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Troubleshooting: Burner runs continuously (too little heat).
Source
Procedure
Causes
Correction
Too much combustion air
Reduce combustion air.
Low CO
2
less
Air leaks into heat exchanger
around inspection door, etc.
Correct cause of air leak.
Low CO
2
less
than 10%.
Excessive draft
Adjust barometric draft con-
trol for correct draft.
Incorrect burner head adjust-
ment
Correct burner head setting.
Dirty or plugged heat exchanger
Clean heat exchanger.
Hi h
k
Dirty or plugged heat exchanger
Readjust burner.
Check burner
High smoke
reading more
Insufficient draft
Increase draft.
Combustion
Check burner
combustion for
CO2, stack tem-
reading more
than a trace.
Incorrect burner head adjust-
ment
Correct burner setting.
CO2, stack tem
perature, and
smoke
Too little combustion air
Increase combustion air.
smoke
Too little blower air
Increase blower speed to
maintain proper temp. rise.
High stack tem-
Blower belt too loose (if
equipped)
Tighten blower belt.
High stack tem-
perature is
more than
Dirty or plugged heat exchanger Clean heat exchanger.
more than
550
_
F Net.
Dirty blower wheel
Clean blower wheel.
550 F Net.
Dirty furnace air filters
Clean or replace filter.
Restricted or closed registers or
dampers
Readjust registers or damp-
ers.
Oil Pressure
Inspect fire and check
Partially plugged or defective
nozzle
Replace nozzle.
Oil Pressure
Inspect fire and check
oil pressure.
Oil pressure is too low: less
than 100 psi.
Increase oil pressure top
100psi.
