Heat & Glo ATS-AU-D Installation And Operation Instructions Manual page 21

SYMPTOM
III. Pilot burning, no gas
burner, valve knob "ON",
"on-off" switch "ON".
POSSIBLE CAUSE
B. Defective valve.
A. "ON-OFF" switch or wires defec-
tive.
B. Thermopile may not be generat-
ing sufficient millivoltage.
Heat & Glo • ATS-AU-D • 327-900 Rev. D • 2/06
CORRECTIVE ACTION
3. Disconnect the thermocouple
from the valve, place one milli-
volt meter lead wire on the tip of
the thermocouple and the other
meter lead wire on the thermo-
couple copper lead. Start the
pilot and hold the valve knob in.
If the millivolt reading is less
than 15 mv, replace the thermo-
couple.
1. If thermocouple is producing
more than 15 millivolts, replace
faulty valve.
1. Check "on-off" switch and wires
for proper connections. Place
jumper wires across terminals at
switch-if burner comes on, re-
place defective switch. If OK,
place jumper wires across
switch wires at gas valve-if
burner comes on, wires are
faulty or connections are bad.
1. If the pilot flame is not close
enough physically to the thermo-
pile, adjust the pilot flame.
2. Be sure the wire connections
from the thermopile at the gas
valve terminals are tight and the
thermopile is fully inserted into
the pilot bracket.
3. Check the thermopile with a mil-
livolt meter. Take the reading at
TH-TP & TP terminals of the gas
valve. The meter should read
325 millivolts minimum, while
holding the valve knob de-
pressed in the pilot position, with
the pilot lit, and the ON/OFF
switch in the OFF position. Re-
place the faulty thermopile if the
reading is below the specified
minimum.
21