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If no voltage is present, make sure that the brass jumper is present between W and Z and that the screws holding this jumper in place are both tight. • If not already done, temporarily replace the thermostat across TV and T with a jumper. If the boiler fires when this is done, there is a problem with the thermostat or zone wiring. • If 24 volts is present across T and W and the relay in the L8148E does not pull in, the relay in the L8148E is probably defective. Inspect the coil of this relay for visible heat damage. If such damage is found, there is a good chance that a second transformer is present in the thermostat or zone valve circuit, resulting in the application of 48 volts across the relay coil. In older buildings, this transformer may be hidden in a location far from the boiler. If this second transformer exists, it must be found and removed before the L8148E is replaced. 7) When checking voltage across damper harness pins, be careful not to insert the meter probes into the pins. Doing so may damage the pin, resulting in a loose connection when the harness is reconnected. 29 START START Circulator start? 120 volts at L1&L2? 120 volts at C1&C2? N N Does circulator run now ? *Defective L8148E-see Note 6 on page 29. Vent damper open? 24 volts across B and R (limit sw itch) in L8148E ? *Boiler off on limit *Defective high limit. 24 volts betw een pins 1&4 (blue&yellow )and 2&4 (orange&yellow ) on damper end of damper harness? See Note 7 on page 29. Y 24 volts across T&TV? 120 volts across terminals at circulator? *Seized or defective circulator N Y N Y N Y Y Y N N Y N Y N Thermostat calls for heat *Power off *Blown fuse or tripped breaker *Misw ired or loose electrical connection in 120V line Remove t'stat or zone valve end switchwires from T&TV terminals on L8148E. Install temporary jumper across terminals T and TV. Y *Bad electrical connection betw een C1 or C2 and circulator * Loose connection betw een damper harness and L8148E *Defective damper harness. * Defective L8148E *Obstruction in path of damper blade *Defective damper motor *Loose connection betw een damper harness and damper *Loose connection in t'stat or zone valve end sw itch w iring *Defective t'stat or zone valve end sw itch *T'stat or zone system misw ired-consult t'stat or zone valve manufacturer's instructions 30 Main burners light? Y Do burner and circulator shut dow n at end of call for heat? Do burners shut dow n before gage temp exceeds high limit setting +15F? Y Y N N Main burners light? Y Do burner and circulator shut dow n at end of call for heat? Do burners shut dow n before gage temp exceeds high limit setting +15F? Y Y N N 24 volts across B1 &B2 ? N *Defective damper *Defective L8148E *Defective damper harness *Loose damper harness connection *Defective L8148A bottomed out in well END *Obstruction in path of damper blade 31 Refer to standing pilot or intermittent ignition troubleshooting chart (page 32 or 33). 24 volts across standing pilot gas valve terminals or terminals 5&6 on S8600 module? 24 volts across spill sw itch? *Chimney blockage *Chimney system not constructed in accordance w ith Parts 7 and 11 of National Fuel Gas Code. *Dow n draft *Inadequate combustion air supply in boiler room Y Y 24 volts across rollout sw itch? *Loose electrical connection in 24 volt w iring betw een B1 or B2 and gas valve or module Y *Rollout sw itch open. Replace w ith exact replacement (see parts list). Check for blocked heat exchanger. N N Y N Pull w ire off of T terminal on aquastat. Does boiler shut dow n? *Sensing bulb not Y N *T'stat or zone valve w iring calling for heat *T'stat w ires shorted *Internal boiler wiring problem, consult Crown representative Standing Pilot Ignition System Troubleshooting Chart Standing Pilot Ignition System Troubleshooting Chart T (24 VOLTS PRESENT ACROSS TH AND TR ON GAS VALVE, BUT MAIN BURNERS DO Caution: Read page 29 before attempting to use this chart Pilot lit? Y N button for at least one minute. Does pilot light? Line pressure within the range indicated on boiler's rating plate? N Y *Pilot tubing blocked, kinked or leaking *Pilot orifice blocked *Gas line not purged of air *Pilot improperly adjusted. NOT LIGHT) Main burners light? Does pilot stay lit? Y Turn control on gas valve to PILOT.Depress red button and light pilot. Hold Turn control on gas valve to ON. Ensure knob on gas valve is set to ON N Y N *Defective gas valve Y Y Does pilot stay lit when red button is released? N Is voltage at least 18mV? *Defective thermocouple *Pilot improperly adjusted *Pilot tube blocked, kinked, or leaking *Pilot orifice partially plugged Disconnect thermocouple from gas valve. Connect a volt meter to the thermocouple. Light thepilot andhold down the red button while reading the voltage across the thermocouple. *Loose or defective thermocouple connection at gas valve *Defective gas valve END *Loose thermocouple connection at gas valve. *Defective thermocouple. *Condensation quenching pilot. *Low line pressu...

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