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/ | ||
| 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. |
| 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 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. Possible blockage of the vent | Check the vent terminal for blockage (recycling the flue gases) |
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| terminal. |
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