Installation Guide
 Rev 07/20/16 #730021
  Symptom   Problem   Solution
If you are uncomfortable working with electricity, running electrical supply 
wire or installing a circuit breaker, please consult a licensed electrician.
TROUBLESHOOTING CHART
©2016 Cadet Printed in USA 
Heater doesn’t 
work at all.
1. Supply connections are 
loose.
2. Heater has tripped one of 
its high-temperature safety 
shutoffs.
3. Heater has tripped its 
secondary high-temperature 
safety shutoff.
4. Supply circuit is faulty.
1. Turn off power at main disconnect panel. Inspect and/
or tighten all the wire connectors inside the heater and at 
any connection points inside junction boxes or at the wall 
thermostat. 
2. TO RESET: Turn power off at main disconnect panel. Allow 
20 minutes to cool. Make sure heater is not blocked and is 
clean. Restore power. If the high-temperature safety shutoff 
trips more than once a day, replace the heater.
3. Replace heater. 
4. Call a licensed electrician.
Breaker trips 
immediately 
after installing 
heater.
1. A short circuit exists in 
the electrical supply wires or 
heater wiring.
2. Circuit breaker and heater 
are not the same voltage. 
3. Circuit is overloaded.
4. Supply circuit is faulty.
1. An incorrect connection in the heater or electrical supply 
wires may cause sparking or arcing. Inspect all heater and 
electrical supply wiring insulation for damage or call an 
electrician.
2. Double check the voltage of the heater to make sure it 
matches the voltage of the circuit. Replace heater with a 
model that is 240 volts.
3. Use a lower wattage heater, or reduce the number of 
heaters on the circuit. 
4. Call a licensed electrician.
Heater blows 
cold air or 
doesn’t get 
hot.
1. Element has failed.
2. Only one side heats and 
the other side has tripped 
one of its high-temperature 
safety shutoffs (Model CST 
only).
1. Replace heater.
2. TO RESET: Turn power off at main disconnect panel. Allow 
20 minutes to cool. Make sure heater is not blocked and is 
clean. Restore power. If the high-temperature safety shutoff 
trips more than once a day, replace the heater.
Heater 
smells after 
installation 
or not being 
used.
1. Odor from element 
manufacturing process.
2. Dust or lint inside the 
heater.
3. Supply connections are 
loose.
1. On initial start-up, the heater may cause an odor due to the 
manufacturing process. It typically goes away within several 
hours.
2. Clean heater (see “MAINTAINING YOUR HEATER” on 
page 7 for instructions).
3. Turn off power at main disconnect panel. Inspect and/
or tighten all the wire connectors inside the heater and at 
any connection points inside junction boxes or at the wall 
thermostat.
Fan/motor 
doesn’t spin or 
spins slow.
1. Circuit breaker is 120 volts 
and heater is 240 volts. 
2. Defective motor or motor 
out of alignment.
1. Double check the voltage of the heater to make sure it 
matches the voltage of the circuit. Replace heater with a 
model that is 120 volts.
2. Replace motor.
Heater doesn’t 
turn off.
1. Thermostat is defective.
2. No thermostat hooked up 
to control heater.
3. Incorrect heater wattage 
for room size.
1. Replace thermostat.
2. A thermostat is required for all Com-Pak heaters. Purchase 
a built-in or wall thermostat for your heater.
3. Install higher wattage model or additional heaters if circuit 
allows.
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