www.desatech.com
118997-01B
8
TROUBLESHOOTING
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.
OBSERVED PROBLEM
Motor does not start when
heater is plugged in and ther-
mostat setting is higher than
surrounding air temperature
REMEDY
1. A) Check condition of power
cord or extension cord. Re-
pair or replace if damaged
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 11
B) Remove debris from fan
and fan guard area
C) Turn fan by hand. If fan
is hard to turn, see
Pump
,
page 13
D) See steps B and C under
item 1 above
Note:
Be sure to reset mo-
tor overload protector by
pressing reset button on
top of motor
4. Press and release flame-
out control reset button.
See Figure 3, page 5 for
button 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 13
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 out-
let with voltage lower than
120 volt
2. Loose electrical connec-
tions
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
