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SECTION 16: TROUBLESHOOTING
65 of 75
16.1 Troubleshooting Flow Chart (Linear, Double Linear and U-Tube)
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Replace ignition
module.
Is there power out
from pin 10 on
ignition module?
Replace Fan.
Turn up thermostat.
Does the fan turn on?
Place a jumper across
the thermostat terminals.
Does the fan turn on?
Check thermostat wiring
and replace thermostat if
necessary.
Is there power (230V)
at the burner?
Check relay wiring
(if applicable) and wiring
to the burner.
Remove Black & White
leads from the pressure switch;
place jumper between leads.
Does the fan turn on?
Replace pressure switch.
Remove obstruction.
Unplug burner.
Does the fan
turn freely?
Is the fan obstructed?
Fan bearings may have
failed. Replace fan.
Remove obstruction.
Repair, replace or
tighten hoses
as necessary.
Is the flue pipe or
the inlet of the
burner obstructed?
Are the hoses to the pressure
switch secure and leak free?
Remove Black and Yellow
leads from the pressure switch;
place a jumper between leads.
Is there a spark?
Replace pressure switch.
Is the igniter gap
set at 3 mm?
Carefully reset gap
to 3 mm.
Replace automatic
control unit.
Unplug burner and check
electrode and ignition wire.
Are they damaged?
Replace electrode and
ignition wire as needed.
Is there spark at the igniter?