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FAULT FINDING
56
mini HE --- Installation & Servicing
Continued f rom page 55
of fault finding
Refer b ack to page 52 of
fault finding to continue.
Is the position of the
detection electrode
correct, and electrode
undamaged? Refer to
frame 49.
Adjust burner pressure.
Refer to frame 35.
yes
no
no
no
no
no
yes
yes
yes
yes
yes
Is the r esistance of the
detection electrode
assembly < 5Ω from tip to
connector ?
no
Is the polarity of
the mains correct?
Replace faul ty detection
lead assy.
Rectify electrode
position or replace
faulty electrode.
Does the burner
remain alight more
than 10 seconds?
Connect lead correctlyIs the lead connected ?
Replace faul ty PCB
Is the burner pressure
within min and max
value* with the boiler
running?
Rectify wiring fault
no
yes
Isthecondensefreely
discharged through the
condensate tr ap and
pipework?
Check the condensate trap
and discharge pipework for
cleanliness
* see Table 2 at page 4 for the correct value
Replace faul ty PCB
yes
Is th e burner light on?
no
Can the minimum burner
pressure be achieved ?
(Pressure values are given
in Table 2 on page 4)
no
yes
Adjust the burner minimum
pressure refer to frame 35
FAULT FINDING