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Duct Heater Troubleshooting Guide
Problem
Causes
Won't Power On
Field power wires not
(no heat)
connected properly
Fuse(s) have blown or
breaker has tripped
Automatic Reset Cutout
has tripped
Manual Reset Cutout has
tripped
Air Flow Switch has
tripped
Wires have shorted out
Loose or unconnected
internal wires
Incorrect Voltage
Not Enough
Fuse(s) have blown
Heat
Failed Element(s)
Loose or unconnected
wire terminals
Incorrect Voltage
Improper sizing (kw)
Too Much Heat
Incorrect Voltage
Solution
Connect wires per the Wiring section of the Installation & Operat-
ing Manual (IOM)
Check resistance of fuses using a Multimeter to ensure continuity.
Replace any blown fuses.
Wait for 30 minutes. The Automatic Cutout should reset and the
heater should begin working again. If not, disconnect wires from
the cutout and use a Multimeter to test for continuity across the
cutout.
Shut down the heater per the Heater Shut Down section of the
Installation & Operating Manual. Open the terminal box and push
the reset button on the manual reset (near the label "PUSH TO
RESET") and start up the heater per the Heater Startup section
of the Installation & Operating Manual. If the heater still does not
function, disconnect wires from the cutout and use a Multimeter
to test for continuity across the cutout. If there is still no continuity
after pushing the button, the cutout needs to be replaced.
Ensure that adequate flow is being provided to the heater per the
Air Velocity requirements stamped on the Nameplate.
Shut down the heater per the Heater Shut Down section of the In-
stallation & Operating Manual. Open the terminal box and check
for each wire for continuity.
Shut down the heater per the Heater Shut Down section of the In-
stallation & Operating Manual. Open the terminal box and check
wire terminals for proper connection.
Check the rated voltage for the heater provided on the nameplate.
Check supply voltage & verify that it matches the nameplate.
Check resistance of fuses using a Multimeter to ensure continuity.
Replace any blown fuses.
Shut down the heater per the Heater Shut Down section of the In-
stallation & Operating Manual. Open the terminal box and use an
ohmmeter to check for resistance across each element. All coils
should have the same resistance. If the heating element is broken
there will generally be either zero or infinite resistance. Replace
any heating banks with broken coils.
Shut down the heater per the Heater Shut Down section of the In-
stallation & Operating Manual. Open the terminal box and check
wire terminals for proper connection.
Check the rated voltage for the heater provided on the nameplate.
Check supply voltage & verify that it matches the nameplate.
Verify that the heater KW provided is adequate for the applica-
tion. Ensure that the blower output, when measured downstream
of the duct heater, matches the Air Velocity requirement that is
stamped on the nameplate.
Check the rated voltage for the heater provided on the nameplate.
Check supply voltage & verify that it matches the nameplate.
13
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