Saunier Duval SYLVA FF 24 E, Инструкции по обслуживанию

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14
FAULT FINDING
CHART N
°
1
NO CENTRAL
HEATING
CHART N
°
2
NO DOMESTIC
HOT WATER
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
YES
YES
Does burner fire?
Refer to chart No.3.
Set controls to call for heat.
Are external controls wired?
Rectify wiring.
Is burner pressure correct? -
Refer to technical data.
Heating ok.
Is the range rating potentiometer
correctly adjusted?
Adjust potentiometer to required
setting - does potentiometer
adjust burner pressure?
Faulty potentiometer - replace
PCB.
YES
YES
Does burner fire when a hot tap
is opened for approximately 3
minutes ?
Is plug to the external controls
connected to the boiler ?
Connect external controls plug.
Remove leads from central
heating thermistor. Check its
resistance in accordance with
diagram 17 - is central heating
thermistor OK ?
Remove potentiometer connec-
tor from A5 on PCB. Check resis-
tance of heating potentiometer
between white and black leads
- does it adjust between 0-1 k
Ω
?
Replace central heat-
ing potentiometer
Replace central
heating thermistor
Faulty PCB - replace
Are heating controls calling for heat ?
NO
NO
NO
NO
NO
YES
DHW ok.
Replace domestic hot water
thermostat
Replace 3 - way
valve head
Refer to
chart N
°
5
NO
NO
NO
YES
YES
YES
YES
YES
YES
With the "Summer/winter" switch in the
winter, hot water and central heating
position - does the burne fire for central
heating ?
Refer to chart No.3.
Remove domestic hot water thermostat
connector from A3 on PCB. Turn thermos-
tat up maximum - Is there continuity bet-
ween the two thermostat leads ?
Check PCB - replace if necessary
Replace domestic hot water thermostat
Is the hot water hot enough ?
Adjust domestic hot water
thermostat
Is the domestic hot water
thermostat set to the desired
position ?
Check operation of 3 - way valve
- is there flow of hot water to
storage cylinder flow pipe ?
Is domestic hot water thermostat
working correctly, that is, by
turning to maximum does burner
fire, by turning to minimum does
burner go out ?
Operate 3 - way valve
manually - is there flow
of hot water to storage
cylinder flow pipe ?
Does the burner fire when a hot tap is
opened for aproximately 3 minutes ?