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UNIT HEATER
STA RT
Assuming gas & electrical
supplies are ON
NO NO
Does pilot flame light when Try igniting pilot with Ensure that there is a gas
gas valve button is pressed a lighted taper & electricity supply.
in & piezo igniter is Ensure that the limit
re pe a te dly presse d YES thermostats have not
operated.
YES See 8.3
Piezo faulty. Replace
NO
Does pilot remain on when Use 8.3.1 to trace fault
start button is released
YES
NO NO
Does main burner come ON Check all controls are ON Use 8.4 to trace fault
& that the gas valve knob
YES is in the B URNER ON
position
NO
Does fan run after burner Use 8.5 to trace fault
has run for several minutes ?
YES
Heater Working
8.1.1 General - Manual Ignition
Warning
Fault finding should only be carried out by experienced engineers who fully understand the
operation of the burners.
There is a risk, including that of explosion, when burners are faulty and not repaired
correctly.
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