Buderus GB402-320-5, Инструкции по установке и обслуживанию для подрядчиков

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11 Troubleshooting
Logano plus GB402 – 6 720 820 700 (2018/01) 48
11.3.2 Control unit fault displays
Type
1)
Display code Fault Code Reason Description: Test procedure/cause Corrective measure
B 2E 207 Water pressure
< 0.6 bar. – Check whether the pressure in
the system is at least 1 bar. Correct the operating
pressure.
V 2U 533 Incorrect
hydraulic
connection of
boiler or pump. The boiler control unit
has detected an
incorrect flow on the
water side. Check whether the boiler flow and
return have been accidentally
swapped.
Check pump for correct flow
direction. Connect the flow and return
correctly.
Ensure correct flow direction
for the pumps.
B 2U 565 Excessive
differential
between the flow
and return
temperature.
> 40 K
Heat exchanger
protection due to
excessive temperature
spread. Problems in the hydraulics. Check the system hydraulics.
V 2U 575 Intelligent
high-limit safety
cut-out (ISTB) for
the flow. The actual boiler flow
temperature reaches
the intelligent high-limit
safety temperature for
the flow of 140 °C, and
an ionisation current is
detected or the
solenoid valves are
open. Check the flow rate on the water
side. Ensure adequate flow rate.
Replace boiler sensor/high
limit safety cut-out (STB).
Replace ignition/monitoring
electrode.
V 3C 537 No speed. The SAFe receives no
speed feedback,
although the fan is
supposed to be
running. Check cabling between the SAFe
and the fan for contact
separation, breaks and damage.
Check plug-in connection at the
SAFe and the fan.
Establish the contacts
correctly. Replace cable if
required.
If power is available (no fan
start), replace fan.
V 3C 538 Fan speed too
low. The detected speed is
lower than the
specified speed. Contamination in the fan. Clean fan if required.
Fan defective. Replace the fan.
V 3C 540 Excessively high
fan speed. The detected speed is
higher than the
specified speed. Check PWM signal/SAFe cabling
for contact separation, breaks or
damage.
Check plug-in connectors for
damage.
Establish the contacts
correctly. Replace cable if
required.
Replace the fan.
V 4A 520 Intelligent high
limit safety
cut-out in flow. The flow temperature
has reached a value of
100 °C. The temperature rise is monitored
by the boiler sensor.
Consequently the burner is
switched off in good time, making
an occurrence of this fault
message under normal
circumstances unlikely.
Unfavourable hydraulics in
two-boiler systems: the boilers
influence each other reciprocally,
e.g. via the return or flow.
Check hydraulics.
Table 23 Fault displays
1) V = locking; B = blocking