Applied Air GAS-FIRED HEATERS, Installation & Operation Instruction

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Symptom Cause Remedy
1. Check power source.
2. Replace
fuse(s).
3. Close or connect customer
interlock.
4. Switch to “on” position.
5. Close door, check and/or replace
switch.
6. Check stat and settings, reset
by re-cycling the power.
Check sensor and location.
7. Check for power at damper
motor and that end switch has
been wired correctly. End
switch should be wired N.O.
(normally open). Clear
linkage.
8. Reset the starter by pushing
red button on starter, check
amp draw.
9. Turn power off and check
belts.
10. Turn power off and check
motor and wiring.
11. Check time clock and fi eld
installed controls for correct set-
tings and voltage.
12. Check night set back
thermostat for correct
settings.
13. Turn power off and check
bearings.
SECTION VII - TROUBLESHOOTING
continued
A. Supply fan(s) do not
operate.
1. Low or no voltage.
2. Fuse(s)
blown.
3. Customer’s interlock not
closed or connected.
4. Fan “on-off” switch in
“off”
position.
5. Door switch open.
6. Freeze protection tripped.
7. Damper motor not operating,
its end switch not making, or
dampers binding.
8. Overload protection on
motor starter tripped.
9. Belts loose or broken.
10. Motor may be burned or
incorrectly
wired.
11. Time clock or fi eld installed
controls not closed.
12. Night set back thermostat
not
closed.
13. Bearing seized on shaft.