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All installations and services must be performed by qualified service personnel.
33
Is there combustion
airflow to the furnace?
Yes
Yes
Is the transformer (GMC) or
oil primary control (OMC)
supplying 24 VAC to the
thermostat?
Replace control transformer (GMC)
or try resetting the oil primary
control (OMC). Replace the oil
primary control, if necessary.
Yes
Yes
Is there 120 VAC across
the burner motor?
Is the blower impeller spinning?
If so, check for blockages in or a
collapsed air duct. Is the air boot
shutter open adequately.
Yes
Check wiring to burner motor.
If okay, replace burner motor.
Correct wire connections.
Replace thermostat.
Are the thermostat wires
connected properly?
Yes
No
No No
No
On the GMC,has 1 TDR
activated and closed the
output relay contacts?
If not, replace 1 TDR. On
OMC, is the oil primary
control receiving power?
Reset primary control. If
resetting the primary does
not work, replace control.