Main | Y |
burners |
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light? |
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N |
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Do burners |
| Do burners shut |
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shut down when | Y | Y |
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down when water |
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pressure |
| level drops below |
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exceeds limit |
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setting? |
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24 volts across red damper lead and yellow transformer lead?
Y
24 volts across standing pilot gas valve terminals or terminals 5&6 on S8600 module?
N* Defective damper 
* Defective or loose
damper harness
*Obstruction in path of damper blade
*Refer to standing pilot
Yor intermittent ignition 
troubleshooting chart
(page 39 or 40).
*Defective pressure limit control
*Blockage in siphon tube
*LWCO float bowl filled with mud
* Defective LWCO
DO NOT OPERATE BOILER UNTIL THIS PROBLEM IS CORRECTED
N
24 volts across 1&4
(blue&yellow) and 2&4 (orange&yellow ) on
damper end ofY harness?
24 volts | Y |
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across spill |
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switch? |
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| N |
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24volts
across rollout
switch? Y
*Chimney blockage *Chimney system not contructed in accordance with Parts 7 and 10 of National Fuel Gas Code . *Down draft *Inadequate combustion air supply in boiler room
*Defective or loose damper harness
N
*Defective or loose damper harness
*Defective damper motor
*Obstruction in path of damper blade
N
*Loose electrical connection in spill switch or rollout switch wiring or gas valve common
*Rollout switch open. Replace with exact 
replacement (see parts list). Check for blocked heat exchanger.
39
38