44
Chart I
Check electr ical suppl y
Ð
C.H . senso r and frost protec tion
Check t h e foll owing carefully before starting
•
Gas supply is on, adequate and purged.
•
Electric supply is on.
•
Polarity is cor rect.
•
Pumps pins freely.
Se lec t the CH position
Is l cd disp lay on ?
NO
YES
Is 23 0 V ac pr esen t
on terminals X1?
NO
Check
supply lead ,
F1 -fu ses and
replace if necessary
Is lcd disp lay on ?
YES
NO
Repla ce
interface
card
Repla ce
main PCB
NO
Is F0 failure code shown on lcd?
NO
YES
Is w ater pressure
bet w een 1 and 2 ba r?
NO
Fill up system to 1 -2 bar
Check low w ater
pre ssure sen sor
cable connec tion s
YES
Check and if
nec essary repl ace
low w ater pressure
switch
NO
Does fan run at sta rt
sp eed?
YES
Does pump
YES
Is F3 failure cod e
shown on lcd ?
YES
NO
Change m ain PC B ?
NO
NO, and F8 failure cod e sh owing on lcd (afte r 1m inute)
Go to Cha rt 4
Check supply lead
Check C H sen sor
cab le connection s
Is F3 failure code shown on lcd?
YES
Check pump connection cables and
230 V ac supplying o f pump
Does pump run?
NO
Does burner w ork ?
YES
NO
Go to Char t 5
Winte r mode is sele cted by function
selec tor knob on front pa n el
Ch heat demand present
Chart I
Check electrical supply D C.H. s ensor and frost prot ection
Chart II
Check Domestic Hot Water Operation
Check if w ater filter
is clean
Check if Turbine
stuck
NO
Open DH W taps
Is DHW Mechanical flow rate at least 2 lt/min ?
NO
Check cold water
inlet pressure
YES
Is F2 or F3 failure
co des shown on lcd?
YES
Check and if
nec essary repl ace
DHW or CH
supply/return
sensor
Check and if
necessary replac e
water flow sensor
Is F1 failure code
shown on lcd?
YES
Check and if
necessary replace
overheat thermostat,
check pump,
Check Stepper
motor stuck
NO
Go to Chart VI
Check if DHW
sym bol sh own on
lcd?
NO
Check and if
nec essary repl ace
DHW tur bine
sen sor/ w iring
20. Fault Finding Chart
Содержание SARGON 18S
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