TROUBLE SHOOTING THE GAS CONTROL SYSTEM
SIT NOVA 820 MILLIVOLT VALVE
Note: Before trouble shooting the gas control system, be sure external gas shut off is in the "On" position.
WARNING: BEFORE DOING ANY GAS CONTROL SERVICE WORK, REMOVE GLASS FRONT.
SYMPTOM | POSSIBLE CAUSES | CORRECTIVE ACTION | ||
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1. Spark ignitor will not light | A. Defective or misaligned | Using a match, light pilot. If pilot lights, turn off pilot and | ||
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| electrode at pilot. | push the red button again. If pilot will not light - check gap | |
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| at electrode and | |
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| B. Defective ignitor (Push Button) | Push Piezo Ignitor Button. Check for spark at electrode and | |
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| pilot. If no spark to pilot, and electrode wire is properly | |
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| connected, replace ignitor. | |
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2. Pilot will not stay lit after | A. Defective pilot generator | 1. Check pilot flame. Must impinge on thermocouple/ |
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carefully following lighting | (thermocouple), remote wall | thermopile. Note: this pilot burner assembly utilizes both | ||
instructions. | switch. | a thermocouple and a thermopile. The thermocouple | ||
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| operates the main valve operation (On and Off). Clean | |
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| and or adjust pilot for maximum flame impingement on | |
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| thermopile and thermocouple. | |
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| B. Defective automatic valve | Turn valve knob to "Pilot". Maintain flow to pilot; millivolt | |
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| operator. | meter should read greater than 10 mV. If the reading is | |
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| okay and the pilot does not stay on, replace the gas | |
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| valve. Note: An interrupter block (not supplied) must be | |
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| used to conduct this test. | |
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3. Pilot burning, no gas to | A. Wall switch or wires | Check wall switch and wires for proper connections. Jumper | ||
burner, Valve knob "ON", | defective. | wire across terminals at wall switch, if burner comes on, | ||
Wall Switch "ON". |
| replace defective wall switch. If okay, jumper wires across | ||
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| wall switch wires at valve, if burner comes on, wires are | |
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| faulty or connections are bad. | |
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| B. Thermopile may not be | 1. Be sure wire connections from thermopile at gas valve | |
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| generating sufficient | terminals are tight and thermopile is fully inserted into pilot | |
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| millivoltage. | bracket. | |
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| 2. One of the wall switch wires may be grounded. Remove | |
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| wall switch wires from valve terminals if pilot now stays lit, | |
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| trace wall switch wiring for ground. May be grounded to | |
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| fireplace or gas supply. | |
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| 3. Check thermopile with millivolt meter. Take reading at | |
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| thermopile terminals of gas valve. Should read | |
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| millivolts (minimum 150) while holding valve knob de- | |
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| pressed in pilot position and wall switch "Off". Replace | |
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| faulty thermopile if reading is below specified minimum. | |
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| C. Plugged burner orifice. | Check burner orifices for debris and remove. | |
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| D. Defective automatic valve | Turn valve knob to "On", place wall switch to "On" millivolt | |
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| operator. | meter should read greater than 100 mV. If the reading is | |
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| okay and the burner does not come on, replace the gas | |
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| valve. | |
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4. Frequent pilot flare outage | A. Pilot flame may be too low | Clean and/or adjust pilot flame for maximum flame | ||
problem. | or blowing (high) causing the | impingement on thermopile and thermocouple. | ||
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| pilot safety to drop out. |
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| B. Vent safety shutdown. | Check the vent system for blockage. Check all connections | |
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| on vent safety switch. | |
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