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) 49
V 4U 521 Excessive sensor
differential at the
boiler sensor
between
temperature
sensors 1 and 2. Temperature
differential between
temperature sensors 1
and 2 is too
high(deviation > 5 K/
2s). Check that the "Reset" button
illuminates on the SAFe. Press "Reset" on the SAFe.
Check that the check valve on the
cylinder primary pump is closed. Close the check valve if it is still
open.
Check whether the flow and
return have been connected
correctly. If flow and return have been
swapped, connect flow and
return correctly.
Check whether the plug-in
connection on the boiler sensor
and on the SAFe are
contaminated or damaged. If required, clean or replace the
plug-in connections.
Check the resistances at the
boiler sensor according to table or
visually inspect the plug at the
temperature sensor. Replace the boiler sensor if the
sensor values deviate from the
stated values, or if the plug is
faulty.
Check the voltage values on the
boiler sensor according to table. Replace the SAFe if there are
deviations.
V 4U 522 Boiler sensor
short circuit
between
temperature
sensors 1 and 2. A temperature sensor
fault was detected in
test mode. Check the sensor lead.
Check the plug-in connector.
Replace if damaged.
Clean if dirty or replace if
necessary.
Refit plug it is found to be
loose.
Check the sensor values against
the table. Replace the temperature
sensor, if there are any
deviations from the table.
Check the voltage at the
temperature sensor according to
table. Replace the SAFe in case of
deviations.
V 4Y 523 Interruption in the
boiler
temperature
sensor. Temperature too low at
the boiler temperature
sensor
(< -5 °C) Check the sensor lead. Replace if damaged.
Check the plug-in connector. Clean if dirty or replace if
necessary.
Replace if damaged.
Refit plug it is found to be
loose.
Check the sensor values against
the table. Replace the temperature
sensor, if there are any
deviations from the table.
Check the voltage at the
temperature sensor according to
table (SAFe documentation). Replace the SAFe in case of
deviations.
V 4U 524 Boiler sensor
short circuit. The boiler sensor
detected an
excessively high
temperature (> 130
°C). Check the sensor lead. Replace if damaged.
Check the plug-in connector. Clean if dirty or replace if
necessary.
Replace if damaged.
Refit plug it is found to be
loose.
Check the sensor values against
the table. Replace the temperature
sensor, if there are any
deviations from the table.
Check the voltage at the
temperature sensor according to
table (SAFe documentation). Replace the SAFe in case of
deviations.
V 4A 575 Intelligent high
limit safety
cut-out responds. The boiler flow
temperature has
reached its maximum
permitted level. High-limit safety cut-out has
triggered. Check the gas valve.
(Does the flame extinguish
after a controlled shutdown?)
Type
1)
Display code Fault Code Reason Description: Test procedure/cause Corrective measure
Table 23 Fault displays
1) V = locking; B = blocking