17
Troubleshooting Guide
TROUBLE: BURNER DOES NOT START
SOURCE PROCEDURE CAUSES REMEDY
Thermostat Check Thermostat 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. (If equipped) overload.
Check primary control safety Primary tripped on safety. Reset safety switch.
switch.
Power Check boiler disconnect switch Switch open. Close switch.
and main disconnect switch.
Tripped breaker or blown fuse. Reset breaker or replace fuse.
Cad Cell Jump the FF terminals on
primary control, if the burner
starts, fault is in detector circuit.
Check resistance across cad cell.
Primary Check for line voltage between
Control the black and white leads. No
voltage indicates no power to the
control.
Check for line voltage between
orange and white leads. No
voltage indicates a faulty control.
Burner Check for voltage at the black
and white leads to the burner
motor. Voltage indicates power
to motor and a fault in the
burner.
Open cad cell wires.
Dirty cell face.
Faulty cad cell.
If 400-600 ohms cell is bad.
Limit control switch open
Open circuit between limit
control and disconnect switch.
Low line voltage or power
failure
Defective control.
Pump seized.
Blower wheel binding.
Burner motor defective.
Repair or replace wire.
Clean or replace face.
Replace cad cell.
Replace cad cell.
Check limit setting.
Jump terminals - if burner
starts replace control.
Repair circuit.
Call utility company.
Replace control.
Turn off power to burner.
Rotate blower by hand, check
for excessive drag. Replace
fuel unit or blower wheel.
Replace burner motor.
When checking burner adjustments always use instruments.
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