
FAULT FINDING
52
Mini
--- Installation & Servicing
Is the fan running?
Is there 230V at the
fan connectors?
Is LED 1 on and LED
2 flashing?
Is LED 1 flashing and
LED 2 and LED 3 on?
Replace faulty PCB #
1
Replace faulty PCB #
1.
Switch to on position.
Switch to on position.
Is there continuity
between NC and C at
the Air Pressure
Switch?
Replace faulty Air
Pressure switch.
Is there continuity
across C and NO on
the Air Pressure
Switch?
Is there continuity of
the Air Pressure
Switch harness?
Repair or replace
faulty wiring.
Is there 230V at
pin 101 PCB # 2?
Are the connections
between PCB # 1 and
PCB # 2 are O.K?
Replace faulty PCB #
2.
Replace faulty PCB #
1.
Repair or replace
wiring.
Replace faulty fan.
Are the sensing pipes
undamaged and
connected?
Replace sensing
pipes.
Is the flue clear and
venturi O.K?
Clear flue.
Repair or replace.
Replace faulty Air
Pressure Switch.
Is the Air Pressure
Switch harness
continuity O.K?
Repair or replace
faulty wiring.
Is the burner on?
Replace faulty PCB #
2.
Continued from
page 50 of fault
finding
Repair or replace
faulty flame detection
signal connection
harness. Refer to
frame 43.
yes
yes
yes
yes
no
no
no
no
no
no
no
no
no
no
no
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
no
no
no
Is dip---switch # 3 in
the off position?
Refer to frame 29.
Is dip---switch # 3 in
the off position?
Refer to frame 29.
FA
U
LT
F
IN
D
IN
G