Spirax Sarco BC3250, Installation And Maintenance Instructions Manual

Page: 58 / 76

IM-P403-89 EMM Issue 8 58
Error
message
Cause Action
5
VALVE
FAILED TO
CLOSE
Blowdown valve
fails to close fully
1. Check the correct closing time has been
entered in the INPUT - CLOSING menu.
2.
See VALVE FAILED TO OPEN.
3. Enter the commissioning mode and enter
the correct passcode.*
4. Press
OK
to Clear.
6
PROBE
SCALED
(CP32 Only)
The probe drive
has increased
to the maximum
voltage.
1. The probe tip may be scaled. Ensure the
correct water treatment is be used.
2.
Ensure the boiler water is not been
contaminated.
3. Check the probe wiring.
4. Inspect the probe tip for damage.
5. Press
OK
to Clear.
7
ALARM IS
LATCHED!
Some errors
latch the alarm
relay for safety.
Clearing the
error from the
error screen just
removes the
message.
1. Enter the commissioning (setup) mode.
If the correct password is entered all the
latched alarms will be cleared.
2. Press
OK
to Clear.
9.4 Determining the probe condition
The probe condition can be checked without removing it from the boiler.
From the run menu select probe factor (PF) and compare it with the following table:
Probe factors Typical
BCS1, BCS2, and BCS4 0.2 – 0.6
BCS3
0.3 – 0.7
A low cell constant (PROBE F) indicates that the probe is able to conduct well, whereas a
high cell constant indicates that the probe tip has become less conductive, perhaps due to
a build-up of scale.
A very low cell constant, however, could indicate an internal short circuit. The further the
probe tips from any part of the boiler, the higher the cell constant.