Sime Format 30 HE, Инструкции по установке и обслуживанию

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15
5.5 C.H. MODE - FAULT FINDING
Start from cold Rotary switch set to WINTER position.
Room thermostat (if fitted) calling for heat and all D.H.W. taps off.
C.H. thermostat set to maximum position.
Clock in the on position (if fitted).
NOTE:
After completing fault finding reset the room thermostat (if fitted) to the required setting. If the appliance will not function check the wiring
to the clock and if necessary, replace the clock.
Is there power
at the external
socket?
Make
power
available
Does
the pump
start?
Does
the fan
start?
Turn the clock
in the right
position
Is fuse
at mains
plug OK?
Is the clock in
the correct
band time?
Is there voltage
available
to the fan?
Does the boiler
remain in
pre-purge mode?
Replace
the clock
Replace fuse in
mains plug
Check the
time clock does
his contacts
open and close
when the clock
turns?
Replace
the fan
Is limit
thermostat
calling for heat?
Replace the
limit thermostat
Make it free to
rotate
Put a jumper on
the room thermo-
stat connection
Replace
the fuse
Check the
power supply
cable
Is the micro-switch
on the diverter
valve locked?
Is pump shaft
free to rotate?
Is fuse
0,6 A OK?
Is there voltage
available
to the pump?
Does the
micro-switch
operate correctly?
Replace the
microswitch
Replace
the pump
Check pump
connection
Loose the screw
on the flow
switch cover
Does the boiler
lock-out without
starting the
burner?
The boiler
lock-out
starting
the burner
Does the fan
speed decrease
reducing the flow
temperature
setting on
the C.H. knob?
Check:
2) C.H.
thermistor
3) PCB control
board
The ignition of the
burner is noisy
Does the
boiler switch
OFF before
achieving the
temperature?
Check the settings
of the gas valve
and “POT. ACC.”
trimmer
Is there a spark
at the ignition
electrode?
reverse
polarity between
phase and neutral
Check the
gas supply
Check for continu-
ity between ignition
electrode and igni-
tion transformer
The gap between
ignition electrode
and hood
is correct?
Fit correctly the
ignition electrode
Is the gas
available? Boiler is
satisfactory
Check the
connection on
the fan PCB
Is there voltage at
the gas valve?
Replace the
gas valve
Yes
No
Is there a jumper
on the room
thermostat
connection?
No
Yes
No
No
Yes
No
Yes
Yes
Yes
Yes
No
Yes
No
No
Yes
Yes
Yes
No Yes
No
Yes Yes
Yes
No
No
Yes Yes
No
Yes
Check the
connections of:
limit
thermostat
and flow switch
in the PCB
control board
Yes
No
No
No No
No
Yes
No
Yes
Yes
Yes
No
No
No
No
Yes
No