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