2-506.14
TROUBLESHOOTING
Problem
Possible cause(s)
Remedy
Unit does not operate
1. Electric circuit in open position
1. a. Turn on switch or move thermostat
to higher setting.
b. Replace fuse or reset disconnect switch
2. Blown fuses in control
2. Replace fuses
compartment.
3. Defective or incorrect wiring
3. Check wiring and connections. Refer to
diagram inside junction box
4. Defective thermostat or switch
4. Check continuity with volt-ohmeter.
Replace defective part if necessary
5. Defective or burned out control
5. Check secondary voltage with
transformer
voltmeter. Replace if necessary
Fan operates but
1. Power interrupted by overheat
1. a. Not enough air volume over elements.
element does not heat
control
Louvers must be opened at least 45°.
Clean element screen and spiral fins.
b. Check motor rpm against nameplate
rating. Replace motor if speed too slow.
c. Defective limit control. Check wiring
and connections. check continuity
through control. Replace if necessary.
2. Summer-winter switch in
2. Change switch position
summer position
3. Defective or incorrect wiring
3. Check all wiring and connections. See
diagram inside junction box.
4. Blown element fuses
4. Replace element fuses
Elements heat but fan
1. Fan motor failure
1. a. Check for loose electrical connections.
does not operate
Check wiring with diagram in control
compartment
b. Repair or replace defective motor.
c. Voltage too high or too low.
Check voltage with volt-meter.
2. Summer-winter switch defective
2. Check for continuity with volt-ohmeter.
or improperly wired
Replace if necessary.
3. Defective or incorrect wiring
3. Check all wiring and connections. See
diagram inside junction box
Insufficient heat
1. Too few units for heat loss
1. Add more units or increase size of units
2. Unit mounted too high
2. Lower mounting height
3. Fan operates backwards
3. Repair or replace motor or reverse fan
rotation
4. Burned out (elements)
4. Disconnect internal wiring and check
element resistance with ohmeter
Table 11.1 – Troubleshooting
11
