9 fault finding – Glow-worm Ultimate 30BF User Manual

Page 21

221788B

YES

Check gas line - open all cocks,
rectify any blockages, purge out
any air. Does pilot light?

Apply match to pilot burner instead of
pressing piezo unit button.
Does pilot light?

Undo tubing nut at pilot burner.
Press multi-functional control knob.
Does gas flow freely?

Rectify blockage in pilot injector,
or renew pilot injector.

Undo tubing nut at pilot outlet
of gas valve. Press gas valve knob.
Does gas flow freely?

Change blocked pilot tube.

Change multi-functional control.

Does pilot stay alight when
multi-functional control knob is
released?

Does pilot flame
envelope thermocoupling?

Check aeration. If necessary -
Clean pilot, rectify blockage in pilot
injector, or replace.

Check thermocoupling circuit using
Thermocoupling Fault - Finding
diagram.

On pressing piezo unit button
is there a spark across
electrode gap?

Pull ignition lead off electrode.
Hold end of lead close to pilot
burner and operate piezo unit.
Is there a spark across gap?

Pull ignition lead off piezo unit.
Using blade of a screwdriver, touch
unit chassis and leave approx.
4mm gap from connection tag on
piezo unit. Operate piezo.
Is there a spark across gap?

Change
piezo unit.

Change
ignition unit.

Check electrode gap. Reposition, or
replace electrode as necessary.

PILOT SATISFACTORY

9 Fault Finding

PILOT WILL NOT LIGHT
START HERE

Diagram 9.1

0032M