Heat & Glo Fireplace ST-38HV-AU - Manual (Page 29)

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III. Pilot burning, no gas burner,
valve knob "ON", "on-off"
switch "ON".
CORRECTIVE ACTION
3. Check thermopile with millivolt
meter. Take reading at “TH-
TP&TP” terminals of gas valve.
Should read 325 millivolts mini-
mum while holding valve knob
depressed in pilot position, pilot
lit, and on/off switch “OFF”. Re-
place faulty thermocouple if read-
ing is below specified minimum.
4. Disconnect thermopile leads
from the valve. With pilot burner
"ON", take reading at thermopile
leads - should read 325 millivolts
minimum. Replace thermopile if
reading is below this minimum.
1. Check wire continuity and con-
nection in pilot circuit.
1. Disconnect the thermopile's red
wire from the micro-switch and
connect to terminal "TP" on the
gas valve. Turn green knob to
pilot position, depress and light
pilot light. If meter reading is
greater than 325 m.v. after 30
seconds, the pilot generator is
good. If pilot does not stay lit,
the valve is defective. If the meter
reading is less than 325 m.v., the
thermopile is defective.
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 connec-
tions are bad.
1. Recheck Symptom #2.
2. Pilot flame not physically close
enough to thermopile.
SYMPTOM POSSIBLE CAUSE
B. Open wire connection in pilot
circuit.
C. Defective valve.
A. "ON-OFF" switch or wires de-
fective.
B. Thermopile may not be gener-
ating sufficient milli-
voltage. (325m.v.)