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Manafacture: Monessen Hearth File size: 1.49 mb File name: Language of manual:

If pilot lights, an improper gas mixture caused the bad lighting and a longer purge period is recommended. If pilot will not light – check gap at electrode and pilot – should be ..." to have a strong spark. If gap measures ...", replace pilot (Figure 9 on page 7). C. Gas supply pressure errant. Check inlet gas pressure. It should be within the limits as marked on the rating plate. D. Pilot orifice plugged. Clean or replace pilot orifice. 2. Pilot will not stay lit after carefully following the lighting instructions. A. Defective pilot generator (thermocouple). Check pilot flame, it must impinge on thermocouple (Figure 9 on page 7) Clean and/or adjust pilot for maximum flame impingement on thermocouple. Ensure that the connection between the valve and thermocouple are tight and secure. 3. Pilot burning, no gas to burner, Valve knob “ON,” Wall Switch “ON.” A. Wall switch or wires defective. Check wall switch and wires for proper connections. Jumper wire across terminals at wall switch, if burner comes on, replace defective wall switch. If okay, jumper wires across wall switch wires at valve, if burner comes on, wires are faulty or connections are bad. B. Thermopile may not be generating sufficient millivoltage. Check thermopile with millivolt meter. Take reading at thermopile terminals of gas valve. Should read 325 millivolts minimum with optional wall switch “OFF.” Replace faulty thermopile if reading is below specified minimum. C. Plugged burner orifice. Check burner orifice for stoppage and remove. 4. Frequent pilot/burner outage problem. A. Pilot flame may be too low or blowing (high) causing the pilot/ valve safety to drop out. Clean and/or adjust pilot flame for maximum flame impingement on thermocouple (Figure 9 on page 7). TROUBLESHOOTING THE ELECTRONIC IGNITION SYSTEM Note:Before troubleshooting, make sure that the appliance main line gas shut-off valve and the gas control valve are in the "OPEN" position and the burner ON/OFF switch is in the “ON” position. Important:Valve system troubleshooting should only be accomplished by a qualified service technician. SYMPTOM POSSIBLE CAUSES CORRECTIVE ACTION 1. Burner will not light. A. Faulty Valve System. See Below. B. “OFF/ON” or wall switch defective. Disconnect the two black wires from the wire nuts. Test switch(s) for continuity with a multimeter. If continuity is not indicated, switch(s) is defective and must be replaced. Note:Before replacing “OFF/ON” switch, be sure to check wiring for loose connections or broken wires and repair as needed. 2. Burners come “ON” but go “OFF.” A. Burner orifice plugged. Check main burner orifice(s) for stoppage. Clean or replace. B. Obstructed vent system. Check vent system for obstructions. • Turn Off Gas Supply • Assure Valve Switch Is In ON Position • Disconnect Control Harness • Set Thermostat To Call For Heat START • Line Voltage Power • Low Voltage Transformer • Limit Controller • Thermostat • Wiring CHECK NO • Plug Control Harness Into Valve. Wait For...

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