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

3.6 TROUBLESHOOTING

With proper installation and maintenance, your new Gas Heater should provide years of trouble-free service. If you do experience a
problem, refer to the Trouble Shooting Guide below. This guide will assist a qualifi ed service person in the diagnosis of problems and
the corrective action to be taken.
Electronic Ignition System
Symptom
1. Spark Ignitor will not light pi-
lot after repeated triggering of
red button.
2. Pilot will not stay lit after
carefully following lighting
instructions.
3. Pilot burning, no gas burner,
valve knob "ON", "on-off"
switch "ON".
4. Frequent pilot outage prob-
lem.
20
Possible Causes
a. Defective ignitor (no spark at
electrode).
b. Defective pilot.
c. No gas or low gas pressure.
d. No L.P. in tank.
a. Defective thermocouple.
b. Defective valve.
a. ON-OFF" switch or wires
defective.
b. Thermopile may not be gener-
ating suffi cient millivoltage.
c. Defective valve.
d. Plugged burner orifi ce.
e. Wall switch, or wires defective.
a. Pilot fl ame may be too high
or too low, or blowing (high),
causing pilot safety to drop out.
Heat & Glo • ATS-AU-D • 327-900 Rev. F • 6/09
Corrective Actions
Check for spark at electrode and pilot; if no spark and electrode wire is
properly connected, replace ignitor.
Using a match, light pilot. If pilot lights, turn off pilot and trigger the red
button again. If pilot lights, an improper gas/air mixture caused the bad
lighting and a longer purge period is recommended.
Check unit's shut-off valve and remote shut-off valves from heater. Usually
there is a valve near the main. There can be more than one (1) valve
between the heater and main.
Low pressure can be caused by a variety of situations such as a bent line,
too narrow diameter of pipe or even low line pressure. Check for kinked
lines. If none, consult with plumber or gas supplier.
Check L.P. (propane) tank. Refi ll the fuel tank.
Check that pilot fl ame impinges on thermocouple. Clean and/ or adjust
pilot for maximum fl ame impingement.
Ensure that the thermocouple connection at the gas valve is fully inserted
and tight (hand tight plus 1/4 turn).
Disconnect the thermocouple from the valve, place one millivolt meter lead
wire on the tip of the thermocouple and the other meter lead wire on the
thermocouple copper lead. Start the pilot and hold the valve knob in. If the
millivolt reading is less than 15 mv, replace the thermocouple.
If thermocouple is producing more than 15 millivolts, replace faulty valve.
Check "on-off" switch and wires for proper connections. Place jumper wires
across terminals at switch-if burner comes on, replace defective switch. If
OK, place jumper wires across switch wires at gas valve-if burner comes
on, wires are faulty or connections are bad.
If the pilot fl ame is not close enough physically to the thermopile, adjust
the pilot fl ame.
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.
Check the thermopile with a millivolt 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 depressed in the pilot position,
with the pilot lit, and the ON/OFF switch in the OFF position. Replace the
faulty thermopile if the reading is below the specifi ed minimum.
With the pilot in the ON position, disconnect the thermopile leads from
the valve. Take a reading at the thermopile leads. The reading should be
325 millivolts minimum. Replace the thermopile if the reading is below the
minimum.
Turn valve knob to "ON". Place ON/OFF switch to "ON". Check with
millivolt meter at thermopile terminals. Millivolt meter should read greater
than 100 m.v. If the reading is okay and the burner does not come on,
replace the gas valve.
Check burner orifi ce for stoppage and remove.
Follow corrective action in A.1 above; check switch and wiring. Replace
where defective.
Clean and adjust pilot fl ame for maximum fl ame impingement on the
thermocouple. Follow lighting instruction carefully.
ATS-AU-D