NV360/580 Series
Troubleshooting
SIT NOVA 820 MILLIVOLT VALVE
NOTE: Before troubleshooting 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 | |
1. | Spark ignitor will not light. | A. Defective or misaligned elec- | Using a match, light pilot. If pilot lights, turn off pilot and | |
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| trode at pilot. | push the red button again. If pilot will not light - check gap |
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| at electrode and pilot |
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| spark. |
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| B. Defective ignitor (push button) | Push piezo ignitor button. Check for spark at electrode |
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| and pilot. If no spark to pilot, and electrode wire is prop- |
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| erly connected, replace ignitor. |
2. Pilot will not stay lit after | A. Defective pilot generator (ther- | Check pilot flame. Must impinge on thermocouple/ther- | ||
| carefully following lighting | mocouple), remote wall switch. | mopile. NOTE: This pilot burner assembly utilizes both - a | |
| instructions. |
| thermocouple and a thermopile. The thermocouple oper- | |
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| ates the main valve operation ("ON" and "OFF"). Clean |
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| and/or adjust maximum flame impingement on thermopile |
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| and thermocouple. |
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| B. Defective automatic valve. | Turn valve knob to "PILOT". Maintain flow to pilot; millivolt |
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| meter should read greater than 10 mV. If the reading |
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| is 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. |
3. Pilot burning, no gas to | A. Wall switch or wires defective. | Check wall switch and wires for proper connections. | ||
| main burner. |
| Jumper wire across terminals at wall switch, if burner | |
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| comes on, replace defective wall switch. If okay, jumper |
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| wires across wall switch wires at valve. If burner comes |
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| on, wires are faulty or connections are bad. |
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| B. Thermopile may not be gener- | 1. Be sure wire connections from thermopile at gas valve |
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| ating sufficient millivoltage. | terminals are tight and thermopile is fully inserted into |
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| pilot bracket. |
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| 2. One of the wall switch wires may be grounded. |
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| Remove wall switch wires form valve terminals if pilot |
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| now stays lit, trace wall switch wiring for ground. May |
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| be grounded to 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 250- |
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| 300 millivolts (minimum 150) while holding valve knob |
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| depressed in pilot position and wall switch "OFF". |
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| Replace faulty thermopile if reading is below specified |
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| minimum. |
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| C. Plugged burner orifice. | Check burner orifices for debris and remove. |
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| D. Defective automatic valve op- | Turn valve knob to "ON", place wall switch to "ON". Milli- |
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| erator. | volt meter should read greater than 100 mV. If the reading |
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| is okay and the burner does not come on, replace the gas |
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| valve. |
4. | Frequent pilot outage | A. Pilot flame may be too low or | Clean and/or adjust pilot flame for maximum flame im- | |
| problem. | blowing (high) causing the pilot | pingement on thermopile and thermocouple. | |
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| safety to drop out. |
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| B. Possible blockage of the vent | Check the vent terminal for blockage (recycling the flue |
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| terminal. | gases). |
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20003565 | 17 |
