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Troubleshooting Guide
TROUBLE: BURNER DOES NOT START
SOURCE PROCEDURE CAUSE REMEDY
Thermostat
Check thermostat settings Thermostat set too low. Turn thermostat up.
Thermostat on “off or “cool”. Switch to heat.
Open thermostat wires. Repair or replace wires.
Loose thermostat connectors. Tighten connection.
Faulty thermostat. Replace thermostat.
Thermostat not level. Level thermostat.
Circuit
Check burner motor overload Burner motor tripped on Push reset button.
Overloads
switch overload.
Check primary control safety Primary tripped on safety. Reset safety switch.
switch.
Power
Check furnace disconnect Switch open. Close switch.
switch and main disconnect
switch. Tripped breaker or blown fuse. Reset breaker or replace fuse.
Cad Cell
Jump the FF terminals on Open cad cell wires. Repair or replace wires.
primary control. If the
burner starts, fault is in Dirty cell face. Clean face.
detector circuit. Faulty cad cell. Replace cad cell.
Primary
Check for line voltage between Limit control switch open. Check limit setting (200˚).
Control
the black and white leads. No
voltage indicates no power to Jump terminals - if burner
the control. starts replace control.
Open circuit between limit Repair circuit.
control and disconnect switch.
Low line voltage or power Call utility company.
failure.
Check for line voltage between Defective control. Replace control.
orange and white leads. No
voltage indicates a faulty control.
Burner
Check for voltage at the black Pump seized. Turn off power to burner.
and white leads to the burner Blower wheel binding. Rotate blower by hand.
motor. Voltage indicates Check for excessive drag.
power to motor and a fault Replace fuel unit or blower
in the burner. wheel.
Burner motor defective. Replace burner motor.
