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Pilot will not stay
lit
Pilot burning no
gas to burners
Back burner stays
on when switched
to off position.
19-07-05
Incorrect operation.
Weak or improperly
located pilot flame.
Thermocouple not
properly connected.
Defective thermocouple.
Faulty control valve.
Burner injectors may be
blocked.
Faulty control
Build up on the control
valve.
Page 17 of 20
Operator not following correct lighting
procedure, see lighting instructions.
Adjust the height of the thermocouple
(using the brass nut at its base)
The flame should engulf the top 8mm of
the thermocouple.
Check back of main control where
thermocouples copper tube enters the
control. Tighten brass collar nut.
Replace thermocouple
A new thermocouple may be ordered
through your YUNCA agent.
(See parts list.)
A replacement may be fitted by a
suitably qualified service person.
(See parts list).
Disconnect gas supply at burners and
unscrew brass injectors from end of
burner. Use compressed air to clean out
orifice.
Control requires replacement.
Disassemble the control valve by
removing the two screws below the
cover. Extract the control valve, note the
position. Clean the control valve clean
and re-assemble. Test operation.
Operation Instructions for Jervois Freestanding Gas Heater March 2002
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