TROUBLESHOOTING
Note: Before troubleshooting the gas control system, Ensure external gas shut off valve, located at gas supply inlet, (and wall switch, iff applicable), is
in the “ON” position. Important: Valve system troubleshooting should only be accomplished by a qualified service technician.
| TROUBLESHOOTING GUIDE - MILLIVOLT GAS CONTROL SYSTEM | ||
| SYMPTOM | POSSIBLE CAUSES | CORRECTIVE ACTION |
1. | Spark Igniter will not light pilot after | A. Defective igniter | Check for spark at electrode and pilot; if no spark |
| repeated triggering of Igniter button. | (no spark at electrode). | and electrode wire is properly connected, replace |
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| Igniter. |
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| B. Defective or misaligned electrode at pilot | Using a match, light pilot. If pilot lights, turn off pilot |
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| (spark at electrode). | and trigger the igniter button again. If pilot lights, an |
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| improper gas mixture caused the bad lighting and |
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| a longer purge period is recommended. If pilot will |
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| not light – check gap at electrode and pilot – should |
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| be 1/8" to have a strong spark. If gap measures 1/8", |
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| replace pilot (see Figure 8 on Page 8). |
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| C. Gas supply pressure errant. | Check inlet gas pressure. It should be within the limits |
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| as marked on the rating plate. |
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| D. Pilot orifice plugged. | Clean or replace pilot orifice. |
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2. | Pilot will not stay lit after | A. Defective pilot generator | Check pilot flame, it must impinge on thermocouple |
| carefully following the lighting | (thermocouple). | (see Figure 8 on Page 8). Clean and/or adjust pilot |
| instructions. |
| for maximum flame impingement on thermocouple. |
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| Ensure that the connection between the valve and | |
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| thermocouple are tight and secure. |
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3. | Pilot burning, no gas to burner, Valve | A. Limit Switch defective. | Isolate the “limit” switch. Disconnect the wires from |
| knob “ON,” Wall Switch “ON.” |
| the “ON/OFF” switch and the valve (label wires for |
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| reattachment). Test for continuity with a multimeter. |
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| If continuity is not indicated, switch is defective and |
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| must be replaced. |
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| B. Wall switch or wires defective. | Check wall switch and wires for proper connections. |
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| 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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| C. Thermopile may not be generating suf- | Check thermopile with millivolt meter. Take reading |
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| ficient millivoltage. | at thermopile terminals of gas valve. Should read |
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| 325 millivolts minimum with optional wall switch |
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| “OFF.” Replace faulty thermopile if reading is below |
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| specified minimum. |
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| D. Plugged burner orifice. | Check burner orifice for stoppage and remove. |
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4. | Frequent pilot/burner outage prob- | A. Pilot flame may be too low or blowing (high) | Clean and/or adjust pilot flame for maximum flame |
| lem. | causing the pilot/valve safety to drop out. | impingement on thermocouple (see Figures 8 on |
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| Page 8). |
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| TROUBLESHOOTING GUIDE - ELECTRONIC IGNITION SYSTEM | ||||||
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| SYMPTOM |
| POSSIBLE CAUSES |
| CORRECTIVE ACTION |
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1. | Burner will not light. | A. Faulty Valve System. |
| See Below. |
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| B. “OFF/ON” or wall switch defective. |
| Disconnect the two black wires from the wire nuts. |
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| Test switch(s) for continuity with a multimeter. If |
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| continuity is not indicated, switch(s) is defective and |
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| must be replaced. |
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| Note: Before replacing “OFF/ON” switch, Ensure to |
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| check wiring for loose connections or broken wires |
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| and repair as needed. |
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2. | Burners come “ON,” then turns “OFF.” | A. Burner orifice plugged. |
| Check main burner orifice(s) for blockage. Clean |
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| or replace. |
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| B. Obstructed vent system. |
| Check vent system for obstructions. |
| 23 | |
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| NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE. |
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