52
CL3
Series
5.0
Maintenance
•
Troubleshooting Guide
5.0
Maintenance
Turn up thermostat.
Does the fan
blower turn on?
Is the power at the
heater 120 V?
Find the source of the electrical problem between panel and heater.
No
Is the power
across the left
terminal of the
24 V plug and
ground 24 V?
Is there 120 V on
the primary side
of the internal
transformer?
Is there 24 V
on the second-
ary side of the
transformer?
Replace transformer.
Repair the wiring
between the
transformer and
the 24 V
terminal plug.
Repair the wiring between
power in and transformer.
Yes
No
Yes
No
Yes
Yes
Does the igniter
warm up and
glow red?
Is the igniter
physically
damaged?
Replace igniter.
Check voltage at igniter
sequence (usually 5 to 15
seconds after power to
heater). Is it 120 V?
Is the resistance through
the igniter 50-400
Ω
?
Is the inlet or the outlet
of the unit plugged or
obstructed?
Remove obstruction.
No
Yes
Yes
No
No
No
Yes
Yes
No
Continued on page 55
Does the switch
light energize?
Yes
No
Is the green light burnt out?
If so, replace.
No
No
Is the inlet or the outlet
of the unit plugged or
obstructed?
No
No
Yes
Key
Start
Question
Process
Question
Corrective
Action
