Sime Format 30 HE Installation And Servicing Instructions page 25

5.6 D.H.W. MODE - FAULT FINDING
Start from cold - rotary switch set to SUMMER position, D.H.W. thermostat set to maximum, and all D.H.W. taps OFF.
No
Is there power Make
at the external power
socket? available
Yes
Yes
Is fuse
at mains
plug OK?
Open any tap.
Is there an
No
adequate flow
rate of D.H.W.
available?
Replace fuse in
mains plug
Yes
Does the
microswitch of the
divertor valve
operate correctly?
No
Replace the
microinterruptor
Check pump
connection
Fit correctly the
ignition electrode
Does the boiler
lock-out without
No
starting the
burner?
The gap between
ignition electrode
and hood
is correct?
Yes
Yes
Check for continu- No
Is there a spark
ity between ignition
at the ignition
electrode and igni-
electrode?
tion transformer
Yes
No
Is the gas
Check the
available?
gas supply
Yes
No
Check the
Is there voltage at
connection on
the gas valve?
the fan PCB
Yes
Replace the
gas valve
NOTE:
When commissioning the boiler, please check the polarity in case the pump and the fan are running but the burner does not fire.
No
Clean or replace
the divertor valve
Yes
Does
Make it free to
the pump
start?
No
Yes Yes
Is there voltage
Is pump shaft
available
free to rotate?
to the pump?
No
Yes
Is fuse Replace
0,6 A OK? the pump
No
Replace
the fuse
No No
The ignition of the
burner is noisy
The boiler
lock-out
starting
the burner
Check the settings
of the gas valve
and "POT. ACC."
trimmer
Yes
Is the ionisation
probe
connected to the
main PCB?
Yes
No
Restore the
connection
Fit correctly the
ionistation probe
Yes
Does
the fan
start?
No
Is there voltage
available
to the fan?
No
Yes
Replace
rotate the fan
No
Check the
power supply
cable
Yes
No
Does the fan
speed decrease
reducing the flow
Yes
temperature
setting on the
D.H.W. knob?
Yes
Does the
boiler switch
OFF before
achieving the
temperature?
No
Does the boiler
remain in
pre-purge mode?
Yes
No
Is limit
Replace the
thermostat
limit thermostat
calling for heat?
Yes
Yes
Is the micro-switch Loose the screw
on the diverter
on the flow
valve locked? switch cover
No
Yes
Does the
micro-switch
operate correctly?
Check the
connections of:
limit thermostat
No
and flow switch
in the PCB
control board
Replace the
microswitch
No
Check:
2) C.H.
thermistor
3) PCB control
board
No
Yes
Boiler is
satisfactory
25