Desa H.S.I. Series Owner's Manual page 6

TROUBLESHOOTING
6
TROUBLESHOOTING
WARNING: Never service heater while it is plugged
in, operating, or hot. Severe burns and electrical
shock can occur.
FAULT CONDITION
Motor does not start five seconds after
heater is plugged in
Motor starts and runs but heater does not
ignite
Heater ignites but ignition control as-
sembly shuts heater off after a short
period of time
POSSIBLE CAUSE
1. No power to heater
2. If equipped, thermostat setting is too low
3. Bad electrical connection between mo-
tor and ignition control assembly or ig-
nition control assembly and power cord
4. Binding pump rotor
5. Defective ignition control assembly
6. Defective motor
7. Blown fuse or ignitor control assembly
1. No fuel in tank
2. Pump pressure incorrect
3. Dirty fuel filter
4. Obstruction in nozzle
5. Water in fuel tank
6. Bad electrical connection between igni-
tor and ignition control assembly
7. Defective ignitor
8. Defective ignition control assembly
1. Pump pressure incorrect
2. Dirty air intake, air output, and/or lint
filter
3. Dirty fuel filter
4. Obstruction in nozzle
5. Photocell assembly not properly in-
stalled (not seeing the flame)
6. Dirty photocell lens
7. Bad electrical connection between pho-
tocell and ignition control assembly
8. Defective photocell
9. Defective ignition control assembly
For more information, visit www.desatech.com
For more information, visit www.desatech.com
REMEDY
1. Check circuit breaker in electrical panel
2. Turn thermostat knob to a higher setting
WARNING: High voltage!
3. Check all electrical connections. See
Wiring Diagrams, page 12
4. If fan does not turn freely, see Pump Ro-
tor, pages 10 and 11
5. Replace ignition control assembly
6. Replace motor
7. See Ignition Control Assembly, page 11
1. Fill tank with kerosene
2. See Pump Pressure Adjustment, page 8
3. See Fuel Filter, page 8
4. See Nozzle Assembly, pages 9 and 10
5. Drain and flush fuel tank with clean
kerosene. See Storing, Transporting, or
Shipping, page 5
WARNING: High voltage!
6. Check electrical connections. See Wir-
ing Diagrams, page 12
7. Replace ignitor, see pages 8 and 9
8. Replace ignition control assembly
1. See Pump Pressure Adjustment, page 8
2. See Air Output, Air Intake, and Lint Fil-
ters, page 7
3. See Fuel Filter, page 8
4. See Nozzle Assembly, pages 9 and 10
5. Make sure photocell boot is properly
seated in bracket
6. Clean photocell lens
WARNING: High voltage!
7. Check electrical connections. See Wir-
ing Diagrams, page 12
8. Replace photocell
9. Replace ignition control assembly
112846-01A