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100,000 Btu/Hr
PROPANE CONSTRUCTION HEATER
TROUBLESHOOTING
Note: For additional help, visit DESA
International's Technical Service web
site at www.desatech.com.
OBSERVED FAULT
Fan does not turn when heater is
plugged in.
Heater will not ignite
Heater shuts down while running.
WARNING: Never service heater while it is plugged in, connected to
propane supply, operating, or hot. Severe burns and electrical shock can
occur.
POSSIBLE CAUSE
1. No electrical power to heater
2. Fan hitting inside of heater shell
3. Fan blades bent
4. Defective motor
1. User did not follow installation or
operation instructions properly
2. No spark at ignitor. To test for spark,
follow step 8 under Ignitor, page 8. If
you see spark at ignitor, have heater
serviced by qualified service person.
If no spark seen:
A) Loose or disconnected ignitor wire
B) Wrong spark gap
C) Bad ignitor electrode
D) Bad spark transformer
1. Propane supply may be inadequate
2. High surrounding air temperature
causing thermal limit device to shut
down heater.
3. Restricted air flow
4. Damaged fan
5. Excessive dust or debris in surrounding
area
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REMEDY
1. Check voltage to electrical outlet. If voltage is
good, check heater power cord for breaks.
2. Adjust motor/fan mount to keep fan from hitting
inside of heater shell. Bend fan mount if necessary.
3. Replace fan. See Fan, page 7.
4. Replace motor. See Motor, page 7.
1. Repeat installation and operation instructions. See
Installation, page 4 and Operation, page 5.
2. A) Check ignitor wire. Tighten or reattach loose
ignitor wire. See Figure 10, page 8 for ignitor wire
location.
B) Set gap between ignitor electrode and target
plate to .13"/.15".
C) Replace ignitor electrode. See Ignitor, page 8.
D) Replace spark transformer. See Spark
Transformer, page 8.
1. A) Refill tank.
B) Provide additional and/or larger tanks. See
Propane Supply, page 4.
2. This can happen when running heater in
temperatures above 85 F. Run heater in cooler
temperatures.
3. Check heater inlet and outlet. Remove any
obstructions.
4. Replace fan. See Fan, page 7.
5. Clean heater. See Maintenance, page 5.
WARNING: Use only in areas free of
high dust content.
6
102370-01H
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