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Fault in
Central Heating
Fault in
Domestic Hot Water
Is mains LED flashing?
Is mains LED
iluminated?
Turn control knob
fully clockwise
Set room stat to
call for heat
Ensure link is fitted at
X2 pins 2 & 3
Set clock to call for heat
Has overheat
thermostat tripped
Ensure link is fitted at
X2 pins 5 & 6
Is mains LED flashing?
GO TO
CHECK D
GO TO
CHECK K
GO TO
CHECK K
GO TO
CHECK E
GO TO
CHECK F
GO TO
CHECK O
GO TO
CHECK C
Is control knob
set for demand?
Is a room thermostat
fitted?
Is room thermostat
calling for heating?
Is programmer fitted?
Is programmer calling
for heat?
Is pump running?
Has overheat
thermostat tripped?
Is mains LED
illuminated?
YES
YES
YES
YES
YES
YES
NO
YES
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO