70,000 Btu/Hr H.S.I. Series
PORTABLE FORCED AIR HEATERS
TROUBLESHOOTING
Note: For additional help, visit DESA International’s technical service web site at www.desatech.com.
WARNING: Never service heater while it is plugged in, operating, or hot. Severe burns and electrical shock can occur.
FAULT CONDITION | POSSIBLE CAUSE | REMEDY | |
Motor does not start five seconds after heater | 1. No power to heater | 1. Check circuit breaker in electrical panel | |
is plugged in |
|
|
|
| WARNING: High voltage! |
| |
|
|
| |
|
|
|
|
2.Bad electrical connection between mo- tor and ignition control assembly or ig- nition control assembly and power cord
3.Blown fuse on ignition control assembly
4.Binding pump rotor
5.Defective ignition control assembly
6.Defective motor
2.Check all electrical connections. See Wiring Diagram, page 11
3.See Ignition Control Assembly, page 8
4.If fan does not turn freely, see Pump Rotor, page 10
5.Replace ignition control assembly
6.Replace motor
Motor starts and runs but heater does not ignite
1.No fuel in tank
2.Pump pressure incorrect
3.Dirty fuel filter
4.Obstruction in nozzle
5.Water in fuel tank
1.Fill tank with kerosene
2.See Pump Pressure Adjustment, page 7
3.See Fuel Filter, page 8
4.See Nozzle Assembly, page 9
5.Drain and flush fuel tank with clean kerosene. See Storing, Transporting, or Shipping, page 5
WARNING: High voltage!
6. | Bad electrical connection between igni- | 6. | Check electrical connections. See Wir- |
| tor and ignition control assembly |
| ing Diagram, page 11 |
7. | Defective ignitor | 7. | Replace ignitor, see page 8 |
8. | Defective ignition control assembly | 8. | Replace ignition control assembly |
Heater ignites but ignition control assembly shuts heater off after a short period of time
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)
1.See Pump Pressure Adjustment, page 7
2.See Air Output, Air Intake, and Lint Fil- ters, page 7
3.See Fuel Filter, page 8
4.See Nozzle Assembly, page 9
5.Make sure photocell boot is properly seated in bracket
WARNING: High voltage!
6. | Dirty photocell lens | 6. | Clean photocell lens |
7. | Bad electrical connection between pho- | 7. | Check electrical connections. See Wir- |
| tocell and ignition control assembly |
| ing Diagram, page 11 |
8. | Defective photocell | 8. | Replace photocell |
9. | Defective ignition control assembly | 9. | Replace ignition control assembly |
www.desatech.com
6 | 103685 |
