Kettle Gas Safety Valve, Kettle Temperature Control, and Kettle Thermopile Diagnosis
6
3A1320L
Kettle Gas Safety Valve,
Kettle Temperature Control, and
Kettle Thermopile Diagnosis
The gas safety valve, temperature control and thermo-
pile can be checked by using a millivolt meter. Before
checking, make certain all electrical connections are
clean and tight.
Connect millivolt meter to appropriate terminals (see
Terminal Connections
).
TH
TP
TH
TP
1
2
3
ti14524c
Terminal Connections
Step
Part(s) to Be
Checked
Terminal
Connections
Status of
Temperature
Control
Contacts
Desired
Meter
Reading
Diagnosis
1
Gas safety
valve
2 and 3
Closed
Greater than
100 mV
If mV reading > 100 mV and the automatic valve (main
burners) does not come on, replace the gas safety valve.
If mV reading < 100mV, proceed with diagnostic steps 2
and 3.
2
Temperature
control
1 and 2
Closed
Less than
80 mV
If reading > 80 mV:
•
Clean and tighten electrical connections at tempera-
ture control and gas safety valve.
•
Check valve to make sure wires are in good condi-
tion. Replace as required.
•
Rapidly change temperature setting on temperature
control to see if cycling cleans the contacts.
If the preceding fails to give mV reading < 80 mV, replace
temperature control.
3
Gas safety
valve magnet
and
thermopile
1 and 2
Open
Greater than
325 mV
If mV reading < 325 mV:
•
Clean and tighten all electrical connections.
•
Adjust pilot burner to increase millivolt output (see
page 18).
If the preceding fails to give mV reading > 325 mV,
replace thermopile.
Check valve magnet after obtaining correct mV output for
thermopile:
•
Ignite pilot burner only and allow the mV reading to
stabilize.
•
Shut pilot burner (turn gas safety valve knob OFF).
Note the mV reading where magnet drops out.
If magnet unlocks at mV reading < 120 mV, the magnet is
OK.
NOTE:
When magnet unlocks a click can be heard
and mV reading may fluctuate slightly.
