page no. 38 of 48
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NVx Range Users, Installation & Servicing Instructions Doc Ref M104 issue 1.0 Sep 2018.
NO
NO
NO
Is there
now 230V between
Pactrol controller terminals
CON5 - pin 1 and
pin 2?
NO
Burner in Lockout.
Press the illuminated
amber rocker switch
Is there
continuity between
Pactrol controller terminals
CON5 - pin 1 and
pin 7?
Is there
230V between
Pactrol controller terminals
CON5 - pin 3 and
Neutral?
YES
Is
there
230V at
contractors terminal 6?
AMBER
lamp will be
indicating
YES
NO
NO
TURN ON MAINS
ISOLATOR!
Check the
internal fuse
inside the
Pactrol
Is
there
NOW
continuity
between Pactrol controller
terminals CON5 - pin
1 and pin
7?
NO
Replace
Pactrol!
Check for break
in BROWN cable.
YES
Is there
230V between
Pactrol controller terminals
CON5 - pin 1 and
pin 2?
START
YES
YES
YES
Is the unit
in overheat trip?
RED
lamp will be
indicating
NO
No call for heat!
Check controller!
Is
there
230V at
contractors
terminal
1?
Is the exhaust fan
running?
NO
Is there
230V on the
WHITE
cable to the 'N.O' terminal
of the Pressure
switch?
Replace
Pactrol!
YES
NO
Is
there 230V on the
YELLOW
cable to the 'C'
terminal of the Pressure
switch?
YES
Pressure Swirch stuck
in a closed position
Change A.P.S.!
YES
Heater in Overheat.
Remove the black cap
and press the button
YES
Check for break
in WHITE &
GREY cables.
Is
the inpulse tube
connected to the negative
connection ofthe pressure
switch?
YES
Is
there 230V on the
YELLOW
cable to the 'C'
terminal of the Pressure
switch?
YES
NO
NO
Swap terminals
Still not
working?
Continued on
next page
Replace
Pactrol!
YES
NO
Replace
Combustion
Fan!
NO
YES