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5
Fault Finding
15
©
Moffat Ltd, August 2012
Revision 3
Moffat Cobra Series CS9 - Gas Salamander
5.2
Fault Diagnosis
5.2.1 Burner Drops Out When Gas
Knob Released
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 burner, 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 Valve Electromagnet Faulty
If thermocouple milli-voltage is above 10mV, and
the burner still will not hold, then the gas electro-
magnet is faulty - replace.
5.2.2 Burner Popping / Blow Back
Gas Leak in Main Burner Plaque
With the burner operating, check for hairline
cracks on the burner tiles (these will appear as
brighter orange lines on the burner tiles). If
visible, replace the main burner.
Содержание CS9
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