HearthStone Quality Home Heating Products Inc
STOWE Gas-Fired Direct Vent heater
35
TROUBLESHOOTING
Symptom
Possible Cause
Corrective Action
1. Pilot will not
light.
A. Insufficient gas pressure,
air in the pilot line, or dirty or
kinked gas line.
A. Using the piezo sparker, try to light the
pilot. If it will not light, check the inlet gas
pressure.
B. Pilot orifice plugged.
B. Clean or replace the pilot assembly.
C. Defective or misaligned
electrode at pilot.
C. If a match lights a pilot, check the
electrode gap and location. Should be a 1/8"
gap in the flame area.
D. Defective ignitor.
D. Check for a good connection between
ignitor and electrode. Check wire insulation.
If properly connected and no spark, replace
ignitor.
E. After sitting for "off"
season (summer), pilot
assembly may be dirty.
E. Clean or replace the pilot assembly.
2. Pilot will not stay
lit after carefully
following lighting
instructions.
A. Low or too high gas
pressure
A. Check for proper inlet pressure for the gas
being used.
B. Faulty connections.
B. Measure voltage between valve body and
solder connection on the rear of the valve
(where the blue wire connects). It should be
no less than 7 mV.
C. Defective thermocouple.
C1. Ensure that the thermocouple connection
at the gas valve is tight.
C2. Check thermocouple output using milli-
volt meter. Disconnect from valve and read
voltage across wire ends. If the reading is
less than 14 mV, replace the pilot assembly.
C3. If burning NG, check pilot flame to see
that it is impinging on the top of the
thermocouple. Clean or replace pilot for
maximum flame impingement.
D. Pilot dirty or plugged.
D. Clean or replace the pilot assembly.
