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Version 1.0b
28
TROUBLESHOOTING INSTRUCTIONS
PROBLEM POSSIBLE CAUSE SOLUTION
Air in gas lines Refer to Item #1 of the Set-Up Guide.
Defective spill switch. Check for continuity across spill switch leads. Replace spill switch if
excessive resistance is present or if circuit is electrically open.
Wrong Inlet Pressure. Refer to Item #2 of the Set-Up Guide.
Defective piezo spark
electrode.
Replace electrode if the insulator is cracked or the tip is corroded. Verify that
the spark gap between the pilot and the electrode is correct.
Defective piezo wire. Replace piezoelectric igniter if its wire insulation is damaged or the wire is
broken or corroded.
Pilot will not
light.
Safety interlock function
engaged.
Allow the thermocouple to cool until the mV drops below the hold-in
requirements of the safety magnet, (30 seconds or less). Re-light pilot.
Wrong inlet pressure Refer to Item #2 of the Set-Up Guide.
Pilot adjustment screw not
adjusted properly.
Refer to Item #7 in the Set-Up Guide.
Thermocouple or thermopile
not properly inserted into
the pilot housing.
Refer to Item #3 in the Set-Up Guide.
Thermocouple or thermopile
has film build-up on tip.
With the thermocouple and thermopile tips cool, clean the upper 3/8” with a
very fine emery cloth.
Electrical resistance too
high.
Using a very fine emery cloth, clean thermopile and thermocouple
connections at valve. Tighten thermocouple into valve hand tight, plus ¼ turn
with a wrench.
Defective thermocouple.
(mV Plus systems)
Verify that thermocouple is not kinked or damaged. Check open circuit
voltage of thermocouple. Voltage should be between 18mV and 28mv. If
voltage is less than 14mV, replace thermocouple.
Defective thermopile.
(Millivolt system)
Refer to Item #7 in the Set-Up Guide.
Defective safety magnet.
(mV Plus systems)
Verify operation of safety magnet in the following manner.
Depress and hold pilot button.
Verify open-circuit thermocouple voltage as described in previous step.
Reconnect thermocouple to valve.
Measure the voltage between the solder button on the base of the safety
magnet, and the valve body. If the mV reading is above 6mV for vented
appliances, or 8.5mV for un-vented appliances and the safety magnet does not
hold, replace the valve.
If closed circuit mV reading is the same as the open circuit reading, the coil is
electrically open. Replace the valve.
Defective Safety Magnet
(Millivolt system)
Verify operation of safety magnet in the following manner.
Remove all wires from the terminals of the main operator.
Measure the electrical voltage between the terminals TPTH and TP. If the
voltage is above 110mV and the safety magnet does not hold, replace the
valve.
Pilot will not
hold.
Pilot orifice blocked. Replace orifice with a new orifice of the exact size and type.
Wrong pilot orifice installed
in pilot light.
Replace the orifice with a new orifice supplied specifically for the appliance
and gas type in question.
Pilot light
drops out.
Spill switch activated. Examine the venting system. Repair as necessary.