HearthStone Sterling-Ht 8532 Owner's Manual & Installation Manual page 28

Symptom
3. Pilot burning, no gas to
main burner, valve knob in
the "ON" position,
thermostat and/or
on/off/t'stat switch in the
"ON" position.
4. Pilot and burner come
on, but go out after some
warm-up.
5. Frequent pilot outage
problem.
6. Glass fogs
7. Blue Flames
Possible Cause
A. Thermostat switch or
wires defective.
B. Thermopile may not be
generating sufficient
voltage.
C. Plugged burner orifice.
A. Inconsistent, of
insufficient flame on
thermopile.
B. Insufficient gas pressure. B. Check line pressure to ensure that the correct inlet
A. Pilot flame may be too
low or blowing, (high),
causing the pilot safety to
drop out.
A. A normal result of gas
combustion.
A. A normal result during
the first 20 minutes.
Corrective Action
A. Check thermostat/wiring for proper connections. Place
jumper wire across terminals at thermostat. If burner
comes on, replace defective thermostat. If not OK, place
jumper across thermostat wires at gas valve. If burner
comes on, tighten connections, or replace faulty wires.
B. Check thermopile output, using a milli-volt meter. If the
optional on/off kit has not been installed, take the readings
across generator terminals of the gas valve. TPTH and
TP). With the on/off kit, take the readings across TH and
Terminal block (which corresponds to #3 on the switch).
Milli-volt reading should be greater than 325 mV. If not,
replace the pilot assembly. If the meter reading is OK, but
the burner does not come on, replace the gas valve.
C. Remove and check burner orifice, clean or replace.
Note: do not use any metal cleaning device, as this may
damage the orifice.
A. Adjust pilot flame size and assure that the flame is
aimed directly at the thermopile.
pressure is present for the type of gas being used. If
propane pressure is inconsistent, check for water
condensation at the regulator.
A. Clean and/or adjust the pilot flame for maximum
impingement on the thermopile and thermocouple.
A. After the heater has warmed up, the glass should clear.
A. Flames should begin to turn more yellowish after 20
minutes of burning.
B. If the blue color stays; adjust the air shutter for a proper
burn.
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