CDV Series Direct Vent Gas Fireplace
Troubleshooting 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 |
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| electrode at pilot. | pilot and push the red button again. If pilot will not |
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| light - check gap at electrode and |
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| 1/8” to have a strong spark. |
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| B. Defective ignitor (Push Button) | Push Piezo Ignitor Button. Check for spark at |
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| electrode and pilot. If no spark to pilot, and elec |
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| trode wire is properly connected, replace ignitor. |
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| 2. Pilot will not stay lit after | A. Defective pilot generator | Check pilot flame. Must impinge on thermo |
| carefully following lighting | (thermocouple), remote wall | couple/thermopile. Note: this pilot burner assem |
| instructions. | switch. | bly utilizes |
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| The thermocouple operates the main valve |
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| operation (On and Off). Clean and or adjust pilot for |
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| maximum flame impingement on thermopile and |
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| thermocouple. |
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| B. Defective automatic valve | Turn valve knob to “Pilot”. Maintain flow to pilot; |
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| milivolt meter should read greater than 10 mV. If |
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| the reading is okay and the pilot does not stay on, |
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| replace the gas valve. Note: An interrupter block |
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| (not supplied) must be used to conduct this test. |
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| 3. Pilot burning, no gas to | A. Wall switch or wires defective | Check wall switch and wires for proper connec |
| main burner |
| tions. Jumper wire accross terminals at wall |
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| switch, if burner comes on, replace defective wall |
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| switch. If okay, jumper wires across wall switch |
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| wires at valve, if burner comes on, wires are faulty |
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| or connections are bad. |
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| B. Thermopile may not be | 1. Be sure wire connections from thermopile at |
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| generating sufficient | gas valve terminals are tight and thermopile is fully |
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| millivoltage. | inserted into pilot bracket. |
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| 2. One of the wall switch wires may be grounded. |
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| Remove wall switch wires from valve terminals if |
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| pilot now stays lit, trace wall switch wiring for |
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| ground. May be grounded to fireplace or gas |
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| supply. |
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| 3. Check thermopile with millivolt meter. Take |
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| reading at thermopile terminals of gas valve. |
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| Should read |
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| while holding valve knob depressed in pilot |
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| position and wall switch “Off”. Replace faulty |
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| 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” |
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| operator. | millivolt meter should read greater than 100 mV. If |
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| the reading is okay and the burner does not come |
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| on, replace the gas 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 |
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| terminal. | flue gases) |
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32 | 20010175 |
