Operating And Fault Indications; Status Indicator - Buderus Logano plus GB312 Installation And Service Instructions Manual

10
Troubleshooting
10.2

Operating and fault indications

10.2.1 Status indicator

1)
Type Display code Event code Cause
2P 564
BC OA -
BC OH -
BC OY -
BC OP -
BC OE -
BC OU -
BC OC -
BC OL -
BC OF -
Table 22 Operating codes1) V = interlocking; B = inhibiting; BC = operating code
52
Description
Temperature rises too Heat exchanger cut-out due to
quickly at the boiler excessive rate of temperature
temperature sensor rise.
( >126°F/min; >70°K/
min).
Appliance is in A new burner demand occurs
optimized switching within the set switching
mode. optimization time. Appliance
is in anti-cycle phase. The
standard switching
optimization time is 10 min.
The appliance is in The boiler is on standby and
standby mode; no there is no call for heat from
heat demand present. the heating zone.
The current boiler The current boiler
temperature is higher temperature is higher than the
than the set boiler set boiler water temperature.
water temperature. The boiler shuts down.
Waiting for fan to start Start-up of the fan has to be
up. detected before the sequence
can be continued.
The appliance is in The current heat demand from
standby mode, heat the heating system is lower
demand is present than that supplied by the
but too much heat is minimum burner modulation
being delivered. setting.
Beginning of burner -
start-up sequence.
Beginning of burner -
start-up.
Gas valve opening. -
Lack of flow through Temperature difference
boiler. between supply and return
> 27 °F, > 15 K.
Temperature differential
between boiler supply and
high limit temp. sensor
> 27 °F, 15 K.
Test procedure/cause Measure
Little or no heat draw (e.g. Ensure adequate heat
thermostatic valves and transfer.
mixer closed).
Boiler loop flow rate too Install adequately
low. dimensioned pumps.
Pump does not work. Check whether the pump
is being activated. Replace
pump if necessary.
Pump installed opposite to Install pump in the correct
intended direction of flow. orientation.
Flush/clean water side of
Deposits in water carrying
boiler heat exchanger with
parts of boiler (dirt from
agents suitable and
heating system, limescale).
approved for aluminum
Check output setting on Adjust boiler output to
BC10 basic control unit. required heat demand for
building.
Check control setting on Adjust control setting to
RC35 controller. system conditions.
- -
- -
- -
- -
- -
- -
- -
Check supply temp. with Adjust the heating pump
BC10, setting.
Check return temp. with
RC35 or service keys,
Use a temperature
Check resistance of high
measuring instrument to
limit temp. sensor.
check the surface
temperature of cast
section in which the high
limit temp. sensor is
mounted.
Check if cast section is
blocked with dirt.
Logano plus GB312 – 6 720 806 273 (2013/01)