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* Defective damper * Defective or loose damper harness * Obstruction in path of damper blade 24 volts across standing pilot gas valve terminals or terminals 5&6 on S8600 module? 24 volts across spill switch? *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 Y N Y 24 volts across rollout switch? *Rollout switch open. Replace with exact Y N N YN Do burners shut down when water level drops below cut-off point? END *Grounded probe or probe lead * Defective L.W.C.O. DO NOT OPERATE BOILER UNTIL THIS PROBLEM IS CORRECTED Do burners shut down when pressure exceeds limit setting? * Defective pressure limit control * Blockage in siphon tube Y Y N N N Y 24 volts across 1&4 (blue&yellow) and 2&4 (orange&yellow ) on damper end of harness? N Y Main burners light? 24 volts across red damper lead and yellow transformer lead? * Refer to standing pilot or intermittent ignition troubleshooting chart (page 39 or 40). * Defective damper * Defective or loose damper harness * Obstruction in path of damper blade 24 volts across standing pilot gas valve terminals or terminals 5&6 on S8600 module? 24 volts across spill switch? *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 Y N Y 24 volts across rollout switch? *Rollout switch open. Replace with exact Y N N YN Do burners shut down when water level drops below cut-off point? END *Grounded probe or probe lead * Defective L.W.C.O. DO NOT OPERATE BOILER UNTIL THIS PROBLEM IS CORRECTED Do burners shut down when pressure exceeds limit setting? * Defective pressure limit control * Blockage in siphon tube Y Y N N N Y replacement (see parts list). Check for blocked heat exchanger. * Defective or loose damper harness * Defective damper motor *Obstruction in path of damper blade *Loose electrical connection in spill switch or rollout switch wiring or gas valve common * Defective or loose damper harness 36 * Defective transformer See Note #6 on page 34 * Defective transformer See Note #6 on page 34 Troubleshooting Chart for BSI Boilers Equipped with McDonnell & Miller #67 Low Water Cut-offs and Vent Dampers Caution: Read page 34 before attempting to use this chart Is there an audible click as R8225 relay pulls in w hen the thermostat calls for heat? Vent damper open? START Thermostat calls for heat 24 volts across blue and yellow w ires inside junction box? 120 volts across black and w hite transformer leads? *Pow er off *Blow n fuse or tripped breaker *Misw ired or loose 120 volt connection N Y N Y N 24 volts betw een terminal # 1 on 67 LWCO and yellow tranformer connection? 24 volts present betw een each pressure limit connection and yellow transformer connection? * Boiler off on pressure limit * Defective pressure limit Is 24 volts present across brow n and yellow leads on R8225 relay? * Boiler off on low water Y Y N N Y Y N N Y Does relay pull in now ? N Disconnect thermostat and temporarily jump boiler thermostat connections together * Defective R8225 See Note #7 on page 34 Y 37 24 volts present across blue lead on R8225 and yellow transformer leads? Y N * Bad connection in thermostat w iring * Defective thermostat * Thermostat misw ired or misapplied * Loose connection betw een transformer and R8225 coil * Defective R8225 24 volts across 1&4 (blue&yellow) and 2&4 (orange&yellow ) on damper end of harness? N Y Main burners light? 24 volts across red damper lead and yellow transformer lead? * Refer to standing pilot or intermittent ignition troubleshooting chart (page 39 or 40). * Defective damper * Defective or loose damper harness * Obstruction in path of damper blade 24 volts across standing pilot gas valve terminals or terminals 5&6 on S8600 module? 24 volts across spill switch? *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 Y N Y 24 volts across rollout switch? *Rollout switch open. Replace with exact Y N N YN Do burners shut down when water level drops below cut-off point? END *LWCO float bowl filled with mud * Defective LWCO DO NOT OPERATE BOILER UNTIL THIS PROBLEM IS CORRECTED Do burners shut down when pressure exceeds limit setting? * Defective pressure limit control * Blockage in siphon tube Y Y N N N Y 24 volts across 1&4 (blue&yellow) and 2&4 (orange&yellow ) on damper end of harness? N Y Main burners light? 24 volts across red damper lead and yellow transformer lead? * Refer to standing pilot or intermittent ignition troubleshooting chart (page 39 or 40). * Defective damper * Defective or loose damper harness * Obstruction in path of damper blade 24 volts across standing pilot gas valve terminals or terminals 5&6 on S8600 module? 24 volts across spill switch? *Chimney blockage *Chimney system not contructed in acc...

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