Troubleshooting - Desa SB350D Owner's Manual

TROUBLESHOOTING

Note: For additional help, visit DESA
International's Technical Service web
site at www.desatech.com.
OBSERVED PROBLEM
Motor does not start when heater is plugged
in and thermostat setting is higher than
surrounding air temperature
106029
WARNING: Never service heater while it is plugged in, operating, or
hot. Severe burns and electrical shock can occur. Only a qualified service
person should service and repair heater.
POSSIBLE CAUSE
1. No power or low voltage at heater due to:
A) Damaged power cord or extension
cord
B) Wrong size extension cord
C) Heater plugged into outlet with volt-
age lower than 120 volt
2. Loose electrical connections
3. Motor overload protector tripped due to:
A) Dirty fan
B) Debris pulled into fan area by fan
C) Binding pump
D) Low voltage
4. Flame-out control not reset
5. Damaged flame-out control
6. Damaged power relay
7. Damaged thermostat
8. Binding pump
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7
OWNER'S MANUAL
REMEDY
1. A) Check condition of power cord or
extension cord. Repair or replace if dam-
aged
B) Use extension cord with proper wire
size (see To Start Heater, page 5)
C) Make sure heater is plugged into 120
volt/60 hertz outlet
2. Check connections. Tighten if loose
3. A) See Fan Blades and Air Deflectors,
page 10
B) Remove debris from fan and fan
guard area
C) Turn fan by hand. If fan is hard to
turn, see Pump, page 11
D) See steps B and C under item 1 above
Note: Be sure to reset motor overload
protector by pressing reset button on top
of motor
4. Press and release flame-out control re-
set button. See Figure 4, page 5 for but-
ton location
5. Replace flame-out control
6. Replace power relay
7. Replace thermostat
8. Turn fan by hand. If fan is hard to turn,
see Pump, page 11
Continued