Sentry | GENERAL TROUBLESHOOTING GUIDE FOR SERVICEPEOPLE | 17 | |||
BURNERS FAIL TO OPERATE |
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CAUSE |
| REMEDY |
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1. | Safety pilot out, or flame too low. | 1. | Check, clean, |
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2. | Gas supply valve shut off. |
| 2. | Open gas valve(s). |
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3. | Electric switch open. |
| 3. | Close switch. |
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4. | Blown or defective line fuse. |
| 4. | Replace fuse. |
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5. | Operating or limit control contacts open or dirty. | 5. | Check control. Clean contacts or replace control. |
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6. | Defective gas valve or pressure regulator; or plugged | 6. | Repair or replace. |
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| bleed line. |
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7. | Defective low voltage transformer. | 7. | Replace transformer. |
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8. | Obstruction at main burner orifice. | 8. | Check, clean and reinstall. |
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9. | Break in wiring or loose contact at control terminals. | 9. | Check with |
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10. | Improper wiring. |
| 10. | Check and correct in accordance with wiring diagrams | |
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| included with appliance instructions. |
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11. | Improper controls. |
| 11. | Install proper controls. |
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12. | Rollout or blocked vent safety switch open. | 12. | Replace rollout switch (inspect flue passages prior to |
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| replacement) or reset blocked vent safety switch by |
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| depressing the reset button. |
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BURNERS WILL NOT SHUT OFF |
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CAUSE |
| REMEDY |
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1. | Defective operating control, gas valve, or high limit | 1. | Check, repair or replace. |
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| control. |
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2. | Improper wiring or short circuit. | 2. | Check wiring and controls. |
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FLASH BACK - BURNING AT ORIFICES |
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CAUSE |
| REMEDY |
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1. | Manifold gas pressure too low. | 1. | Adjust to proper manifold pressure. |
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2. | Improper primary air adjustment. | 2. | Adjust air to produce soft, clean flame. |
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3. | Gas regulator bleed too slow. | 3. | Adjust bleed opening. |
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4. | Burrs on orifice. |
| 4. | Remove burrs. |
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5. | Improperly drilled orifice plugs. | 5. | Install orifice plugs with proper drilling. |
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6. | Leaking automatic gas valve. |
| 6. | Repair or replace. |
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7. | Adverse draft condition in boiler room. | 7. | Check air supply and venting system. |
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8. | Low main gas pressure. |
| 8. | Contact utility. |
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9. | Safety pilot improperly installed. | 9. | Correct to manufacturer's recommendations. |
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DELAYED IGNITION |
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CAUSE |
| REMEDY |
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1. | Pilot flame too low. |
| 1. | Increase gas supply to pilot. |
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2. | Pilot burner ports or pilot orifice clogged. | 2. | Clean ports or orifices. |
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3. | Burners or orifices out of alignment. | 3. | Realign burners or manifold. |
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4. | Excessive primary air. |
| 4. | Adjust primary air shutters. |
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5. | Excessive burner input. |
| 5. | Check and reduce to input shown on rating plate. |
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6. | Adverse draft condition in boiler room. | 6. | Check air supply and venting system. |
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FUMES AND GAS ODORS |
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CAUSE |
| REMEDY |
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1. | Leaks in gas piping or accessories. | 1. | Locate leaks and repair. |
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2. | Gas leaks in service line or meter connections. | 2. | Close service supply valve - shut down appliance and |
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| notify utility. |
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3. | Blocked chimney. |
| 3. | Check and repair chimney. |
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4. | Boiler flueways blocked with soot. | 4. | Clean flueways and adjust burners as described in the | ||
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| installation instructions. |
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5. | Undersized breeching or too many turns in breeching. | 5. | Check manufacturer's recommendations. |
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6. | Adverse draft condition in boiler room. | 6. | Check air supply and venting system. |
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7. | Overfiring. |
| 7. | Adjust gas input to that shown on boiler rating plate. |
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CONDENSATION IN BOILER FLUES OR IN VENT SYSTEM |
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CAUSE |
| REMEDY |
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1. | Underfiring. |
| 1. | Increase firing rate to that shown on rating plate. |
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2. | Boiler water maintained at too low a temperature level. | 2. | Set low limit controls to maintain a higher water temper- | ||
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| ature. If boiler is not equipped with low limit replace |
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| with one which has a combination low limit/high limit |
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| aquastat. |
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3. | Long horizontal run of smokepipe. | 3. | Relocate boiler or insulate breeching. |
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4. | Inadequate chimney or venting system. | 4. | Check chimney and venting recommendations. |
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