IDEAL 47-348-18 - Fault Finding Flowchart (Part 6)

FA ULT FINDING
Mini Installation & Servicing
53
yes
no
Continued from
page 51 of fault
finding
yes
yes
no
no
Is there continuity of
overheat thermostat
wiring at PCB
connection?
Has th e main
overheat thermostat
operated? (Check
continuity)
Replace f au lty gas
valve
Allow boiler to cool
and press re --- set
Repair or replace
damaged wiring
yes
Is LED 1 and LED 2
flashing and LED 3
on?
Is LED 1 on and
LED 2 and LED 3
flashing?
Wait for 1 minute. Is
the fan still running?
no no
yes
Is there 230V at
the fan
connections?
Replace f au lty fan.
no
no
yes
yes
Repair or replace
faulty wiring.
Is there continuity of the
Air Pressure Switch
harness?
Is there continuity
between NC and C at the
Air Pressure Switch?
Replace f au lty Air
Pressure Switch.
Replace fau lty PCB
Repair or replace
faulty flame
detection signal
connection harness.
Refer to f rame 43.
yes
yes
yes
no
no
no
no
no
yes
yes
Are the sensing
pipes undamaged
and connected?
Is there continuity
across C and NO on
the Air Pressure
Switch?
Clear flue
Repair or replace
venturi
Is the burner on?
Istheflueclearand
venturi O.K?
Replace sensing
pipes.
Repair or replace
faulty wiring.
Is the Air Pressure
Switch h arness
continuity O.K?
Replace f au lty Air
Pressure Switch
Replace fau lty PCB
yes
no
Is LED 1, LED 2
and L E D 3 on?
yes
Replace f au lty
PCB
FAULT FINDING