TROUBLESHOOTING
WARNING: Turn off heater and let cool before servicing. Only a qualified service person should service and repair heater.
WARNING: Turn off heater and let cool before servicing. Only a qualified service person should service and repair heater.
OBSERVED PROBLEM | POSSIBLE CAUSE | REMEDY |
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Pilot will not stay lit | 1. Defective thermocouple | 1. Check pilot flame. It must |
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| impinge on thermocouple |
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| 2. Clean or adjust pilot for maxi- |
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| mum flame impingement on |
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| thermocouple |
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| 3. Ensure the connection be- |
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| tween valve and thermocouple |
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| are tight and secure |
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| 4. Check thermocouple with |
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| millivolt meter. Take reading |
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| at thermocouple terminals of |
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| gas valve with remote control |
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| off. It should read 18 millivolts |
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| minimum. Replace faulty ther- |
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| mocouple if reading is below |
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| specified minimum |
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Pilot lit but no flame on burner | 1. Remote or wires defective | 1. Check remote wires for proper |
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| connections. Place jumper |
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| wire across terminals at re- |
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| mote control. If burner comes |
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| on, replace remote. If okay, |
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| place jumper wire across |
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| remote control at valve. If |
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| burner comes on, wires are |
| 2. Thermopile not generating | faulty or connections are bad |
| 2. Check thermopile with mil- | |
| sufficient milivoltage | livolt meter. Take reading at |
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| thermopile terminals of gas |
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| valve with remote control off. |
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| It should read 325 millivolts |
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| minimum. Replace thermopile |
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| if reading is below specified |
| 3. Plugged burner orifice | minimum |
| 3. Check burner orifice for stop- | |
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| page and remove |
Frequent pilot outage | 1. Pilot flame may be too low |
| or blowing (high) causing |
| safety pilot to “drop out” |
1.Clean and/or adjust pilot flame for maximum flame impinge- ment on thermocouple
www.desatech.com | 17 |
