heat-
up speed.
No or insufficient heat
transfer (e.g.
thermostatic valves or
mixers closed).
Ensure adequate heat transfer.
Inadequate boiler flow
rate.
Install adequately sized pumps.
Pump does not work. Check whether the pump is
being switched. Replace the
pump if required.
Deposits on the water
side of the boiler (dirt
from the heating system,
scaling).
Flush/clean the boiler block on
the heating water side with
agents approved for use with
aluminium.
OA - Appliance in switching
optimisation prog.
A new burner demand occurs
within the set switching
optimisation time. Appliance
in cycle block. The standard
switching optimisation time is
10 min.
Check output setting at
the BC10 basic controller.
Match the boiler output to the
required heat demand of the
building.
Check the control setting
in the RC35 control unit.
Match the control setting to the
system conditions.
OH - The appliance is in
standby mode; there is no
heat demand.
The boiler is ready to operate;
there is no heat demand from
the heating circuit.
--
OY - The current boiler water
temperature is higher
than the set boiler water
temperature.
The current boiler water
temperature is higher than the
set boiler water temperature.
The boiler shuts down.
- -
OP - Waiting for the fan to
ramp up.
The ramp-up needs to be
detected for the sequence to
be able to proceed.
--
OE - The appliance is in
standby mode, there is an
active heat demand, but
an excess of energy is
being supplied.
The current system heat
demand is lower than that
which the minimum
modulation level of the burner
supplies.
- -
OU - Start of the program
sequence to start the
burner.
---
OC - Burner start begins. - - -
OL - Opening the gas train. - - -
OF - Insufficient boiler flow
rate.
Temperature differential
between the flow and return
>15K.
Temperature differential
between flow and safety
temperature sensor > 15K.
Check the flow
temperature on the
BC10,
check the return
temperature with RC35 or
the service key,
measure the resistance of
the boiler sensor (high
limit safety cut-out (STB))
and compare with the
curve.
Adjust the setting of the boiler
circuit pump.
Check the surface temperature
of the cast section that is
equipped with the safety
temperature sensor using a
thermometer.
Check whether a cast section is
blocked with dirt.
Tab. 21 Operating codes
44


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