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4.4.1. Electrical Fault Finding Chart
Electrical fault finding must be carried out by competent persons only. A suitable electrical
test meter will be required for some of the tests listed.
Switch on the Mains
Power Supply at
Isolating Switch
START
At mains isolating
switch check 3 amp
fuse - replace if
necessary, and check
for wiring faults
Replace On/Off
Switch
Replace fan unit
Check continuity across
relay coil - replace if
necessary
Replace air
Pressure
Switch
Replace Solenoid
Valve
Refer to Installation
and Operational
Troubleshooting
Does
green neon
light up?
Does
the main burner
come on?
Is there
230v-240v
across fan
terminals?
Is there
230v-240v
across terminals
2&4 in control
box?
Is there
230v-240v
across terminals
2&3 in control
box?
Does fan
cycle
on/off?
Does the
Fan Start?
Switch on the
Fan On/Off Switch
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
No
No
All connections/continuity should be verified before replacing any components