5
Trouble-shooting
14
©
Moffat Ltd, January 2007
Revision 1/
Blue Seal Evolution Series Gas Salamander
5.2
Fault Diagnosis
5.2.1 Pilot drops out when gas
knob released
Pilot flame too small
If pilot can be lit but the flame is too small to
impinge on the thermocouple, then check the gas
pressure. If ok, remove pilot injector from pilot
burner and check for blockages and/or correct
size.
Thermocouple faulty
Check thermocouple connection to gas control is
firm (loose connections will cause resistance in
millivolt circuit and result in pilot outage).
If connection is OK, then disconnect the
thermocouple from the rear of the gas control,
light the pilot, and whilst holding the control
knob in, and measure voltage between the
thermocouple and earth (e.g. the body of the gas
control). This should read approximately 30mV.
If this reading is less than 10mV then the
thermocouple is faulty—replace.
Gas magnet faulty
If thermocouple milli-voltage is above 10mV, and
the pilot still will not hold, then the gas magnet is
faulty - replace.
5.2.2 Burner popping / Blow back
Gas leak in burner plaque
With burner operating check for hairline cracks
(these appear as brighter orange lines on burner
tiles). If visible, replace burner.
