15
FAULT FINDING (cont’)
Pilot burner will not light or stay lit.
High limit thermostat operates.
Are the thermocouple/Interrupter
connections secure.
Check supply.
Yes.
Is there gas at the pilot when
holding control knob in the
pilot position.
No.
Tighten connection.
No
Yes.
Very little.
Check overtemperature
stat for open circuit.
If all of the above are OK the
control valve may be faulty.
Check pilot jet for
blockage and clean where
necessary.
Check supply.
Check thermocouple
voltage (minium 15mV).
Is the oil temperature over 220
o
C.
Replace control
stat.
Yes.
Does the control stat
operate on temp. rise when
set point is low (100
o
C).
No.
Replace
overtemperature stat.
No
Yes.
Are the connections
correct on the gas
control.
Manually reset overtemp
stat.
No.
Yes.
Correct
connections.
Replace
overtemperature
stat.
