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yes
yes
yes
yes
yes
yes
yes
yes
no
no
no
no
no
no
no
Check
voltage present at
GATE 12 ECO
Check
voltage present at
GATE 11 BURNER
AUTOMATION
Pressure
H higher then
300 PA?
Pressure L less
then 0 PA?
Check
voltage present at
GATE 2 BURNER
AUTOMATION
Does the RESET
switch light up?
Check
voltage present at
GATE 10 BURNER
AUTOMATION
Ensure connections
correct, if yes replace
ECO
Ensure connections
correct
Measure pressure at
hose
H at the column
Ensure connections
correct, if yes
check hose H for
leakkage or blockings
Ensure connections
correct, if yes
check hose L for
leakkage or blockings
Check exhaust system on
blockings if the exhaust
system is open, replace AIR
PROVING SWITCH
Replace
BURNER AUTOMATION
Problem solved
Ensure connections
correct, if yes replace
RESET switch
RESET the water heater
and wait one cycle,
advanced Fault Finding