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5.0
Troubleshooting Guide
5.0
Troubleshooting Guide
Turn up thermostat.
Does the fan
No
blower turn on?
Find the source of the electrical problem between panel and heater.
.
Find the source of the
electrical problem
between panel and
external transformer.
External transformer
is faulty and must be
replaced.
Yes
Repair the wiring
between the trans-
former and the 24V
terminal plug.
Does the ignitor
No
warm up and
glow orange?
Yes
Continued on page 58
Is the power at the
heater 120V?
No
Is there 120V on the
No
primary side of the
external transformer?
Yes
Is there 24V on the
No
secondary side of the
external transformer?
Is there 24V on
the secondary
Yes
side of the
transformer?
No
Replace transformer.
Is the ignitor
physically
No
damaged?
Yes
Replace ignitor.
No
Does the heater have a relay board?
Yes
(identified with orange crescent
next to the terminal plug).
Is the power across
No
the left and middle
terminals of the
24V plug 24 volts?
Is there
Yes
24V to the
thermostat?
No
Find source of electrical problem between
the external transformer and thermostat.
Is there 120V on
the primary side
Yes
of the internal
transformer?
No
Repair the wiring between power in and transformer.
Check voltage at ignitor
sequence (usually 5 to 15
seconds after power to
heater). Is it 120V?
Yes
Is the resistance through the
ignitor 50-400 Ω?
56
HL2
Series
Yes
24 Volts
The thermostat or wiring
Yes
is faulty and should be
replaced or repaired.
Is the power across the
left terminal of the 24V
plug and ground (screw
No
on the burner control
box) 24 Volts?
Is the inlet or the outlet
No
of the unit plugged or
obstructed?
Yes
Remove obstruction.
No
Yes
No
Yes
No
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