Trouble Shooting - Columbia LV Series Installation, Operation & Maintenance Manual

Troubleshooting Guide
TROUBLE: BURNER DOES NOT START
SOURCE PROCEDURE
Thermostat Check Thermostat
Circuit Check burner motor overload
Overloads switch. (If equipped)
Check primary control safety
switch.
Power Check boiler disconnect switch
and main disconnect switch.
Jump the FF terminals on
Cad Cell
primary control, if the burner
starts, fault is in detector circuit.
Check resistance across cad cell.
Check for line voltage between
Primary
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.
When checking burner adjustments always use instruments.
CAUSES
Thermostat set too low.
Thermostat on "off "or "cool."
Open thermostat wires.
Loose thermostat connectors.
Faulty thermostat.
Thermostat not level.
Burner motor tripped on
overload.
Primary tripped on safety.
Switch open.
Tripped breaker or blown fuse.
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.
REMEDY
Turn thermostat up.
Switch to heat.
Repair or replace wires.
Tighten connection.
Replace thermostat.
Level thermostat.
Push reset button.
Reset safety switch.
Close switch.
Reset breaker or replace fuse.
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.