INSTALLATION AND OPERATION INSTRUCTIONS
5-8
DC SERIES BOILERS / WATER HEATERS
DC 15-95, DC 15-96, DC 20-125, DC 33-160
5.4.1 Burner Does Not Ignite
POSSIBLE CAUSES
SOLUTION
Gas valve is closed.
Open gas valve.
Air in gas line.
Remove air form gas line.
Gas supply pressure too low.
Contact the gas supply company.
No ignition.
Replace ignition electrode.
No spark. Ignition module on gas valve faulty.
Check the cabling. Check the ignitor cap. Replace the ignition module.
Gas/air adjustment not correctly set.
Check adjustment. See gas/air adjustment.
Fan faulty.
Check the wiring. Check the fuse (3.15A), if necessary, replace the fan.
Fan dirty.
Clean the fan.
Gas valve faulty.
Replace the gas valve. Re-adjust the gas valve, see gas/air adjustment
5.4.2 Burner Ignites Noisily
POSSIBLE CAUSES
SOLUTION
Gas supply pressure too high.
Gas pressure regulator may be faulty. Replace the regulator or contact the
gas company.
Incorrect ignition gap.
•
Replace the ignitor.
•
Check the ignitor gap (3/16” / 4.5mm).
Gas/air adjustment not correctly set.
Check the setting. See gas/air adjustment.
Weak spark.
•
Check the ignition spark gap.
•
Replace the ignitor.
•
Replace the ignition module on the gas valve.
5.4.3 Burner Resonating
POSSIBLE CAUSES
SOLUTION
Gas supply pressure too low.
Gas pressure regulator may be faulty. Replace the regulator or contact the
gas company.
Recirculation of combustion gasses.
Check combustion air supply and flue gas exhaust piping and terminations,
possible flue gas recirculation in the system.
Gas/air adjustment not correctly set.
Check the setting, see gas/air adjustment.
5.4.4 The Power is Reduced
POSSIBLE CAUSES
SOLUTION
At high rpm the power has fallen by more than
5%.
•
Check appliance and flue system for fouling.
•
Clean the appliance and flue system
5.4 OTHER FAULTS
