Defective
thermostat
or
thermostat wiring.
(A) With the pilot adjusted properly,
(Set-up section, step#7), place a jumper
wire between TPTH and TH. Take a mV
reading across the TPTH and TP
terminals on the valve. This closed
circuit voltage should not fall below
300mV. Record reading.
(B) Remove jumper wire from the TPTH
and TH connections, and reconnect the
thermostat wires to the same terminals.
Take the closed circuit voltage as
described in the previous step. If the mV
reading drops below 150mV, excessive
resistance exists in the thermostat circuit,
and must be isolated and eliminated.
Defective wall switch
Repeat the above troubleshooting items
covered under “Defective thermostat or
thermostat wiring”, except substitute the
words “wall switch” where the word
“thermostat” appears in the instructions.
Excessive wire
resistance
Make certain that all mV connections are
made using wire of the proper size.
Valve wired wrong. Thermo-generator leads must be
connected to the TPTH and TP
connections of the main operator.
Thermostat wires must be connected to
the TPTH, and TH terminals of the valve.
Main burner
lights in the
PILOT position
Main operator coil
Defective
Verify electrical resistance of main
operator coil in the following manner.
(A) Remove all wires from operator head.
(B)With an Ohm meter, measure
electrical resistance between TPand TH
terminals. If the resistance does not fall
within specification, replace valve.
Debris on seat of main
valve.
Replace valve.
Main seat blown out as
a result of exposing
LPG gas valve to
unregulated line
pressure in excess of
15PSI
Replace valve.