HearthStone Quality Home Heating Products Inc
STOWE Gas-Fired Direct Vent heater
36
TROUBLESHOOTING (cont.)
Symptom
Possible Cause
Corrective Action
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.
A. Thermostat switch or
wires defective.
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. Thermopile may not be
generating sufficient voltage.
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. Plugged burner orifice.
C. Remove and check burner orifice, clean or
replace. Note: do not use any metal cleaning
device, as this may damage the orifice.
4. Pilot and burner
come on, but go
out after some
warm-up.
A. Inconsistent, of
insufficient flame on
thermopile.
A. Adjust pilot flame size and assure that the
flame is aimed directly at the thermopile.
B. Insufficient gas pressure. B. Check line pressure to ensure that the
correct inlet pressure is present for the type
of gas being used. If propane pressure is
inconsistent, check for water condensation at
the regulator.
5. Frequent pilot
outrage problem.
A. Pilot flame may be too
low or blowing, (high),
causing the pilot safety to
drop out.
A. Clean and/or adjust the pilot flame for
maximum impingement on the thermopile
and thermocouple.
6. Glass fogs
A. A normal result of gas
combustion.
A. After the heater has warmed up, the glass
should clear.
7. Blue Flames
A. A normal result during the
first 20 minutes.
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.
