
FAULT FINDING
Mini
Installation & Servicing
49
Are LED 2 and LED 3
flashing?
Is LED 2 flashing and
LED 3 on?
Repair or replace
faulty wiring.
Replace faulty
thermistor.
Replace faulty
thermistor.
Repair or replace
faulty wiring.
Is the heating circuit
pressurised to at least
1 bar and fully vented
of air?
Re---pressurise system
and vent.
Remove the pump
nut. Does the pump
rotate freely when
turned?
Replace faulty pump.
Is there continuity
between C and NO
contacts on micro
switch when the
switch is operated?
Replace faulty micro
switch.
Is the continuity of the
micro switch wiring
harness O.K?
Repair or replace
faulty wiring.
Replace faulty PCB
#1.
Continued from
page 47 of fault
finding. Is the green
LED on front fascia
flashing 4 times per
second?
Access the 4 dip
switches on p.c.b. #1.
Move the #1 dip
switch off’ then ’on’.
This activates p.c.b.
service mode. Refer to
fault code frame 68. Is
LED 1 flashing with
LED 2 on ?
When the pump
runs does the
spindle of the water
flow detector
extend to operate
the micro switch?
Refer to frame 58.
Replace faulty
diaphragm and clean
housing of debris, if any.
refer to frame 59.
Continued on page
50 of fault finding
no
yes
no
no
no
no
no
no
no
no
no
yes
yes
yes
yes
yes
yes
yes
yes
Check resistance of
DHW thermistor. Is
it between 12 k
W
and 1.5 k
W
?
Check resistance of
CH thermistor. Is it
between 12 k
W
and
1.5 k
W
?
FA
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LT
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IN
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