Thermo Pride GMC-85 Installation And Service Manual page 34

All installations and services must be performed by qualified service personnel.
Yes
Is there combustion
airflow to the furnace?
Yes
Are the thermostat wires
connected properly?
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.
No
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.
Check wiring to burner motor.
If okay, replace burner motor.
No
Yes
Yes
No
No
Yes
Yes
33
Correct wire connections.
Replace thermostat.
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.