92
Notes 1 - Are burner plugs correctly
fitted?
Check that all three plugs are fully
pushed into sockets on the left side
of the burner – in particular plug No.2.
Refer to Section 8 and Figure 8-5.
Note 2 - Is heating thermistor
damaged?
Isolate electrical supply to boiler and
remove boiler control panel cover.
Check the condition of the thermistor for
any damage and replace if necessary.
Check that the heating thermistor is
correctly fitted into the pocket (inside
the boiler control panel). Refer to
Section 10.3.1. Ensure that both
thermistor and thermostat sensor are
held in place with the retaining clip
supplied.
Note 3 - Is thermistor connected to
burner PCB?
With electrical supply to boiler still
isolated, remove both the burner cover
and PCB cover. Check the thermistor
connections to the PCB – from
terminals S3 and B4 on plug/socket
No.2. Refer to Section 8 and Figure 8-6.
If fault still exists, replace thermistor.
12.8 Probe Fault
Primary fault
Secondary follow on checks
PROBE FAULT
Are all three
burner plugs
correctly fitted?
Yes
Yes
No
Is the heating
thermistor
damaged?
Is thermistor
connected to
control PCB?
Replace
thermistor
Replace
thermistor
Check thermistor
connections
from burner plug/
socket to control
PCB
No
Yes
No
Note 1
Note 2
Note 3
Correctly fit
plugs – push
fully into sockets
H2o 60˚C
SET 75˚C
PROBE FAI
Содержание Spira 5-18
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